Service manual

AUX Air Conditioner Service manual
45
1 Check the error part
2 Unfix the error part
3 Replace the part
4 Check the performance of new part
5 Service done
8.3. Detail Process
No. Malfunction Checkpoint Cause
1
Cut off the power and check the fuse on
the PCB
Fault or not? 1.Over voltage
2.Short circuit of
indoor fan motor
Check Voltage
1.Whether have got
normal AC voltage
on CN9 or not?
2
Electrify
2. DC voltage on IC6
Put-in→DC12V
Put-out→DC5V
● Rectifier circuit
goes wrong
● Step-down voltage
transformer broken
Check voltage Circuit goes wrong
1.Check the control
load of outdoor
electrical units
relay open →0.7V
relay off →12V
RELAID. RE1. RE2
RE3. RE4. RE5 RE6.
RE7. RE8 goes wrong
3
Special protect mode
2. Indoor fan
Output voltage of
Silicon controlled
rectifier IC5 is about
134VAC-160VAC
Silicon controlled IC6
goes wrong.
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