Blocked Valve In Cooling Mode - Mitsubishi Electric PUMY-P112VKM1 Service Manual

Check code
1501
Abnormal points and detection methods
Abnormal if stop valve is blocked during cooling operation.
Abnormal when both of the following temperature conditions are satisfied
for 20 minutes or more during cooling operation.
1. TH22j−TH21j ] −2°C
2. TH23j−TH21j ] −2°C
Note:
For indoor unit, the abnormality is detected if an operating unit satisfies the
condition.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Is the outdoor stop valve
(liquid/gas) fully open?
Disconnect the outdoor LEV wiring to
check the resistance.
Is there a resistance detected?
v
OCH576

Blocked valve in cooling mode

Diagnosis
Yes
Yes
Causes and check points
Outdoor liquid/gas valve is blocked.
Mulfunction of outdoor LEV (LEV1)(blockage)
TH21: Indoor intake temperature thermistor
TH22: Indoor liquid pipe temperature thermistor
TH23: Indoor gas pipe temperature thermistor
LEV: Electronic expansion valve
Open the outdoor stop valve (liquid/gas)
No
fully.
Replace the outdoor LEV.
No
Replace the outdoor multi controller circuit
board.
61
Remedy