Troubleshooting; Equipment Does Not Operate - Daikin MC401VE Service Manual

Troubleshooting

1. Troubleshooting

1.1

Equipment does not Operate

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