Indoor Manual Auto Switch Error - Fujitsu ASU9RL Service Instruction

Trouble shooting 17
INDOOR UNIT Error Method:
INDOOR UNIT

Indoor manual auto switch error

Detective Actuators:
Indoor Unit Controller PCB Circuit
Forced auto switch
Forecast of Cause :
1. Forced auto switch failure
Check Point 1 : Check the Forced auto switch
Check if Forced auto switch is kept pressed.
Check ON/OFF switching operation by using a meter.
>>If Forced auto switch is detective, replace it.
OK OK
Check Point 2 : Replace Controller PCB
If Check Point 1 do not improve the symptom, change Controller PCB.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit : Operation LED : 4 times, Timer LED : 2 times
ERROR CODE : [E : 20]
Detective details:
When the Forced auto switch becomes ON for 30 consecutive seconds.
2.Controller PCB failure
06-21