SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.

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(c) Check method when the error code is display Remote controller or Indication board: Inspection LED, error code Indoor unit PCB: Red LED (inspection display), Green LED (CPU. normal display) Outdoor unit PCB: ARed LED (inspection display), Green LED (CPU. normal display) 1 Error display : No display LCD display : No display Red LED Indoor unit Stays OFF Green LED Stays OFF Start Is the voltage between 1 and 2/N of the indoor unit’s terminal block AC220/240V? Fuse OK? YES YES Is the voltage at CNW3 or 10 (1) (red – red) on the transformer’s secondary side 14 V or higher? YES (1)(2) Is the voltage NO between CNW5 2 and 3 DC 12V? YES (1)(2) Is the voltage NO between CNW8 2 and 3 DC 12V? YES NO [Power supply line error] Red LED Outdoor unit Stays OFF Green LED Stays OFF Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Does it return to normal when the power supply is reset? Replacement indoor unit control PCB NO Voltage between YES 1 and 2/N of the outdoor unit’s terminal block is AC220/240V. NO NO Disconnect the transformer’s primary side (CNW1) and measure the resistance on both ends of CNW1 (using a tester, etc.). Several 10K Ω or higher. NO Notes (1) In models other than FDT, replace the fuse. (2) FDT only NO Note (1) In models other than FDT, it is CNW2. YES Outdoor unit check Transformer exchange Replacement indoor unit power supply PCB Harness disconnection Note (1) 3 is GND Unit is normal. (Malfunction was due to noise, etc.) - 12 - Control lines connected wrong or disconnected. YES Fuse exchange Replacement indoor unit power supply PCB
Red LED Indoor unit 3 time flash Green LED Keeps flashing Remote controller wiring connect check (Red· White·Black) OK Remote controller wire is removed Red LED Outdoor unit Stays OFF Green LED Keeps flashing Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. (1) Approximately 10 ~ 11 V between X and Z. NO YES Remeasure between X~Z. 10~11V. NO NO YES Note (1) Z is GND. (2) Is the voltage between CNW8 1-3 12V? YES Replacement indoor unit control PCB YES NO Note (2) 3 is GND. Correction Power supply reset Remote controller wire short circuit? Remote controller defective Check the CNW5-8 harness. NG Harness exchange - 13 - OK Normal? YES Maltifunction by accidental noise NO Replacement indoor unit power supply PCB Remote controller wire disconnection? Remote controller defective Only case of FDT
Page 1: SERVICE MANUAL FDA Series Split Sys
Page 4 and 5: 1. MAINTENANCE DATA 1.1 Servicing (
Page 6 and 7: - 4 - (1) Selfdiagnosis function (a
Page 8 and 9: (b) Display sequence of error, insp
Page 10 and 11: Parts layout on the indoor unit PCB
Page 12 and 13: Model: FDKN series This diagram sho
Page 16 and 17: 2 Error display “ WAIT ” Indoor
Page 18 and 19: 4 Error display : e6 [Defective ind
Page 20 and 21: 8 Error display : e10 [Control of 1
Page 22 and 23: 10 Error display : e28 [Directive r
Page 24 and 25: Parts layout on the outdoor unit PC
Page 26 and 27: - 24 - Outdoor Unit controller fail
Page 28 and 29: 3 Error display : e33 [Inverter pri
Page 30 and 31: 6 7 Error display : e36 Is the disc
Page 32 and 33: 10 11 Error display : e40 Red LED G
Page 34 and 35: 15 16 Error display : e56 Red LED G
Page 36 and 37: Power transistor module (including
Page 38 and 39: 2 OUTLINE OF OPERATION CONTROL BY M
Page 40 and 41: (b) Function setting method 1) Stop
Page 42 and 43: (d) Changing the remote controller
Page 44 and 45: (5) Test run (a) Test run method 1)
Page 46: (c) Wireless remote controller OPER

SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.

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