Toyotomi KURO Mini Service Manual
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Toyotomi KURO Mini Service Manual

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Mini Service Manual
v.2-2020

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Summary of Contents for Toyotomi KURO

  • Page 1 Mini Service Manual v.2-2020...
  • Page 3 KURO IZURU HIRO FLOOR STANDING...
  • Page 4 Error Code List Applicable model: SPLIT TYPE and FLOOR STANDING Display method of indoor unit Malfunction Indicator display AC status Possible causes Error name Power Cool Heat code indicator indicator indicator Flash Malfunction of The complete unit stops operation 1. Jumper cap is not installed in control panel; jumper cap 2.
  • Page 5 Display method of indoor unit Malfunction Indicator display AC status Possible causes Error name Power Cool Heat code indicator indicator indicator Flash Liquid valve 1. Temperature sensor is not well connected or damaged; (refer temperature to Page 69 “Table 2”) times sensor is ON / 2.
  • Page 6 Display method of indoor unit Malfunction Indicator display AC status Possible causes Error name Power Cool Heat code indicator indicator indicator Flash 5 Outdoor air Complete unit stops operation; 1. The exhaust temperature sensor is not connected well or times discharge motor of sliding door is cut off damaged.
  • Page 7 Display method of indoor unit Malfunction Indicator display AC status Possible causes Error name Power Cool Heat code indicator indicator indicator Flash Module Cool: compressor stops 1. Air inlet / air outlet of outdoor unit are blocked by filth or dirt; overheating operation, while indoor fan 2.
  • Page 8 Display method of indoor unit Malfunction Indicator display AC status Possible causes Error name Power Cool Heat code indicator indicator indicator Evaporator Not error code, it is the status code in cooling process anti-freezing protection Anti cold air Not error code, it is the status code in heating process protection Flash Defrosting...
  • Page 9 Flow Chart of Troubleshooting for Main Malfunctions 1. Troubleshooting for jumper cap Main check points: (1) jumper cap (2) control board of indoor unit Display shows “C5” Check whether the main Insert the equipped board of controller is inserted with jumper cap jumper cap.
  • Page 10 2. Communication malfunction 2.1 Communication error of indoor and outdoor unit Main check points: (1) Connection wire between indoor unit and outdoor unit (2) Wiring inside the unit (3) Communication circuit of control board of indoor unit (4) Communication circuit of control board of outdoor unit Start Check whether the unit has operated normally before...
  • Page 11 2.2 Communication error between wired controller and indoor unit Main check points: (1) Connection wire of wired controller (2) Wiring terminal (3) Wired controller (4) Main board of indoor unit Start Check whether the Connect the wired controller and connection wire of wired controller indoor unit correctly according to and main board of the indoor the circuit diagram firmly...
  • Page 12 3. IPM protection , over-phase current of compressor Main check points: (1) compressor COMP terminal (2) power supply voltage (3) compressor (4) charging amount of refrigerant (5) air inlet and air outlet of indoor/outdoor unit NOTE:The control board as below means the control board of outdoor unit. Put through the power and turn on the unit...
  • Page 13 4. Overload protection of compressor , high discharge temperature protection of compressor 4.1 Overload protection of compressor, high discharge temperature protection of compressor (split type and floor standing unit) Main check points: (1) electronic expansion valve (2) expansion valve terminal (3) charging amount of refrigerant (4) overload protector NOTE:The control board as below means the control board of outdoor unit.
  • Page 14 4.2 Overload protection (window type, TTW, PTAC, portable type, recreational vehicle AC and dehumidifier) Main check points: (1) Compressor (2) Refrigerant (3) Whether the air inlet/outlet, heat exchanger and internal system is dirty and blocked (4) Fan (5) Main board Start Heat exchanger is too dirty, Clean the heat exchanger...
  • Page 15 5.Troubleshooting for temperature sensor Troubleshooting for Temperature and humidity sensor 5.1Temperature sensor error Main check points: (1) connection terminal (2) temperature sensor (3) main board Start Check whether the connection terminal between the temperature sensor and the control board is loose or not connected well.
  • Page 16 5.2 Malfunction of temperature and humidity sensor (dehumidifier) Main check points: (1) connection terminal (2) inspection board (3) control board Start Check if the connection terminal between the Insert the inspection inspection board and control board board is loose or not connected well Eliminate malfunction...
  • Page 17 6.High temperature prevention protection ; high power ; system is abnormal 6.1 High temperature, overload, high power and abnormal system Main check points: (1) outdoor temperature (2) fan (3)air inlet and air outlet of indoor/outdoor unit NOTE:The control board as below means the control board of outdoor unit. Overload protection, high temperature prevention protection...
  • Page 18 6.2 Overload (window type, TTW, PTAC, portable type and recreational vehicle AC) Main check points ： (1) compressor (2) refrigerant (3) air inlet/outlet, heat exchanger and internal system is dirty and blocked (4) fan (5) operation environment Start The air conditioner should operate under low ambient Operation environment is...
  • Page 19 7.Desynchronization diagnosis for compressor Main check point: (1) system pressure (2) power supply voltage NOTE:The control board as below means the control board of outdoor unit. Desynchronization occurs Desynchronization occurs during operation after turning on the unit Check whether the fan Replace the fan Does the outdoor fan operate terminal OFAN is...
  • Page 20 8.Malfunction diagnosis for failure startup Main check points: (1) compressor wire (2) compressor (3) charging amount of refrigerant NOTE:The control board as below means the control board of outdoor unit. Put through the power and turn on the unit The time for stop operation is not enough and the system's high pressure and low pressure is Check whether the compressor unbalanced.
  • Page 21 9. Charging malfunction of capacitor Main check points: (1) wiring board XT (2) reactor NOTE:The control board as below means the control board of outdoor unit. Put through the power to turn on the unit and then wait for 1min Measure the voltage at both ends of electrolytic capacitor with DC voltmeter.
  • Page 22 10. Troubleshooting-motor(indoor fan) doesn't operate Main check points: (1) connection terminal (2) motor (3) control board AP1 of indoor unit (4) blade 10.1 DC motor Display shows "H6" Pull the blade with hand under de-energization status Check whether the Adjust the motor and the blade blade operates smoothly to make the motor operate smoothly.
  • Page 23 10.2 PG motor Display shows "H6" Pull the blade with hand under de- energization status Adjust the motor and Check whether the blade to make the the blade operates blade operate smoothly smoothly. Eliminate malfunction Check whether Insert the feedback the feedback terminal of terminal again indoor fan's motor...
  • Page 24 11. AC overcurrent protection Start The normal fluctuation is about 10% of rated Eliminate malfunction The power voltage is unstable. voltage on the nameplate. The power voltage is too low and the Adjust the power voltage to make it normal. Eliminate malfunction load is too high.
  • Page 25 12. Electrical heating operation error (window type) / relay adhesion error (PTAC) 12.1 Electrical heating operation error (window type) Main check points: (1) electrical heating tube (2) main board (3) wiring method Start Inspect and conduct wiring again Wrong wiring? by referring to the wiring diagram Eliminate malfunction...
  • Page 26 12.2 Relay adhesion error (PTAC) Main check points: (1) wiring diagram (2) main board Start Check if the wiring Energization test connection and insertion is normal Eliminate malfunction Connect and insert wiring again according to the wiring diagram Energization test Replace with a new controllerwith the same model...
  • Page 27 13. Current imbalance error (PTAC) Main check points: (1) wiring (2) main board Start Check if the wiring Energization test connection and insertion is normal? Eliminate malfunction Connect and insert wiring again according to the wiring diagram Check each ports of electrical heating Energization test and the insulation resistance of unit casing to see if they are...
  • Page 28 14. Combination method of electrical heating is incorrect Main check points: (1) wiring (2) main board (3) power cord Start Check if the wiring Energization test connection and insertion is normal Eliminate malfunction Connect and insert wiring again according to the wiring diagram Check if the jumper wire of Energization test power cord connector is correct...
  • Page 29 15. Operation current of electrical heating is abnormal Main check points: (1) wiring (2) main board (3) electrical heating Start Check if the wiring Energization test connection and insertion is normal Eliminate malfunction Connect and insert wiring again according to the wiring diagram Measure the resistance of Energization test each electrical heater to see if it’s...
  • Page 30 16. Circuit of temperature limiter is disconnected Main check points: (1) wiring (2) main board (3) electrical heater Start Check if the wiring Energization test connection and insertion is normal Eliminate malfunction Connect and insert wiring again according to the wiring diagram Measure the resistance of each Energization test electrical heater to see if it’s normal...
  • Page 31 17. Troubleshooting on full water protection (portable type), flashing full water light (dehumidifier) Main check points: (1) Structural parts of water tank switch (2) Connection wire of liquid level switch (3) Component of liquid level switch (4) Main board Start Unplug the rubber plug / pour the Full water in water tank water out from the water tank...
  • Page 32 18. Water pump protection error (dehumidifier) Main check points: (1) Water inlet/outlet of water pump (2) Water pump component and connection wire (3) Component of liquid level switch (4) Main board Start Clean the water inlet/outlet Water inlet/outlet is blocked Eliminate malfunction Wire connection...
  • Page 33 Table 1. Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor Units(15K) Resistance Resistance Resistance Resistance Temp. Temp. Temp. Temp. kΩ kΩ kΩ kΩ 138.10 49.02 18.75 7.97 128.60 44.31 17.14 7.35 115.00 40.09 15.68 6.79 102.90 36.32 14.36 6.28 92.22 32.94...
  • Page 34 Table 4. Resistance Table of Temperature and Humidity Sensor and Ambient Temperature Sensor (100K) Resistance Resistance Resistance Resistance Temp. Temp. Temp. Temp. kΩ kΩ kΩ kΩ 357.92 124.96 53.14 829.26 293.06 114.22 49.04 743.64 265.56 104.51 45.30 667.69 240.87 95.71 41.88 600.20 218.68...
  • Page 35 Table 6 . Torque table of connection Table 7. Connection pipe table: pipe: Max. length of Max. External Torque Cooling capacity connection drop diameter(mm) (N.m) pipe 15~20 Φ6(1/4") 5000Btu/h（1465W） 30~40 Φ9.52(3/8") 7000Btu/h（2051W） 45~55 Φ12(1/2") 9000Btu/h（2637W） 60~65 Φ16(5/8") 12000Btu/h（3516W） 70~75 Φ19(3/4") 18000Btu/h（5274W）...
  • Page 37 NOBORU SATORI...
  • Page 38 Error Code...
  • Page 39 （1）E1- internal temperature sensor error Cause: The detection of short circuit or open circuit of internal temperature sensor during the inspection of main control panel in the Explanation of internal machine, indicated by “internal temperature sensor error”. error Inspection path: Sensor→Sensor wire→Connectors→Main internal control panel Tools required Multimeter, 15KΩ...
  • Page 40 （2）E2 -external coil sensor error Cause: The detection of short circuit or open circuit of external coil sensor during the inspection of main external control panel, indicated Explanation of by “external coil sensor error”. error Inspection path: Sensor→Sensor wire→Connectors→Main external control panel Tools required Multimeter, 20KΩ...
  • Page 41 （3）E3 -internal coil sensor error Cause: The detection of short circuit or open circuit of internal coil sensor during the inspection of main internal control panel, indicated Explanation of by “internal coil sensor error”. error Inspection path: Sensor→Sensor wire→Connectors→Main internal control panel Tools required Multimeter,, 5KΩ...
  • Page 42 （4）E4 -Internal fan error of wall mounted air conditioner（PG motor） Cause: PG motor is equipped with speed feedback signal line. When the feedback signal of speed is not received by the main internal control panel, it has no way to recognize the rotating speed of motor, which will be indicated as “Internal fan error”.
  • Page 43 (5) E4- Internal fan error of wall mounted air conditioner (DC motor) Cause: The internal fan of some highly energy efficient models is DC motor using a green plug through which the main internal control panel can drive the motor and sense the current rotational speed feedback. When the main internal control panel cannot receive the rotational speed feedback signal of the motor, it will indicate “DC motor error”.
  • Page 44 (6) E4- Sliding door error of floor standing Cause: For the model with upper and lower sliding doors, the position of trap door is sensed via the upper and lower photoelectric switches. When the sliding door closes, it will move upward until the upper photoelectric switch senses the sliding door;...
  • Page 45 (7) E5(5E) -Internal and external communication error Cause: frequency converter needs internal external communication.When the communication cannot be reached, the internal and external units will indicate “internal and external communication error”. Only “main internal control panel, connecting cable and main external control panel”...
  • Page 46 (8) F0- External DC fan error (3-core terminal motor) Cause: Our frequency changing external unit uses the 3-lead-wire DC motor, or “externally driven DC motor” for short, after 2012. It has no speed feedback circuit but 3 drive lead wires and its driving principle is Explanation of similar to that of the compressor.
  • Page 47 (9) F1 -Module protection error Cause: The power module is the part to directly drive the compressor to work. It can protect the machine in time when overcurrent, overvoltage or overheat occurs and stops the compressor from working. It will, at the same time, send “shutdown request” to the Explanation of module panel.
  • Page 48 (10) F2- PFC protection error Cause: PFC board is a component of the inverter air conditioner for power factor correction and voltage boosting. When the PFC board cannot perform power calibration as normal because of overcurrent and Explanation of overvoltage, it will indicate “PFC protection error” and its function error may also be integrated with the module panel or main control panel.
  • Page 49 (11) F3- Compressor out-of-step error Cause: The module panel will constantly test the current of lead wires of the compressor and calculate the position of the rotator of the compressor when driving the compressor to work. When the compressor deviates far from the normal operating status , it will indicate “compressor out-of-step error”...
  • Page 50 (12) F4- Exhaust sensor error Cause: The main external control panel will indicate “exhaust sensor error” and send it to the main internal control panel when it detects Explanation of short circuit or open circuit of the exhaust sensor. error Inspection path: Exhaust sensor→Sensor wire→Connectors→Main external control panel Tools required...
  • Page 51 (13) F5 -Compressor top head sensor error Cause: The compressor top head sensor is a compressor top head temperature protection switch most of the time. It keeps closed (short circuit) when the compressor temperature is normal and switches off Explanation of (open circuit) when the temperature is too high.
  • Page 52 （14）F6- external temperature sensor error Cause: The detection of short circuit or open circuit of external termperature sensor during the inspection of main external control Explanation of panel, indicated by "external termperature sensor error". error Inspection path: Sensor→Sensor wire→Connectors→Main external control panel Tools required Multimeter, 15KΩ...
  • Page 53 （15）F7-OVP or UVP error Cause: All the inverter air conditioners are equipped with voltage inspection circuits, but differnt models of machines have differnt locations for the voltage inspection (on the modue panel or main external control panel). When the supply voltage is lower than 135V or Explanation of higher than 275V, the inspectio circuit would detect over or under voltage protection signal and send it to the main external control panel...
  • Page 54 （16）F8-main external control panel and module panel communication error （exclusive of external machine of single panel） Cause: Only the models with the module panels separated with the main external control panels may have this error. When the machine is running normally, the module panel and the main external control panel would coordinate with each other on the communication to work Explanation of and when the communication is off, the main external control panel...
  • Page 55 （17）F9- outdoor EE error Cause: Many parameters need to be preset for the running of the external unit of the air conditioner and such parameters are placed in a data storage 8-feet chip, which is called "EEPROM" or "EE" for short. The motor on the main external control panel can only work after reading the data stored in EE and if not read, the alarm "outdoor EE Explanation of...
  • Page 56 （18）FA- recirculated sensor error (only models of electronic expansion valves are involved) Cause: The recirculated sensors are only used on machine models of electronic expanssion valves and the back temperature value is considered as the basis for adjustment of the electronic expanssion valve and determination if the four-way valve changes the position Explanation of normally during heating.
  • Page 57 （19）Function protection prompt of frequency conversion external machine Cause: In the regular running of the air conditioner, for some nonfaulted status, it may need the compressor to shut down or limit or lower the frequency so as to protect the normal operating of the entire cooling system (eg.
  • Page 58 P1-Water full alarm Error code Error LED1 Light phenomenon LED light signal of LED2 Light external panel LED3 Cause: 1. The unit storage tank is full of water; 2. The float switch is abnormally disconnected; 3. The main control board is abnormal. Explanation of Inspection path: error...
  • Page 59 P2-High voltage switch protection（PE: High voltage switch error） Error code Error LED1 phenomenon LED light signal of LED2 Light external panel LED3 Light Cause: In the standby state or when the unit is running, the high-voltage switch is open, reaching 3 times (within 20 minutes), and Explanation of it will report “high-voltage switch protection”;...
  • Page 60 P3- Fluoride deficiency protection Error code Error LED1 phenomenon LED light signal of LED2 Flash external panel LED3 1. System lack of fluoride 2. The valve is not open 3. Capillary blockage Frequent 4. Internal and external coil temperature sensation abnormally problematic part 5.
  • Page 61 P4 Outside dish prevent overload protection (refrigeration) Solution: 1. Check whether the condensing pressure is over high nor not. 2. Problem comes from the damaged outdoor coil temp. sensor if the condensing pressure is normal, solution is to replace the sensor probe accordingly. 3.
  • Page 62 P6- High temperature protection in heating room Error code Error LED1 phenomenon LED light signal of LED2 external panel LED3 Frequent Internal coil sensor problematic part 1. Check whether the indoor air inlet is blocked. If the air inlet is affected, remove the shielding.
  • Page 63 P7- Indoor anti-freeze protection during cooling Error code Error LED1 phenomenon LED light signal of LED2 external panel LED3 Cause: When the indoor and outdoor temperatures are too low, or the indoor unit is dirty, the evaporation temperature is lower than 0 °C Explanation of during cooling, and will reporte indoor anti-freeze protection.
  • Page 64 P8-Outdor unit overcurrent protection error lock Error code Error LED1 phenomenon LED light signal of LED2 external panel LED3 Cause: The operating current value of the unit exceeds the protection value set when the unit is running, and the unit reports the “Outdor unit Explanation of overcurrent protection error lock”...
  • Page 65 L0- Dc overvoltage error Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Explanation of error Cause: Voltage too low or too high, or suddenly change of voltage Frequent ODU PCB board problematic part 1.
  • Page 66 L1- Compressor Phase current overcurrent protection L2- Compressor Lost step protection Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Cause: ODU PCB board broken, voltage too low or too high, or Explanation of error suddenly change of voltage, connecting wire is broken, compressor issue Frequent...
  • Page 67 L3- Compressor phase error Error code L0（Compressor phase error） LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Explanation of error Cause: mainly because the compressor wire wrongly connected Frequent Compressor wire. problematic part 1. Check if the compressor wire conmected wrongly. 2.
  • Page 68 L4-Compressor drive module IPM fault Error code L0（Dc overvoltage error） LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Explanation of error Cause: mainly because the compressor wire wrongly connected Frequent Supply voltage, compressor wire, system pressure, external main control panel, compressor problematic part 1.
  • Page 69 L5- PFC overcurrent hardware protection L6- PFC overcurrent software protection L7- Current detection AD abnormal protection LC- PFC current detection AD abnormal protection Ld- Dc fan motor detection AD abnormal protection Error code Error phenomenon LED1 Flash LED light signal of LED2 Flash external panel...
  • Page 70 L8- shunt Resistance imbalance fault Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Cause: ODU PCB board broken, connecting wire broken or Explanation of error connected loose, compressor issue Frequent Supply voltage, connecting wire, system pressure, module panel, main external control panel, compressor problematic part 1.
  • Page 71 L9- IPM temperature sensor error Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Cause: ODU PCB board broken, Wind speed of external fan is Explanation of error abnormal, high system pressure Frequent system pressure, main external control panel, external fan problematic part 1.
  • Page 72 LA- Compressor startup failure Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Cause: ODU PCB board broken, connecting wire broken or Explanation of error connected loose, compressor issue Frequent Supply voltage, connecting wire, system pressure, module panel, main external control panel, compressor problematic part 1.
  • Page 73 LE- DC fan motor phase error LF- DC fan motor Lost step protection Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Cause: ODU PCB board broken, voltage too low or too high, plug Explanation of error too loose, module error, DC fan error Frequent...
  • Page 74 LH- DC fan motor IPM protection Error code LED1 Flash Error phenomenon LED light signal of LED2 Flash external panel LED3 Light Cause: ODU PCB board broken, voltage too low or too high, The Explanation of error connecting wire is broken, module panel error, the condenser is blocked.
  • Page 75 Console DC Inverter Funzione Wi-Fi...
  • Page 76 CONSOLE MODELS...
  • Page 77 Protection for outdoor fan motor malfunction (outdoor fan is blocked or not connected-if there are two outdoor fans, L3 stands for fan motor 1 and LA stands for fan motor 2) Protection for DC fan motor malfunction/outdoor fan motor malfunction (outdoor fan is blocked or not connected-if there are two outdoor fans, L3 stands for fan motor 1 and LA stands for fan motor 2)
  • Page 78 Start the troubleshooting for temperature sensor Check whether the temperature sensor and wiring terminal is loosened or poorly connected? Insert the temperature sensor well Is mafunction eliminated? Check whether the Replace temperature with temperature sensor is normal by the same mode refering the resistance value of temperature sensor Is mafunction eliminated?
  • Page 79 Communication malfunction for some indoor unit Disconnect the power, and check connection wire for indoor and outdoorunits and wires inside electric box areconnected correctly Connect wires according to wiring Is malfunction Wires are connected eliminate? diagram correctly? De-energize the unit, exchange the communication wirefor the indoor unit with normal communication and the indoor unit with malfunction, energize the unit and thenwait for 3mins...
  • Page 80 All indoor units alarms communication malfunction Disconnect the power, and check connection wire for indoor and outdoor units and wires inside electric box are connected correctly Connect wire Wires are connectly according connected correctly? Is malfunction eliminated? to wiring diagram Disconnect the power, and check whether theconnection wires between mainboard of outdoorunit and filter palte are connected...
  • Page 81 Display displays C5 Check whether the Insert the jumper mainbaord ofcontroller is inserted with thejumper cap? Is malfunction eliminated? Check Re-insert the jumper whether the jumper cap is poorly connected? Is malfunction eliminated? Replace the jumper Is malfunction eliminated? It's the malfunction of mainboard, replacethe mainboard...
  • Page 82 Start the troubleshooting for H6 malfunction Check whether the terminal of DC motor is connected tightly Insert the motor terminal tightly Is mafunction eliminated? Pull blade with hand to see whether it can rotate smoothly Re-assemble blade and motor correctly Is mafunction eliminated? Energize the unit and turn on the unit.
  • Page 89 Sistemi Multi Split...
  • Page 90 Service Manual 9. Maintenance MFMR32-14-18-21-24-28kBTU 9.1 Precautions before Performing Inspection or Repair There are high-capacity electrolytic capacitors on the outdoor mainboard. Thus, even the power is cut off, there is high voltage inside the capacitors and it needs more than 20min to reduce the voltage to safety value. Touching the electrolytic capacitor within 20min after cutting the power will cause electric shock.
  • Page 91 Service Manual 9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement 1. Requirement of malfunction display When several malfunctions happen at the same time, malfunction codes will be displayed circularly. 2. Malfunction display method (1) Hardware malfunction: it will be displayed immediately, please refer to “Malfunction status sheet”; (2) Operation status: it will be displayed immediately, please refer to “Malfunction status sheet”;...
  • Page 92 Communication failure with Unit A Communication failure with Unit A Communication failure with Unit B Communication failure with Unit B Service Manual Communication failure with Unit C Communication failure with Unit C Communication failure with Unit D Communication failure with Unit D Unit A freeze protection Unit A freeze protection Viewing malfunction code...
  • Page 93 Service Manual Energize the unit Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2. if the indoor and outdoor fans are running If the above cases are existed? normally;...
  • Page 94 Service Manual 2. PFC protection malfunction, capacity charging malfunction Main checking points: If the wiring of the induction is connected well and if the induction is broken; If the mainboard is broken; Flow chart: For 14/18K Start Check if power supply is normal Turn on the unit after power supply Power supply is abnormal?
  • Page 95 Service Manual 3. Compressor desynchronizing malfunction Main checking points: If the pressure of the system is too high; If the eletric expansion valve is working normally or it is broken; If the radiation of the unit is good; Flow chart: The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer...
  • Page 96 Service Manual Desynchronizing happens during operation Check if fan Replace the fan capacitor Outdoor unit is working? terminal is connected well Improve radiation situation of the unit Unit radiation is good? (such as cleaning Replace the outdoor unit the heat exchanger, improve ventilation Turn on the unit after the power...
  • Page 97 Service Manual 4. Compressor overload, diacharge protectionmalfunction Main checking points: If the eletric expansion valve is connected well or it is broken; If there is refrigerant leakage; If the overload protector is broken; Flow chart: Start If the overload protector is connected well? Check the resistance between the two ends of the overload protector in ambient temperature, if the resistance is below 1k...
  • Page 98 Service Manual 5. Start failuremalfunction Main checking points: If the connection wire of the compressor is connected properly; If the stop duration of the compressor is sufficient; If the compressor is broken; If the refrigerant charging amount is too much; Flow chart: Energize and start the unit...
  • Page 99 Service Manual 6. Temperature sensor malfunction Main checking points: If the temperature sensor is damaged or broken If the terminal of the temperature sensor is loosended or not connected; If the mainboard is broken; Flow chart: Start Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted? Insert the temperature...
  • Page 100 Service Manual 7. DC fan malfunction Main checking points: If the outdoor fan is blocked by foreign objects; The connection wire of DC fan is connected reliably? If it is loose? Flow chart: Start Turn on the unit Check if the after removing the outdoor fan is blocked by foreign objects...
  • Page 101 Service Manual 8. Communication malfunction Main checking points: If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is connected well; If the indoor mainboard or outdoor main board is broken; Flow chart: Communication malfunction of some indoor units...
  • Page 102 Service Manual All the indoor units appear communication malfunction De-energize,check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Eliminate the malfunction Connected correctly? the wiring diagram De-energize, check if the connection wire between the outdoor mainboard and the filter board according to the wiring diagram...
  • Page 103 Service Manual 9. Anti-high temperatureand overload malfunction Main checking points: If the outdoor ambient temperature is within the normal range; If the indoor fan and outdoor fan are running normally; If the indoor and outdoor radiation environment is good; Flow chart: Start It is a normal protection, please If the outdoor ambient temperature...
  • Page 104 Service Manual 9.4 Maintenance Method for Normal Malfunction 1. Air Conditioner Can't be Started Up Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting Confirm whether it's due to power failure. If yes, No power supply, or poor After energization, operation indicator isn’t bright wait for power recovery.
  • Page 105 Service Manual 4. ODU Fan Motor Can't Operate Possible causes Discriminating method (air conditioner status) Troubleshooting Connect wires according to wiring diagram to Wrong wire connection, or poor Check the wiring status according to circuit make sure all wiring terminals are connected connection diagram firmly...
  • Page 106 Service Manual 9. Troubleshooting MFMR32-36-42kBTU 9.1 Malfunction Indicator The error code will be displayed on the wired controller and the main board of the outdoor unit. The meaning of each error, as shown in table 13. The indicator display Name of malfunction Indoor display Yellow light Red light...
  • Page 107 Communication failure with Unit A Communication failure with Unit A Communication failure with Unit B Communication failure with Unit B Service Manual Communication failure with Unit C Communication failure with Unit C Communication failure with Unit D Communication failure with Unit D Gas pipe temperature sensor malfunction of A Flash 18 times Unit A freeze protection...
  • Page 108 Service Manual Energize the unit Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2. if the indoor and outdoor fans are running normally; If the above cases are existed? 3.
  • Page 109 Service Manual 2. PFC protection malfunction, capacity charging malfunction Main checking points: If the wiring of the induction is connected well and if the induction is broken; If the mainboard is broken; Flow chart: Start Start Check if power supply is normal Check If the power supply is normal Turn on the unit after power supply...
  • Page 110 Service Manual 3. Compressor desynchronizing malfunction Main checking points: If the pressure of the system is too high; If the eletric expansion valve is working normally or it is broken; If the radiation of the unit is good; Flow chart: The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer...
  • Page 111 Service Manual Desynchronizing happens during operation Check if fan Replace the fan capacitor Outdoor unit is working? terminal is connected well Improve radiation situation of the unit Unit radiation is good? (such as cleaning Replace the outdoor unit the heat exchanger, improve ventilation Turn on the unit after the power...
  • Page 112 Service Manual 4. Compressor overload, diacharge protectionmalfunction Main checking points: If the eletric expansion valve is connected well or it is broken; If there is refrigerant leakage; If the overload protector is broken; Flow chart: Start If the overload protector is connected well? Check the resistance between the two ends of the overload protector in ambient temperature, if the resistance is below 1k...
  • Page 113 Service Manual 5. Start failuremalfunction Main checking points: If the connection wire of the compressor is connected properly; If the stop duration of the compressor is sufficient; If the compressor is broken; If the refrigerant charging amount is too much; Flow chart: Energize and start the unit...
  • Page 114 Service Manual 6. Temperature sensor malfunction Main checking points: If the temperature sensor is damaged or broken If the terminal of the temperature sensor is loosended or not connected; If the mainboard is broken; Flow chart: Start Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted? Insert the temperature...
  • Page 115 Service Manual 7. DC fan malfunction Main checking points: If the outdoor fan is blocked by foreign objects; The connection wire of DC fan is connected reliably? If it is loose? Flow chart: Start Turn on the unit Check if the after removing the outdoor fan is blocked by foreign objects...
  • Page 116 Service Manual 8. Communication malfunction Main checking points: If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is connected well; If the indoor mainboard or outdoor main board is broken; Flow chart: Communication malfunction of some indoor units...
  • Page 117 Service Manual All the indoor units appear communication malfunction De-energize,check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Eliminate the malfunction Connected correctly? the wiring diagram De-energize, check if the connection wire between the outdoor mainboard and the filter board according to the wiring diagram...
  • Page 118 Service Manual 9. Anti-high temperatureand overload malfunction Main checking points: If the outdoor ambient temperature is within the normal range; If the indoor fan and outdoor fan are running normally; If the indoor and outdoor radiation environment is good; Flow chart: Start It is a normal protection, please If the outdoor ambient temperature...
  • Page 119 Service Manual 9.3 Maintenance Method for Normal Malfunction 1. Air Conditioner Can't be Started Up Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting Confirm whether it's due to power failure. If yes, No power supply, or poor After energization, operation indicator isn’t bright wait for power recovery.
  • Page 120 Service Manual 4. ODU Fan Motor Can't Operate Possible causes Discriminating method (air conditioner status) Troubleshooting Connect wires according to wiring diagram to Wrong wire connection, or poor Check the wiring status according to circuit make sure all wiring terminals are connected connection diagram firmly...
  • Page 121 Commerciali DC Inverter Wi-Fi Ready 3.3 Error Code Number Error code Error Compressor high pressure protection Indoor anti-freeze protection Compressor low pressure protection, refrigerant lack protection and refrigerant colleting mode Compressor air discharge high-temperature protection Communication error Indoor fan error Water-full protection Indoor ambient temperature sensor error Evaporator temperature sensor error...
  • Page 122 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Number Error code Error Wired control temperature sensor error IDU jumper cap error IDU or ODU memory chip error Electric box sensor error Compressor overload protection Overload IPM protection DC fan error Driver out-of-step protection...
  • Page 123 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4 Troubleshooting 3.4.1 ―E1‖ Compressor High Pressure Protection Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: It is judged through the action of high pressure switch. If the high pressure switch is cut off, it is judged that high pressure is too high and the system stops operation for protection.
  • Page 124 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： 3.4.2 ―E2‖ Indoor Anti-freezing Protection Error display: IDU wired control and IDU receiver light board will display Error judgment condition and method: Check IDU pipe temperature. When pipe temperature is too low, freeze protection will be activated to prevent freezing damage of evaporator.
  • Page 125 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL ■Ambient temperature of IDU and ODU is too low Troubleshooting： 3.4.3 ―E3‖ Compressor Low-pressure Protection, Refrigerant Shortage Protection, Refrigerant Recovery Mode Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: It is judged through the action of low pressure switch.
  • Page 126 U-Match 5 SERIES UNIT SERVICE MANUAL TOYOTOMI ■Refrigerant charging amount is insufficient; ■System pipeline is blocked; Troubleshooting： E3 protection Enter Charge debugging mode refrigerant through wired Check if the according to the controller and select system low requirement and without refrigerant...
  • Page 127 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： E4 Compressor air discharge high - temperature protection Confirm the specific outdoor unit `s protection module and compressor Replace the temperature sensor Restart the unit and check if the Is the discharge temperature sensor `s...
  • Page 128 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL ■Connected wired controller quantity or address setting is improper ■Controller is abnormal Troubleshooting： 3.4.6 ―E8‖ Indoor Fan Error Error display: IDU wired control and IDU receiver light board will display Error judgment condition and method: Check if the rotation speed of IDU is too slow, or it stops rotation, or protection signal of outdoor fan is transferred.
  • Page 129 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： 3.4.7 ―E9‖ Water Overflow Protection Error display: IDU wired control and IDU receiver light board will display Error judgment condition and method: Check the status of IDU float switch. When water level is too high, float switch is activated, so water full protection happens.
  • Page 130 U-Match 5 SERIES UNIT SERVICE MANUAL TOYOTOMI Troubleshooting： 3.4.8 ―F0‖ Indoor Ambient Temperature Sensor Error Error display: IDU wired control and IDU receiver light board will display Error judgment condition and method: Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
  • Page 131 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： 3.4.9 ―F1‖ Evaporator Temperature Sensor Error Error display: IDU wired control and IDU receiver light board will display Error judgment condition and method: Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
  • Page 132 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Malfunction of evaporator temperature sensor Check if the evaporator Correctly insert the temperature sensor on temperature mainboard is inserted on the sensor on the needle stand correctly needle stand Disconnect Replace the...
  • Page 133 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Malfunction of condenser temperature sensor Check if the condenser Correctly insert the temperature sensor on temperature sensor mainboard is inserted on the on the needle stand needle stand correctly Disconnect Replace the...
  • Page 134 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Note：Please refer to Appendix 1 for the relation between temperature and resistance of temperature sensor. 3.4.12 ―F4‖ Discharge Temperature Sensor Error Error display: ODU mainboard, IDU wired control and IDU receiver light board will display...
  • Page 135 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Malfunction of discharge temperature sensor Check if the Correctly insert the discharge temperature sensor on temperature sensor mainboard is inserted on the on the needle stand needle stand correctly Disconnect Replace the...
  • Page 136 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.14 ―C5‖ IDU Jumper Cap Error Error display: IDU wired control and IDU receiver light board will display Error judgment condition and method: If jumper cap model doesn‗t match with mainboard, this error will be reported.
  • Page 137 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Malfunction of ODU memory chip error Replace the outdoor mainboard 3.4.16 ―PF‖ Electric Box Sensor Error Error display: ODU mainboard, IDU wired controller Error judgment condition and method: Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
  • Page 138 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.17 ―H3‖ Compressor Overload Protection Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: When the mainboard‘s interface ovc-comp is broken off for 3s, error H3 will be reported.
  • Page 139 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Overload Outdoor heat exchanger is blocked Remove the obstacle Indoor heat exchanger is blocked . Remove the obstacle Ambient temperature is out of the Normal protection . No operation range need to handle it .
  • Page 140 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： IPM protection Connect wires according to Compressor 3-phase wire connection is lack of phase or phase -reversing? the phase sequence. System is heavy-loaded? Compressor Normal protection current is too large? Replace the drive board .
  • Page 141 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Malfunction of discharge temperature sensor Check if the Correctly connect the control wire of outdoor fan motor is control wire of fan motor connected on the outdoor on the mainboard mainboard correctly...
  • Page 142 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Compressor out -of-step protection Connect wires according to Compressor3-phase wire connection is lack of phase or phased -reversing? the phase sequence Compressor phase wire connection is Fasten or replace the bad? compressor phase wires Replace the drive board .
  • Page 143 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： PFC protection Check whether power grid voltage is Normal protection normal? Drive board PFC is damaged ? Replace the drive board . 3.4.23 ―Lc‖ Startup Failure Error display: ODU mainboard, IDU wired controller and IDU receive light board will display Error judgment condition and method: Check the error code on nixie tube of ODU main control board.
  • Page 144 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： LC Startup failure System is blocked ? Eliminate system failure Short of refrigerant ? Short of Fill refrigerant in . Fill compressor oil ? compressor oil in . Compressor 3-phase sequence is...
  • Page 145 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.25 ―U7‖ 4–Way Valve Switch-Over Error Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: Possible reason: ■Voltage is abnormal. For example, low voltage will cause abnormal direction change of the 4-way valve.
  • Page 146 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： P0 Driver reset protection 3.3V drive board voltage is normal or Replace the drive board not? Re-arrange the wires. Heavy current wires s hould avoid the drive board chip. 3.4.27 ―P5‖ Over-Current Protection...
  • Page 147 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Compressor over -current protection Compressor is running at high frequency and high load . The peak Normal protection current has reached the protection value ? Reconnnect wires Compressor 3-phase wire connection according to the correct is correct or not? sequence.
  • Page 148 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： P6 Master control and driver communication error The communication wire between Reconnect or replace master contro l and driver is not the communication wire. connected, or is badly connected, or broken? Replace the drive board...
  • Page 149 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.30 ―P8‖ Driver Module High Temperature Protection Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: If IPM module temperature or PFC module temperature exceeds the set protection value, then it can be judged that driver module temperature is too high and system will shut down for protection.
  • Page 150 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL ■PFC module is damaged. ■Drive board PFC current sampling circuit element is damaged or drive chip PFC current sampling AD terminal is abnormal. Troubleshooting： AC current protection Grid voltage is normal or not ?
  • Page 151 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.33 ―Pd‖ Sensor Connection Protection Error display: ODU mainboard, IDU wired controller and IDU receive light board will display Error judgment condition and method: Sample the AD value of sensor through sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
  • Page 152 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL Troubleshooting： Bus low-voltage protection Normal Grid voltage is normal or not ? protection Replace the dr ive board . 3.4.35 ―PH‖ Bus High-Voltage Protection Error display: ODU mainboard, IDU wired control and IDU receiver light board will display...
  • Page 153 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.36 ―PU‖ Charge Loop Error Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: When the charge loop starts to get charged and the busbar voltage cannot reach the set value in a certain period of time, then it can be judged that charge loop error exists.
  • Page 154 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL ee Drive memory chip error Install the Drive board is installed with memory chip or not? memory chip . Replace the drive board . 3.4.38 ―c4‖ ODU Jumper Cap Error Error display: ODU mainboard, IDU wired control and IDU receiver light board will display Error judgment condition and method: If jumper cap model doesn‗t match with mainboard, report the error...
  • Page 155 TOYOTOMI U-Match 5 SERIES UNIT SERVICE MANUAL 3.4.39 ―EL‖ Emergency Stop (Fire Alarm) If fire alarm terminal is enabled after the IDU mainboard connects to function expansion panel, error EL will be reported. 3.5 Failures Not Caused by Errors （1）If your air conditioner fails to function normally, please first check the following items before maintenance:...
  • Page 156 Check the above items and adopt the corresponding corrective measures. If the air conditioner continues to function poorly, please stop the air conditioner immediately and contact Toyotomi‘s authorized local service center. Ask our professional service staff to check and repair the unit.

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