Main Unit Pcb Assembly - Daikin VAM 150FAVE Service Manual

SiE71-202

1.14 Main Unit PCB Assembly

Error Detection
Check microcomputer operation monitor.
Method
Error Generating
When main unit PCB assembly does not operate.
Conditions
When communication circuit errors.
Possible Causes Fuse (excess current)
Power transformer
Noise
Main unit PCB
Troubleshooting
Main unit PCB
Troubleshooting
Turn off power, then
restart.
YES
Does equipment
reset properly.
NO
With remote controller
disconnected, check
microcomputer operation
monitor.
NO
Is it flashing?
YES
After checking
other possible
causes, replace
PCB assembly.
CN1
L N
CN7
Supply
air fan
H
M
L
YES
Is monitor indicator
Off?
NO
Monitor indicator remains
On.
CN2 CN3 CN4
Exhaust
air fan
(Microcomputor Operation Monitor)
P2 P1 F1 F2 J1 J2 JC
Troubleshooting
Noise may be causing erroneous
operation. If power reset does not
solve the problem, replace main unit
PCB.
There may be a malfunction in main
unit PCB fuse, main unit PCB or power
transformer.
Check fuse and transformer. If they are
normal, replace PCB.
Replace main unit PCB.
LED A
(HL031)
(HF013)
47