Troubleshooting
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Schedule of other common failures of FRD23-B, FRD35-B, FRD50-B, FR(D)95, FR(D)125/S,
FR(D)71-B and FR(D)100-B air conditioner PCB board:
Failure phenomena
Method of correction
Remote control
failure
Check for normal remote control receiver;
Check for normal remote control transmitter;
Check for normal remote controller
Remote controller
failure
Check for normal 3V batteries;
Check crystal oscillator circuit;
Check for normal transmitter;
Check for displaced or bad contact in conducting rubber
No cooling function
Check for normal temperature sensor RT1;
Check for normal DC12V, DC5V power supply;
Check for reliable connection of output ports of compressor, ID/OD fans;
Check for main control board damage
No heating function
Check for normal temperature sensor RT1;
Check for normal DC12V, DC5V power supply;
Check for reliable output port connection of compressor, reversing valve,
ID fans and OD fans;
Check for main control board damage
Reversing valve
failure
Check for intact connection of outdoor unit wiring terminal;
Check for damaged main control board;
Check for intact reversing valve
Indoor fan failure
Check for intact connection of indoor unit wiring terminal and damage of
main control board;
Check for intact indoor fans;
Check for intact fan capacitors
Outdoor fan failure
Check for intact connection of outdoor unit wiring terminal;
Check for damaged main control board;
Check for intact outdoor fans;
Check for intact fan capacitor
3. FR180/S and FR260/S electric control, protections and functions (refer to contents of
FRD95 and FRD125/S for electric heating type).
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