Daikin VAM 1000EJ, Service Manual

Page: 53 / 81

Troubleshooting Si-93
44 Troubleshooting
1.14 Main Unit PCB Assembly
Error Detection
Method
Check microcomputer operation monitor.
Error Generating
Conditions When main unit PCB assembly does not operate.
When communication circuit errors.
Possible Causes Fuse (excess current)
Power transformer
Noise
Main unit PCB
Troubleshooting
Main unit PCB
NO
NO
NO
YES
Does equipment
reset properly.
Is it flashing?
After checking
other possible
causes, replace
PCB assembly.
Is monitor indicator
Off?
YES
YES
Monitor indicator remains
On.
With remote controller
disconnected, check
microcomputer operation
monitor.
Turn off power, then
restart.
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.
(HF013)
(HL033)
Fuse
Microcomputer operation
monitor (green LED)
FUSE