Fujitsu ASU18RMLQ Service Instruction page 61

Trouble shooting 29
INDOOR UNIT Error Method:
INDOOR UNIT
VDD permanence stop protection
(Electric air clean)
Detective Actuators:
Electric air clean unit
Indoor Unit Control PCB Circuit
Forecast of Cause :
1. Electric air clean unit failure
Check Point 1 : Check the Electric air clean unit
Check the front panel is closed.
Check the Micro switch in Electric air clean unit.
(Check ON/OFF switching operation by using a meter.)
>>If Micro switch is detective, replace Electric air clean unit.
OK OK
Check Point 2 : Replace Controller PCB
If Check Point 1 do not improve the symptom, change
Trouble shooting 30
INDOOR UNIT Error Method:
INDOOR UNIT
Reverse-VDD permanence stop protection
(Electric air clean power supply circuit
Detective Actuators:
Electric air clean unit
Indoor Unit Control PCB Circuit
Forecast of Cause :
1. Electric air clean unit failure
Check Point 1 : Replace Electric air clean unit
Electric air clean unit
Change
OK OK
Check Point 2 : Replace Controller PCB
If Check Point 1 do not improve the symptom, change
Indicate or Display:
Refer to error code table.
Detective details:
When the air cleanness monitor trial protection operates 4 times.
2. Control PCB failure
Control PCB
Indicate or Display:
Refer to error code table.
abnormal)
Detective details:
The air clean operation signal was detected for 1 minute at the time
of air clean mode OFF.
2. Control PCB failure
.
Control PCB
02-35
.
.