Overload And Air Exhaust Malfunction Diagnosis - Tadiran Telecom SMVH09A-2A1B1NA Service Manual

Troubleshooting
(6) Overload and air exhaust malfunction diagnosis (following AP1 for outdoor unit control board)
Mainly detect:
●Is the PMV connected well or not? Is PMV damaged?
●Is refrigerant leaked?
Fault diagnosis process:
Resistances between the first four pins
close to the terminal hole and the fifth
pin are almost the same, less than 100
ohm.
48
20 minutes after the
complete unit is
powered off
Is the terminal FA for the
electronic expansion valve
connected correctly?
Yes
Replace the electronic
expansion valve
If the fault is eliminated?
No
Replace the
control panel
AP1
If the fault is eliminated?
No
Coolant leakage, refilling
the coolant
End
No
Connect the
wires correctly
Yes
Yes