Mitsubishi Electric EHSC-MEC Service Manual
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Mitsubishi Electric EHSC-MEC Service Manual

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HYDROBOX
SERVICE MANUAL
[Model Name]
EHSC-MEC
EHSC-VM2C
EHSC-VM2EC
EHSC-VM6C
EHSC-VM6EC
EHSC-YM9C
EHSC-YM9EC
EHSC-TM9C
EHSD-MC
EHSD-MEC
EHSD-VM2C
EHSD-YM9C
[Service Ref.]
Refer to page 2.
HYDROBOX
R410A
ERSC-MEC
ERSC-VM2C
ERSD-VM2C
EHPX-VM2C
EHPX-VM6C
EHPX-YM9C
Revision:
• Added EHSC-MECR3.UK,
• Some descriptions have
OCH571 REVISED EDITION-C
is void.
Notes:
• This manual describes ser-
CONTENTS
1. REFERENCE MANUAL ................................... 3
2. SAFETY PRECAUTION ................................... 4
3. SPECIFICATIONS ............................................ 7
4. PART NAMES AND FUNCTIONS ................ 10
5. OUTLINES AND DIMENSIONS ..................... 12
6. WIRING DIAGRAM ........................................ 14
7. FIELD WIRING ............................................... 30
8. WATER SYSTEM DIAGRAM ......................... 32
9. CONTROLS ................................................... 35
10. TROUBLESHOOTING ................................... 55
11. DISASSEMBLY PROCEDURE ...................... 72
13. SERVICE AND MAINTENANCE ................... 94
PARTS CATALOG (OCB571)
December 2018
No. OCH571
REVISED EDITION-D
EHSC-VM2CR3.UK,
EHSC-VM2ECR3.UK,
EHSC-VM6CR3.UK,
EHSC-VM6ECR3.UK,
EHSC-YM9CR3.UK,
EHSC-YM9ECR3.UK,
EHSC-TM9CR3.UK,
EHSD-MCR3.UK,
EHSD-MECR3.UK,
EHSD-VM2CR3.UK,
EHSD-YM9CR3.UK,
ERSC-MECR3.UK,
ERSC-VM2CR3.UK,
ERSD-VM2CR3.UK,
EHPX-VM2CR3.UK,
EHPX-VM6CR3.UK and
EHPX-YM9CR3.UK in
REVISED EDITION-D.
been modified.
vice data of Hydrobox only.

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  • Page 1: Table Of Contents

    HYDROBOX December 2018 No. OCH571 REVISED EDITION-D SERVICE MANUAL R410A Revision: [Model Name] • Added EHSC-MECR3.UK, EHSC-MEC ERSC-MEC EHSC-VM2CR3.UK, EHSC-VM2ECR3.UK, EHSC-VM2C ERSC-VM2C EHSC-VM6CR3.UK, EHSC-VM6ECR3.UK, EHSC-VM2EC EHSC-YM9CR3.UK, ERSD-VM2C EHSC-YM9ECR3.UK, EHSC-TM9CR3.UK, EHSC-VM6C EHPX-VM2C EHSD-MCR3.UK, EHSD-MECR3.UK, EHSC-VM6EC EHPX-VM6C EHSD-VM2CR3.UK, EHSD-YM9CR3.UK, EHSC-YM9C EHPX-YM9C ERSC-MECR3.UK, ERSC-VM2CR3.UK,...
  • Page 2 [Service Ref.] EHSC-MECR2.UK EHSC-MEC.UK EHSC-MECR1.UK EHSC-VM2C.UK EHSC-VM2CR2.UK EHSC-VM2CR1.UK EHSC-VM2ECR2.UK EHSC-VM2EC.UK EHSC-VM2ECR1.UK EHSC-VM6C.UK EHSC-VM6CR2.UK EHSC-VM6CR1.UK EHSC-VM6ECR2.UK EHSC-VM6EC.UK EHSC-VM6ECR1.UK EHSC-YM9CR2.UK EHSC-YM9C.UK EHSC-YM9CR1.UK EHSC-YM9EC.UK EHSC-YM9ECR2.UK EHSC-YM9ECR1.UK EHSC-TM9CR2.UK EHSC-TM9C.UK EHSC-TM9CR1.UK EHSD-MC.UK EHSD-MCR2.UK EHSD-MCR1.UK EHSD-MECR2.UK EHSD-MEC.UK EHSD-MECR1.UK EHSD-VM2CR2.UK EHSD-VM2C.UK EHSD-VM2CR1.UK EHSD-YM9C.UK EHSD-YM9CR2.UK EHSD-YM9CR1.UK ERSC-MECR2.UK ERSC-MEC.UK ERSC-MECR1.UK...

  • Page 3: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT'S SERVICE MANUAL Service Ref. Service Manual No. PUHZ-W50/85VHA(-BS) PUHZ-W50/85VHAR1(-BS) OCH439 PUHZ-W50VHAR2(-BS) PUHZ-W50VHAR3(-BS) PUHZ-W50VHA2(-BS) OCH605 PUHZ-W50VHA2R1(-BS) PUHZ-W85VHA2(-BS).UK PUHZ-W85VHA2R1(-BS).UK PUHZ-W85VHA2R3(-BS).UK OCH465 PUHZ-W85VHA2R4(-BS).UK PUHZ-W85VHA2R5(-BS).UK PUHZ-W112VHA(-BS) OCH562 PUHZ-W112VHAR1(-BS) PUHZ-HW112/140YHA(-BS) PUHZ-HW112/140YHA2(-BS) PUHZ-HW112/140YHA2R1(-BS) PUHZ-HW112/140YHA2R3(-BS) PUHZ-HW112/140YHA2R4(-BS) PUHZ-HW112/140YHA2R5(-BS) PUHZ-HW140VHA(-BS) OCH439 PUHZ-HW140VHA2(-BS) PUHZ-HW140VHA2R1(-BS) PUHZ-HW140VHA2R2-BS PUHZ-HW140VHA2R3(-BS) PUHZ-HW140VHA2R4(-BS) PUHZ-HW140VHA2R5(-BS) PUHZ-SW40/50VHA(-BS)

  • Page 4: Safety Precaution

    Do not position furniture or electrical appliances below the outdoor unit or hydrobox. The discharge pipework from the emergency/safety devices of the hydrobox should be installed according to local law. Only use accessories and replacement parts authorised by Mitsubishi Electric. Ask a qualified technician to fit the parts. Electrical All electrical work should be performed by a qualified technician according to local regulations and the instructions given in this manual.
  • Page 5 WARNING (SPLIT MODELS ONLY *1) Do not discharge refrigerant into the atmosphere if refrigerant leaks during installation, ventilate the room. Use appropriate tools for high pressure refrigerant. When pumping down refrigerant, stop the compressor before disconnecting the refrigerant pipes. During installation securely fasten the refrigerant pipes before starting the compressor. Check that refrigerant gas does not leak after the completion of installation.
  • Page 6 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from refrigerant cylinder (1) Check that cylinder for R410A on the market is syphon type.

  • Page 7: Specifications

    SPECIFICATIONS OCH571D...
  • Page 8 OCH571D...
  • Page 9 OCH571D...

  • Page 10: Main Remote Controller

    PART NAMES AND FUNCTIONS <E*S*-*M**C(R1)> (Split model system) <Figure 4-1> <Figure 4-2> <EHPX-*M*C(R1)> (Packaged model system) <Figure 4-3> Part name EHS*-MEC(R1) EHS*-*M*C(R1) EHSC-*M*EC(R1) ERS*-VM2C(R1) ERSC-MEC(R1) EHPX-*M*C(R1) Control and electrical box Main remote controller Plate heat exchanger (Refrigerant - Water) Water circulation pump 1 Pump valve Drain cock (Primary circuit) Booster heater 1,2...
  • Page 11 <E*S*-*M**C R2/R3> (Split model system) <Figure 4-4> <Figure 4-5> <EHPX-*M*C R2/R3> (Packaged model system) <Figure 4-6> <Figure 3.3>用 EHS*-MEC EHSC-*M*EC ERSC-MEC Part name EHS*-*M*CR2 EHS*-*M*CR3 ERS*-VM2CR2 ERS*-VM2CR3 EHPX-*M*CR2 EHPX-*M*CR3 R2/R3 R2/R3 R2/R3 Control and electrical box Main remote controller Plate heat exchanger (Refrigerant - Water) Water circulation pump 1 Pump valve...

  • Page 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS 5-1. Technical Drawings Unit: mm Hook Automatic air vent Front panel Earth leakage circuit breaker Back panel Terminal block support Main remote controller Pressure relief valve (3bar) G1/2 (242) <Front> <Side> <Rear> <EHS*> (Split model system) Letter Pipe description Connection size/type Space heating/Indirect...
  • Page 13 5-2. Service access diagrams Service access Parameter Dimension (mm) Sufficient space MUST be left for the provision of discharge pipework as detailed in National and Local building regulations. The hydrobox must be located indoors and in a frost-free environment, for example in a utility room.

  • Page 14: Wiring Diagram

    WIRING DIAGRAM 6-1. EHSC-MEC.UK, EHSD-MEC.UK, EHSD-MC.UK, ERSC-MEC.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz Connect them using either way as shown below.
  • Page 15 6-2. EHSC-MECR1.UK, EHSD-MECR1.UK, EHSD-MCR1.UK, ERSC-MECR1.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor Power supply To outdoor unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz Connect them using either way as shown below. Tool CNPWM Tool...
  • Page 16 6-3. EHSC-MECR2.UK, EHSD-MECR2.UK, EHSD-MCR2.UK, ERSC-MECR2.UK EHSC-MECR3.UK, EHSD-MECR3.UK, EHSD-MCR3.UK, ERSC-MECR3.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz Connect them using either way as shown below. Tool CNPWM Tool...
  • Page 17 6-4. EHSC-VM2C.UK, EHSC-VM2EC.UK, EHSD-VM2C.UK, ERSC-VM2C.UK, ERSD-VM2C.UK, EHPX-VM2C.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz to Booster heater Connect them using either way as shown below.
  • Page 18 6-5. EHSC-VM2CR1.UK, EHSC-VM2ECR1.UK, EHSD-VM2CR1.UK, ERSC-VM2CR1.UK, ERSD-VM2CR1.UK, EHPX-VM2CR1.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz to Booster heater Connect them using either way as shown below.
  • Page 19 6-6. EHSC-VM2CR2.UK, EHSC-VM2ECR2.UK, EHSD-VM2CR2.UK, ERSC-VM2CR2.UK, ERSD-VM2CR2.UK, EHPX-VM2CR2.UK EHSC-VM2CR3.UK, EHSC-VM2ECR3.UK, EHSD-VM2CR3.UK, ERSC-VM2CR3.UK, ERSD-VM2CR3.UK, EHPX-VM2CR3.UK Indoor unit powered Indoor unit powered via outdoor unit by independent source To outdoor Power supply To outdoor Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz to Booster heater Connect them using either way as shown below.
  • Page 20 6-7. EHSC-VM6C.UK, EHSC-VM6EC.UK, EHPX-VM6C.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz to Booster heater Connect them using either way as shown below. ~/N 230V 50Hz Tool CNPWM...
  • Page 21 6-8. EHSC-VM6CR1.UK, EHSC-VM6ECR1.UK, EHPX-VM6CR1.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply Power supply unit ~/N 230V 50Hz unit <How to use TBO.1 to 4> to Booster heater Connect them using either way as shown below. ~/N 230V 50Hz Tool CNPWM...
  • Page 22 6-9. EHSC-VM6CR2.UK, EHSC-VM6ECR2.UK, EHPX-VM6CR2.UK EHSC-VM6CR3.UK, EHSC-VM6ECR3.UK, EHPX-VM6CR3.UK Indoor unit powered Indoor unit powered via outdoor unit by independent source To outdoor Power supply To outdoor Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz to Booster heater Connect them using either way as shown below.
  • Page 23 6-10. EHSC-YM9C.UK, EHSC-YM9EC.UK, EHSD-YM9C.UK, EHPX-YM9C.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz Power supply to Booster heater Connect them using either way as shown below. 3~ 400V 50Hz Tool Tool...
  • Page 24 6-11. EHSC-YM9CR1.UK, EHSC-YM9ECR1.UK, EHSD-YM9CR1.UK, EHPX-YM9CR1.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply <How to use TBO.1 to 4> unit ~/N 230V 50Hz unit Power supply to Booster heater Connect them using either way as shown below. 3~ 400V 50Hz Tool CNPWM...
  • Page 25 6-12. EHSC-YM9CR2.UK, EHSC-YM9ECR2.UK, EHSD-YM9CR2.UK, EHPX-YM9CR2.UK EHSC-YM9CR3.UK, EHSC-YM9ECR3.UK, EHSD-YM9CR3.UK, EHPX-YM9CR3.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor Power supply To outdoor unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz Power supply to Booster heater Connect them using either way as shown below.
  • Page 26 6-13. EHSC-TM9C.UK Indoor unit powered Indoor unit powered via outdoor unit by independent source To outdoor To outdoor Power supply Power supply <How to use TBO.1 to 4> unit ~/N 230V 50Hz unit to Booster heater Connect them using either way as shown below. 3~ 230V 50Hz Tool Tool...
  • Page 27 6-14. EHSC-TM9CR1.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply Power supply <How to use TBO.1 to 4> unit ~/N 230V 50Hz unit to Booster heater Connect them using either way as shown below. 3~ 230V 50Hz Tool CNPWM...
  • Page 28 6-15. EHSC-TM9CR2.UK EHSC-TM9CR3.UK Indoor unit powered Indoor unit powered by independent source via outdoor unit To outdoor To outdoor Power supply Power supply unit unit <How to use TBO.1 to 4> ~/N 230V 50Hz to Booster heater Connect them using either way as shown below. 3~ 230V 50Hz Tool CNPWM...
  • Page 29 6-16. DIP switch functions Located on the FTC printed circuit board are 5 sets of small white switches known as DIP switches. The DIP switch number is printed on the circuit board next to the relevant switches. The word ON is printed on the circuit board and on the DIP switch block itself.

  • Page 30: Field Wiring

    FIELD WIRING Breaker abbreviation Meaning ECB1 Earth leakage circuit breaker for booster heater Terminal block 1 Option 1: Hydrobox powered via outdoor unit <1 phase> Affix label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units. Hydrobox Outdoor unit Power...
  • Page 31 Option2: Hydrobox powered by independent source If the hydrobox and outdoor units have separate power supplies, the following requirements MUST be carried out: • Change connector connections in hydrobox control and electrical box (see Figure 7-3). White Initial settings CN01 •...

  • Page 32: Water System Diagram

    WATER SYSTEM DIAGRAM <E*S*> (Split model system) Refrigerant pipe Notes: • Be sure to follow your local regulations to per- Water pipe form system configuration of the DHW connec- Hydrobox tions. Cold water • DHW connections are not included in the hy- drobox package.
  • Page 33 Local system 1-zone temperature control Zone1 Zone1 2-zone temperature control 1-zone temperature control with boiler Zone1 Zone1 Zone2 2-zone temperature control with boiler 1-zone temperature control (2-zone valve ON/OFF control) Zone1 Zone1 Zone2 Zone2 1. Zone1 heat emitters (e.g. radiator, fan coil unit) (local supply) 10.
  • Page 34 Filling the System (Primary Circuit) 1. Check and charge expansion vessel. 2. Check all connections including factory fitted ones are tight. 3. Insulate pipe work between hydrobox and outdoor unit. 4. Thoroughly clean and flush, system of all debris. (Refer to 4.2 in the installation manual.) 5.

  • Page 35: Controls

    CONTROLS 9-1. Main remote controller <Main remote controller parts> Letter Name Function Screen Screen in which all information is displayed Menu Access to system settings for initial set up and modifications. Back Return to previous menu. Confirm Used to select or save. (Enter key) Power/Holiday If system is switched off pressing once will turn system on.
  • Page 36 9-2. Setting the Main remote controller After the power has been connected to the outdoor and hydrobox (See "7. FIELD WIRING") the initial system settings can be entered via the main remote controller. 1. Check all breakers and other safety devices are correctly installed and turn on power to the system. 2.
  • Page 37 <Main remote controller Menu Tree> Initial Unrestricted access Main screen * Short press for 1 Zone system. Installer only Shaded items relate Information to DHW functions. These are only avail- Option Forced DHW ON ( )/OFF able if the system in- ON ( )/Prohibited ( )/Timer ( ) cludes a DHW tank.
  • Page 38 <Continued from the previous page.> Unrestricted access <Main remote controller Menu Tree> Installer only Initial Shaded items relate to DHW functions. Main screen Main These are only avail- menu able if the system in- Manual operation Menu cludes a DHW tank. Function settings Service Thermistor adjustment...
  • Page 39 9-4. Service Menu The service menu provides functions for use by installer or service engineer. It is NOT intended the home owner alters settings within this menu. It is for this reason password protection is required to prevent unauthorised access to the service settings. The factory default password is "0000".
  • Page 40 <Thermistor adjustment> This function allows adjustments to be made to the thermistor readings from −10 to 10°C in 0.5°C intervals. THW1: Thermistor (Flow water temp.) THW2: Thermistor (Return water temp.) THW5: Thermistor (DHW tank water temp.)(Option) THW6: Thermistor (Zone1 flow temp.)(Option) THW7: Thermistor (Zone1 return temp.)(Option) THW8: Thermistor (Zone2 flow temp.)(Option) THW9: Thermistor (Zone2 return temp.)(Option)
  • Page 41 Mixing valve control 1. From the Auxiliary settings menu, highlight Mixing valve control. 2. Press CONFIRM. 3. The Mixing valve control screen is displayed. 4. Use F1 and F2 buttons to set Running time between 10 to 240 seconds. The Running time equals to a period from full open of the valve (at a hot water mixing ratio of 100%) to full close (at a cold water mixing ratio of 100%).
  • Page 42 <Operation settings> Heating operation This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC collects and processes data for the auto adaptation mode. Menu subtitle Function Range Unit Default Flow temp.
  • Page 43 0 kW 0 kW * EHSD-VM2C 2 kW 0 kW 0 kW * EHSD-YM9C 3 kW 6 kW 0 kW * EHSC-MEC 0 kW 0 kW 0 kW * EHSC-VM2C 2 kW 0 kW 0 kW * EHSC-VM2EC 2 kW...
  • Page 44 <External input settings> Demand control(IN4) The selection of “OFF”, whilst a signal is being sent to IN4, forcefully stops all the heat source operations and the selection of “Boiler” stops operations of heat pump and electric heater and performs boiler operation. Outdoor thermostat (IN5) External input settings menu screen The selection of “Heater”, whilst a signal is being sent to IN5, performs...
  • Page 45 <Summary of settings> This function shows the current installer/user entered settings. Abbreviation Explanation Abbreviation Explanation HWtemp DHW max temperature Z2 mode Operation mode HWdrop DHW temperature drop - HER (Heating room temperature) HWtime DHW max operation time - HE (Heating flow temperature) NO HW DHW mode restriction - HCC (Heating compensation curve)
  • Page 46 Resetting the password If you forget the password you entered, or have to service a unit somebody else installed, you can reset the password to the factory default of 0000. 1. From the main settings menu, scroll down the functions until Service Menu is highlighted.
  • Page 47 <Table 9-4-1> Request code in running information Request Request content Range Unit code Error history 1 (latest) Displays error history. ("– –" is displays if no history is present.) Code Error history 2 (second to last) Displays error history. ("– –" is displays if no history is present.) —...
  • Page 48 Indoor unit switch setting display (Request code: 162 to 166) 0: OFF 1: ON 0: OFF 1: ON SW1, SW2, SW3, SW4, SW5 SW1, SW2, SW3, SW4, SW5 Display Display 00 00 00 40 00 01 00 41 00 02 00 42 00 03 00 43...
  • Page 49 Indoor unit switch setting display (Request code: 162 to 166) 0: OFF 1: ON 0: OFF 1: ON SW1, SW2, SW3, SW4, SW5 SW1, SW2, SW3, SW4, SW5 Display Display 00 80 00 C0 00 81 00 C1 00 82 00 C2 00 83 00 C3...
  • Page 50 Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following. 0: OFF 1: ON 0: OFF 1: ON Display Display xx 40 xx 00 xx 01 xx 41 xx 02 xx 42 xx 43 xx 03 xx 04...
  • Page 51 Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following. 0: OFF 1: ON 0: OFF 1: ON Display Display xx C0 xx 80 xx C1 xx 81 xx C2 xx 82 xx C3 xx 83 xx C4...
  • Page 52 Display Output signal display (Request code: 175/553) 40 xx Please refer to Table 2 on relevant wiring diagram whilst using the following. 41 xx 42 xx 0: OFF 1: ON 43 xx Display 44 xx 45 xx 00 xx 46 xx 01 xx 47 xx 02 xx...
  • Page 53 Input signal display (Request code: 176/554) Please refer to Table 1 on relevant wiring diagram whilst using the following. 0: OFF (open) 1: ON (short) 0: OFF (open) 1: ON (short) Display Display 00 00 00 40 00 01 00 41 00 02 00 42 00 03...
  • Page 54 Indoor unit only operation Indoor unit only operation In indoor unit only operation, an operation without connecting outdoor unit is possible. Indoor unit During Indoor unit only operation, the main control has control functions. Necessary Heat pump Not necessary <Heater> Main remote controller Necessary Heating for DHW and space heating is provided by the heater.

  • Page 55: Troubleshooting

    TROUBLESHOOTING 10-1. Troubleshooting <Summary of self diagnosis based on Error Codes and Service Procedures> Present and past Error codes are logged and displayed on the main remote controller or control board of the outdoor unit. Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field. Unit Condition Error Code Action...
  • Page 56 10-4. Self diagnosis and action Check if DIP SW is set correctly. (Refer to "6-16. DIP switch functions".) Error code Title and display conditions Possible Cause Diagnosis and action Circulation water temperature overheat Insufficient system head Refer to table in "10-6. Checking Component protection Parts' Function"...
  • Page 57 Error code Title and display conditions Possible Cause Diagnosis and action P1/P2/L5/LD Indoor unit temperature thermistor failure Connector/terminal wire has become Visually check the terminals and connec- Note: The thermistors subject to failure can be detached or loose wiring. tions and reattaches appropriate. checked in “Request code: 567”...
  • Page 58 Error code Title and display conditions Possible Cause Diagnosis and action Heating operation error THW1 has become detached from its Visually inspect location and reattach as Note: “3” is displayed in “Request code: 567” in holder. necessary. “Running information”. <Heating/FS> Booster heater fault Electrically test to determine fault.
  • Page 59 Error code Title and display conditions Possible Cause Diagnosis and action Low primary circuit (Zone2 side) flow rate Insufficient system head If more head required either add a pump of the same size or replace existing pump. detected by flow switch Note: “3” is displayed in “Request code: 569” in Reduced flow in primary water circuit Check circulation pump (See "10-6.
  • Page 60 Error code Title and display conditions Possible Cause Diagnosis and action <Defrosting> <Defrosting> THW2 detects a temperature ≤15ºC and TH2 Reduced water flow 1., 2. Check water piping. detects a temperature ≤−16ºC for consecutive 10 • Clogged filter seconds. • Leakage of water Low temperature •...
  • Page 61 Error code Title and display conditions Possible Cause Diagnosis and action E1/E2 Fault with the main remote controller Replace main remote controller circuit Main remote controller control board failure circuit board board. Error code E1 displayed if main remote control- ler cannot access it is non-volatile (non power dependent) memory.
  • Page 62 10-5. Troubleshooting by inferior phenomena Fault symptom Possible cause Explanation - Solution Main remote controller 1. There is no power supply to main remote 1. Check LED2 on FTC. (See "6. WIRING DIAGRAM".) display is blank. controller. (i) When LED2 is lit. Check for damage or contact failure of the main remote controller wiring.
  • Page 63 Contact your Mitsubishi Electric dealer. 7. Immersion heater cut-out tripped. 7. Check immersion heater thermostat and press reset button, located on im- mersion heater boss, if safe.
  • Page 64 Contact your Mitsubishi Electric dealer. 5. Immersion heater cut-out has been triggered. 5. Check immersion heater thermostat and press reset button if safe. If the heater kept running with no water inside, this may have resulted in failure, so replace it with a new one.
  • Page 65 Fault symptom Possible cause Explanation - Solution In 2-zone tempera- When Zone1 and Zone2 are both in heating Normal operation, no action necessary. ture control, only mode, the hot water temperature in Zone2 Zone2 does not does not exceed that in Zone1. reach the set tem- Faulty wiring of motorized mixing valve Refer to "5.3 Wiring for 2-zone temperature control"...
  • Page 66 ON and OFF. Annual Maintenance It is essential that the hydrobox is serviced at least once a year by a qualified individual any spare parts required MUST be purchased from Mitsubishi Electric (safety matter). NEVER bypass safety devices or operate the unit without them being fully operational.
  • Page 67 10-6. Checking Component Parts' Function Part Name Check Points <Water Circulation Pump Characteristics> EHSC series 80.0 Speed 5 (Default) 70.0 BROWN Speed 4 PWM input signal Signal cable Speed 3 BLUE 60.0 Signal ref. Speed 2 BLACK 50.0 Speed 1 Feedback signal 40.0 BROWN...
  • Page 68 Part Name Check Points Earth leakage circuit breaker for heater If a short circuit occurs on the booster heater, immersion heater, or each power line, a short-circuit breaker will trip and power source will be blocked. Eliminate the causes of short circuit and then turn on the breaker again. Relay for heater When the applied voltage is not 230 V AC across the terminals A1-A2, check the terminals A1 A2...
  • Page 69 Part Name Check Points Thermistors Disconnect the connector then measure the resistance with a tester. (At ambient temperatures of 10 to 30°C.) Thermistor Normal Abnormal THW1 THW2 THW5 4.3–9.5 kΩ Open or short THW6 THW7 THW8 THW9 THWB1 40–100 kΩ Open or short THWB2 Flow sensor...
  • Page 70 <Thermistor Characteristics Charts> • Room temperature thermistor (TH1) • Liquid refrigerant temperature thermistor (TH2) • Flow water temperature thermistor (THW1) • Return water temperature thermistor (THW2) • DHW tank temperature thermistor (THW5) • Zone1 flow water temperature thermistor (THW6) • Zone1 return water temperature thermistor (THW7) •...
  • Page 71 10-7. Test point diagram FTC (Controller board) CNP1/OUT1 (TBO.1 1-2) Water circulation pump1 (230 V AC) OUT2 (TBO.1 3-4) Water circulation pump2 (Local supply) (230 V AC) CN01 OUT3 (TBO.1 5-6) Power supply Water circulation pump3 (230 V AC) (Local supply) (230 V AC) CNP4/OUT14 Water circulation pump4 (230 V AC)

  • Page 72: Disassembly Procedure

    DISASSEMBLY PROCEDURE <Preparation for the repair service> ● Prepare the proper tools. ● Prepare the proper protectors. ● Provide adequate ventilation. ● After stopping the operation of the hydrobox and outdoor unit, turn off all the power-supply breaker. ● Discharge the condenser before the work involving the electric parts. ●...
  • Page 73 PHOTOS/ FIGURES DISASSEMBLY PROCEDURE 3. How to remove the electrical parts Photo 3-1 Control box fixing screws (Steps (1) through (3) are applied to all the following parts.) (1) Remove the front panel. (Refer to Procedure 1). (2) Remove the 3 screws holding the control box. (Photo 3-1) (3) Slightly lift and pull out the control box.
  • Page 74 PHOTOS/ FIGURES DISASSEMBLY PROCEDURE 4. How to swing the control box to the front Photo 4-1 (1) Remove the front panel. (Refer to Procedure 1.) Earth cable Side panel (2) Remove the screw from the control box bracket (R) and 2 screws from the control box bracket (L).
  • Page 75 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 5. How to remove water pump/ pump valve Photo 5-1 Water pump E*S* series Cable connector (CNP1) CNPWM clamp <Water pump> Earth cable connector Close the pump valve (OFF) before removing the water pump, Lead and open the valves (ON) after reinstalling the water pump. wire (1) Remove the front panel.
  • Page 76 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 5. How to remove water pump/ pump valve(continued) Photo 5-5(EHPX series) EHPX series <Water pump> Gasket Terminal Gasket Close the pump valve and strainer valve (OFF) before (G1") (G1") (G1") (G1") removing the water pump, and open the valves (ON) after reinstalling the water pump.
  • Page 77 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 6. How to remove the flow sensor Photo 6-1 (1) Remove the front panel. (Refer to Procedure 1.) (2) Disconnect the CN1A connector on the controller board. (Photo 6-1) (3) Release the flow sensor lead wire from the cable clamp, the 2 cable straps, the coated clamp and feed the lead wire out the control box without putting strain on the CN1A...
  • Page 78 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 7-1 7. How to remove the booster heater (1) Remove the front panel. (Refer to Procedure 1.) Booster heater Control box (2) Disconnect the booster heater lead wires from the CNBHT connector (CNBHT) connector on the controller board and from the BHC1 (Lead wire No.1, No.2 and No.3) and BHC2 (Lead wire No.4, No.
  • Page 79 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 7. How to remove the booster heater (continued) EHPX series> < (4) Detach the quick connection 1 and 2. (Photo 7-4) • When reinstalling the quick connections, use new O-rings. • Refer to page 90 for how to attach and detach the quick connection.
  • Page 80 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 8. How to remove the plate heat exchanger Photo 8-1 CNPWM Water pump (1) Pump down the refrigerant circuit and close the stop connector connector (CNP1) valve on the outdoor unit. (Refer to "12. Supplementary Earth cable information".) (2) Remove the front panel.
  • Page 81 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 8-3(ERSC series) 8. How to remove the plate heat exchanger (continued) <ERSC series> (7) Close the strainer valve and remove the G1" nut on the water outlet side of the strainer valve using 2 spanners: one to hold the strainer valve and the other to turn the G1"...
  • Page 82 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES <EHSC series> Photo 8-6(EHSC series) Procedure (1) to (6) is the same as <ERSC series>. (7) Remove the G1" nut on the water inlet side of the strainer valve using 2 spanners: one to hold the strainer valve and the other to turn the G1"...
  • Page 83 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 8. How to remove the plate heat exchanger (continued) Refer to the previous page for step (1) to (5). (Skip (4).) <E*SD series> (6) Remove the pipe (W.C.-W.P) and L joint (upper) together by detaching the quick connection for the L joint (upper) and the plate heat exchanger.
  • Page 84 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 8. How to remove the plate heat exchanger(continued) Photo 8-8(E*SD series) <E*SD series> Pump support (12) Remove the flare nuts on the gas and liquid pipes under the hydrobox using 2 spanners: one to hold each flare joint and the other to turn each flare nut.
  • Page 85 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 9-1(ERS* series) 9. How to remove the strainer <ERS* / EHS* series> Strainer Quick Strainer (1) Remove the front panel. (Refer to Procedure 1.) O-ring valve stay connection valve Screws (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Close the strainer valve (OFF).
  • Page 86 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 9-6(EHPX series) 9. How to remove the strainer(continued) <EHPX series> Strainer Strainer (1) Remove the front panel. (Refer to Procedure 1.) Nut (G1") valve stay valve L joint (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Close the strainer valve (OFF).
  • Page 87 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 10. How to remove the manometer / pressure relief valve / air Photo 10-1 vent (automatic) Claw Screw (1) Remove the front panel. (Refer to Procedure 1.) (2) Swing the control box to the front. (Refer to Procedure 4.) <Manometer>...
  • Page 88 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 10. How to remove the manometer / pressure relief valve / air Photo 10-5 (R3 model only) vent (automatic) (Continued) Expansion vessel Pressure relief valve (5bar) <Pressure relief valve(5bar)> (3) Remove the right side panel. (4) Remove the band at the base of the pressure relief valve(5bar).
  • Page 89 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES 12. How to remove the drain cock (primary circuit) Photo 12-2 (EHPX series) (1) Remove the front panel. (Refer to Procedure 1.) Booster heater Drain cock (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Remove the drain cock (primary circuit).
  • Page 90 DISASSEMBLY PROCEDURE PHOTOS/ FIGURES Photo 14-1 14. How to remove the drain pan (ERS*series) (1) Remove the front panel. Strainer valve stay Strainer valve (2) Disconnect all the field piping. (3) Remove the saddle band and the rubber tube by removing the 2 screws.
  • Page 91 PHOTOS/ FIGURES DISASSEMBLY PROCEDURE Photo 15-1 15. How to detach and attach the quick joint Refer to the following steps when detaching and attaching the quick connection. (1) Remove the clip. (Photos 15-1 and 15-2) (2) Separate the connected parts to remove the O-ring. (Photo 15-3) •...
  • Page 92 Notes on replacing the parts Replacement of the parts listed below requires the following procedure. After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specified tighten- ing torques below.

  • Page 93: Supplementary Information

    SUPPLEMENTARY INFORMATION 12-1. Refrigerant collecting (pumpdown) for split model systems only Refer to “Refrigerant collection” in the outdoor unit installation manual or service manual. 12-2. Back-up operation of boiler Heating operation is backed up by boiler. For more details, refer to the installation manual of PAC-TH011HT-E. <Installation &...

  • Page 94: Service And Maintenance

    SERVICE AND MAINTENANCE The main remote controller settings changed from the default settings are reset by replacing the controller board. To facilitate re-selecting settings on the main re- mote controller, it is recommended to write down the changes in the sheet below before replacement. 13-1.
  • Page 95 Engineers Forms (2/2) Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters Notes setting setting Service Pump speed Pump speed (1–5) menu Heat source setting Standard/Heater/Boiler/Hybrid Standard Operation Heating operation Flow temp.range Min.temp. (25–45°C) 30°C settings Max.temp.
  • Page 96 13-2. Annual Maintenance Log Book Contractor name Engineer name Site name Site number Hydrobox maintenance record sheet Warranty number Model number Serial number Mechanical Frequency Notes Isolate and drain hydrobox, remove mesh from internal strainer clean and replace. Open the pressure relief valve, check for unrestricted discharge to the tundish and that the valve reseats correctly.
  • Page 97 OCH571D...
  • Page 98 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2018 No. OCH571 REVISED EDITION-D Issued: Sep. 2016 No. OCH571 REVISED EDITION-C Issued: Aug. 2015 No. OCH571 REVISED EDITION-B Issued: Apr. 2015 No. OCH571 REVISED EDITION-A Published: Oct.

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