Indoor Manual Auto Switch Error - Fujitsu AB*A30LBT Service Instruction

Trouble shooting 21
INDOOR UNIT Error Method:

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:
Indoor Unit : Operation LED: 4 times blink, Timer LED: 2 times blink,
Filter LED
Outdoor Unit : No indication
ERROR CODE : E : 20
Detective details:
When the Forced auto switch becomes ON for 30 consecutive seconds.
2.Controller PCB failure
07-23
: OFF