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Pioneer WYD-GLFI SERIES Service Manual

Wd indoor / yn outdoor units series dc inverter air conditioner dc inverter split wall-mounted ductless heat pumps
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WYD-GF16-S1-1714
Troubleshooting and Repair Guideline for
WD Indoor / YN Outdoor Units
Series DC Inverter Air Conditioner

SERVICE MANUAL

DC INVERTER
SPLIT WALL-MOUNTED
DUCTLESS HEAT PUMPS
WYD-GLFI SERIES
16 SEER VERSIONS

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  Summary of Contents for Pioneer WYD-GLFI SERIES

  • Page 1: Service Manual

    WYD-GF16-S1-1714 Troubleshooting and Repair Guideline for WD Indoor / YN Outdoor Units Series DC Inverter Air Conditioner SERVICE MANUAL DC INVERTER SPLIT WALL-MOUNTED DUCTLESS HEAT PUMPS WYD-GLFI SERIES 16 SEER VERSIONS...
  • Page 2: Table Of Contents

    Contents I. Electrical Control of Inverter Air Conditioner ········································································2 1. Main compositions of the electrical control of inverter air conditioner·······························2 2. Wiring of Inverter AC Unit ································································································3 3. Current Flow ······················································································································4 4. Computer Control Function Flow Chart for Inverter AC Unit ············································5 5.
  • Page 3: Electrical Control Of Inverter Air Conditioner

    I. Electrical Control of Inverter Air Conditioner 1. Main compositions of the electrical control of inverter air conditioner The electrical control of inverter air conditioner is divided into indoor control system and outdoor control system. Relative to the fixed-speed air conditioner, the indoor control system is added with one communication circuit, but removed of the control circuits for compressor, 4-way valve and outdoor fan.
  • Page 4: Wiring Of Inverter Ac Unit

    repairing. The products 2P and higher are mainly developed for two generations. The 1 generation (VP1) applies NEC 180° sine wave plan and indoor control. The 2 generation (VP2) applies TI DSP 180° sine wave plan and outdoor control. (Exclusive of 2P unit).
  • Page 5: Computer Control Function Flow Chart For Inverter Ac Unit

    4. Computer Control Function Flow Chart for Inverter AC Unit 1) Outdoor control plan Indoor control system Outdoor control system Indoor control board IPM module Outdoor power source board Live Communication with outdoor unit Signal Storage of working parameters Neutral Communication with power Indoor fan control wire...
  • Page 6: Protection And Fault Codes

    5. Protection and Fault Codes Fault Code Fault Type Function Indicator (flash) Digital LED display Indoor/outdoor communication fault RUN & TIMER: Blink outdoor communication fault RUN & TIMER: Blink Room temperature sensor (IRT) RUN-1/8 sec. Indoor pipe (coil) temperature sensor RUN-2/8 sec.
  • Page 7 Display on outdoor power source board: The indicator alerts the fault in a cycle as such that it is bright for 0.5 seconds, dark for 0.5 seconds, blinks “n” times and then dark for 3 seconds. Blink Blink Fault Message Fault Message times(n) times(n)
  • Page 8 Display on V5 All-in-one board Blink Blink Fault Message Fault Message Counts Counts Short-circuit / open-circuit fault of IPM fault outdoor temperature sensor Outdoor coil sensor fault Absorption temperature sensor fault Exhaust temperature sensor fault Current sensor fault Compressor drive fault Compressor drive protection Outdoor overheat protection IPM protection...
  • Page 9: Troubleshooting

    II. Troubleshooting 1. According to the fault code (1) Display E1 or E2: Symptom Display E1 or E2 Room temperature sensor (IRT) and Indoor Cause pipe (coil) temperature sensor (IPT) fault Inspections How to Solve Remarks Contact between indoor Insert again if loose. Photo 1 temperature sensor CN6 (RT, IPT) and slot...
  • Page 10: Display E6

    (2) Display E6 Symptom Display E6 Cause Indoor fan motor fault Inspections How to Solve Remarks If the fan does not run, readjust Check the indoor cross-flow fan the fan position until it can run blade smoothly. If the motor insert (CN3, CN4) on Red-line indoor main PCB is in good contact Insert again if loose.
  • Page 11: Display E3, E7, E8

    (3) Display E3, E7, E8 Symptom Display E3, E7, E8 Outdoor pipe (coil) temperature sensor and Cause outdoor temperature sensor exhaust temperature sensor fault Inspections How to Solve Remarks temperature sensor Insert again if loose. Photo 3 outdoor power source board is in good contact with the slot (CN1, CN2) Replace the temperature sensor...
  • Page 12: Display E4

    (4) Display E4 Symptom Display E4 System abnormal: Let the compressor run for 5 minutes. If the indoor coil temperature cannot Cause be 2 lower than that before the compressor is ℃ started (2 higher for heating mode), it can be ℃...
  • Page 14: Display

    (5) Display EC Symptom Display EC Outdoor communication fault between power source Cause board and intelligent power module Inspections How to Solve Remarks Check the contact of communication wire Yellow-line (CN5) between power source board and Insert again if loose. part intelligent power module The indicator on power...
  • Page 15: Display

    (6) Display EP Symptom Display EP Temperature switch fault ( on top of the Cause compressor) Inspections How to Solve Remarks Check the insert position CN3 of the compressor top temperature switch Insert again if loose. Photo 10 wires on outdoor power source board Jumper short-circuiting (This No switch on compressor top...
  • Page 16 1 – 1.5P CN3 jumper. The jumper may be used as alternative if there is no compressor top switch. The correct sequence of U. V and W wiring shall be “red, white and blue”...
  • Page 17: Display

    (7) Display EA Symptom Display EA Cause Current sensor fault Inspections How to Solve Remarks Find the leakage point and Check for refrigerant leakage recharge the refrigerant If higher than 0.4V, replace the V1 inverter unit : Test the voltage Photo 13 intelligent power module of 5# pin to 2# pin on power factor...
  • Page 18: Display

    (8) Display EU Symptom Display EU Cause Voltage sensor fault Inspections How to Solve Remarks Insert again if loose. Photo 14 If the fault remains unsolved after connection again, please V1 inverter unit: Communication replace the outdoor power source wires between outdoor power...
  • Page 19: Display E9 (Firstly Display P0 Or P9, Then Change To E9)

    (9) Display E9 (Firstly display P0 or P9, then change to E9) Display E9 (Firstly display P0 or P9, then Symptom change to E9) Intelligent power module of drive and module Cause fault Inspections How to Solve Remarks If this code is displayed when the compressor is If no insert wrong, replace the started for several seconds or even not started, Photo 15...
  • Page 20 The wires on U, V and W ends are respectively colored “red, white and blue”. Apply the silicone evenly. If the screw is not fixed tightly to position, it is easy to cause poor radiation and damage to the elements.
  • Page 21: Display E0、E5

    (10) Display E0、E5 Symptom Display E0、E5 Cause Indoor / outdoor communication fault Inspections How to Solve Remarks 1. Check if the indoor and outdoor connections are correct. The terminal L and N shall correspond to each other on Photo 17 indoor and outdoor units.
  • Page 22 Check power factor correction– Test the Test the DC voltage between DC+ and DC-. pins of rectifier bridge, fast recovery diode (FRD) IGBT elements breakdown, short circuiting or damage.
  • Page 23: Display

    (11) Display EE Symptom Display EE Cause EEPROM fault Inspections How to Solve Remarks Shut down the power supply and re-energize. If the fault remains, it is needed to check if the indoor Fix again Photo 19 EEPROM installation is loose or improper.
  • Page 24: Display P0

    (12) Display P0 Symptom Display P0 Cause Variable-frequency drive Inspections How to Solve Remarks If this code is displayed when the compressor is started for several seconds If no insert wrong, replace the Photo 22 or even not started, check the compressor intelligent power module connection for correctness.
  • Page 25: Display P1

    (13) Display P1 Symptom Display P1 Cause Overvoltage / undervoltage protection Inspections How to Solve Remarks Test the supply voltage if it is normal protection between 160V ~260V(AC). exceeding this range. Photo 24 Test if the voltage between L and N normal protection terminal of outdoor unit is within...
  • Page 26: Display P4

    (15) Display P4 Symptom Display P4 Cause Exhaust overtemperature protection Inspections How to Solve Remarks Install to the position as required in Check if the air inlet and outlet of the Instruction Manual and ensure outdoor unit is blocked by any the air inlet and outlet of the obstructions.
  • Page 27: Display P6

    (17) Display P6 Symptom Display P6 Cause Overheating protection under cooling mode Inspections How to Solve Remarks Check if the air inlet and outlet of Install to the position as required in outdoor unit is blocked by any the Instruction Manual and ensure obstructions.
  • Page 28: Display P7

    (18) Display P7 Symptom Display P7 Cause Overheating protection under heating mode Inspections How to Solve Remarks Check if the air inlet and outlet of Install to the position as required in outdoor unit is blocked by any the Instruction Manual and ensure obstructions.
  • Page 29: Display P9

    (20) Display P9 Symptom Display E9 (Firstly display P0 or P9, then change to E9) Cause Intelligent power module of drive and module fault Inspections How to Solve Remarks If this code is displayed when the compressor is started for several insert wrong, seconds or even not started, check...
  • Page 30: Other Faults

    The wires on U, V and W ends are respectively colored “red, white and blue”. 2. Other faults 1) The indoor unit works normally but the outdoor unit does not work. Cause Analysis: a) If fault code is displayed: If yes, treat according to fault code. If no, check according to the following steps.
  • Page 31: The Air Conditioner Is Tripped When It Is Started

    started. If the voltage is unstable or changes too heavily, please check the power source. If no problem, check according to Step (c). c) Check if the temperature sensors are normal (See appendix for the temperature sensor parameters). Check if the resistance is drifted, open circuited or short circuited. If yes, replace the sensor.
  • Page 32 Appendix 1 Jumper for Function Selection 1. Indoor main PCB: No power relay, with duplicate Jumper for Function Selection insert as replacement Electric heater control relay...
  • Page 33 Indoor board for BL floor-standing inverter unit (display board + power drive board) 2. Outdoor power source board...
  • Page 34 3. Power factor correction 4. Intelligent power module:...
  • Page 37 23.02 24.93 26.97 2.921 3.033 3.146 0.5818 0.6148 0.649 22.04 23.84 25.77 2.827 2.933 3.04 0.5667 0.5991 0.6328 21.1 22.81 24.63 2.735 2.836 2.938 0.5521 0.5839 0.6171 20.21 21.83 23.55 2.647 2.743 2.84 Appendix 3 Silk-printed label on outdoor control board of inverter unit Control board connection Connector label Description label...
  • Page 38: Cautions On Replacement Of Pcb Boards

    Switching power output of power CN4B on Intelligent source board power module, and CN4C Power factor correction Communication signal of power CN5B on Intelligent source board and module board power module Electronic expansion valve control CN6B on Intelligent signal power module Electronic expansion valve socket Communication between...
  • Page 39 below: A\ Pre-tightening → ① ② B\ Final tightening ① ② → Figure Recommended Tightening Sequence for Screws Other cautions: As the module is a precious and expensive element, never keep the new module close to magnetic object or touch the module with electrostatic object (including direct touch with your finger).
  • Page 40 2) As the high-current circuit is close to the light-current circuit, take care on the measuring position and safety problems during repair. 3) As there is large electrolytic capacitor on the outdoor power source board, plentiful residual electrons shall be discharged for a period of time after the power supply is cut off. In this case, please wait patiently until the capacitor is fully discharged before proceeding to further operation.

This manual is also suitable for:

Wd seriesYn series