CHUNLAN FRD23 - Page 107

Troubleshooting
- 105 -
Phenomena Method of correction
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
Check for correct reversing of reversing valve
Reversing
valve failure
Check for intact connection of outdoor unit wiring terminal;
Check for damaged main control board;
Check for bad contact at ID/OD connecting cable cards
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
In FRD23-B, FRD35-B, FRD50-B, FR(D)95, FR(D)125/S, FR(D)71-B and FR(D)100-B air
conditioners, program controlled PCB board consists of main control board PCB1, wire
controller PCB2 and remote controller PCB3. Refer to following table for their universality:
FRD23-B
FRD35-B
FRD50-B
FR95-C
FR125-C/S
FR71-B
FR100-B
FR95
FR125
FR180/S
FR260/S
FRD71-B
FRD100-B
FRD95
FRD125/S
FRD180/S
FRD260/S
MCB PCB1
FRD35-B FRD50-B FRD95 FR95 FR180/S FRD95 FRD260/S
WC PCB2 LCD Normal
FR(D)180(260/S)
RC PCB3 Universal PCB3
Outdoor electric part is shared by FR180/S and FRD180/S, by FR260/S and FRD260/S, and
by FRD95 and FRD100-B. Others have different outdoor electric part.