How To Advance Checks For Each Faulty Symptom; Inspection Method When There Is No Error Display; Louver Motor Does Not Operate; Four Way Valve Does Not Switch During Heating Operation - Mitsubishi Heavy Industries FDCA Series Technical Manual

(d) How to advance checks for each faulty symptom
(i)

Inspection method when there is no error display

1) Louver motor does not operate

Inspect at the indoor unit side.
louver operate at
Operate more than
1 min. later
operated with the remote
Defective indoor unit PCB
Replacement

3) Four way valve does not switch during heating operation

Is the voltage
betweenterminals
1 and 2 of connector
CNS (CNN1)
Defective outdoor unit PCB
Replacement
Does the
NO
power on?
YES
Is the louver
YES
controller
NO
YES
AC220V?
NO
Note (1) Items is ( ) shown in the case of models FDCA801, 1001.
NO
Is LM wire
broken?
YES
Repair the wire
Normal
Defective 20S
Replacement
154
- -
NO
Is LM
locked?
YES
Replace LM
Note (1) LM: Louver motor
Defective indoor
unit PCB