Inspection Procedure For The Failure Which Doesn't Have An Error Code - Mitsubishi Heavy Industries FDTCVA151HEN1R Technical Manual

(5) Inspection procedure for the failure which doesn't have an error code

(a) Louver motor does not operate
Inspect at the indoor unit side.
Operate more than
1 min. later
The indoor unit PCB is
defective.
(b) 4 way valve does not switch during heating operation
Does the
NO
louver move when
the power is
supplied?
YES
Is the
louver operated
YES
with the remote
controller?
NO
Note (1) LM; Louver motor
Replace it.
Is the voltage
YES
between connector
CnS and AC
200/240V?
NO
The outdoor unit PCB is
defective. Replace it.
NO
Is the LM wire
broken?
YES
Repair the wire
Normal
4-way valve coil (20S) is
defective Replace it.
288
- -
NO The indoor unit PCB is
Is the LM
defective.
locked?
YES
Replace the LM
Replace it.