Daikin MC401VE, Service Manual

Page: 27 / 53

Troubleshooting SiE74-202
20 Troubleshooting
1. Troubleshooting
1.1 Equipment does not Operate
Method of
Malfunction
Detection
Malfunction
Decision
Conditions Equipment cannot be operated by remote controller or switch on main unit.
Supposed
Causes
Faulty door switch (safety switch assembly)
Blown fuse
Faulty printed circuit board (control PCB assembly, display PCB assembly)
Troubleshooting
Check connector X8A, X9A and
X10A connection of A1P
control PCB assembly.
Check door switch
(safety switch assembly).
Defective door switch
(safety switch assembly)
Correct connector
connection.
Replace A1P control PCB.
Does
equipment fail to operate
when short-circuited?
(Z0005)
Is connection
normal?
To next page
Check fuse F1U for A1P control
PCB assembly.
Is there
continuity in fuse?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
YES
YES
YES
NO
NO
NO