Blocked Valve In Cooling Mode - Mitsubishi Electric PUMY-P200YKM Technical & Service Manual

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Installation manual (28 pages)

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Table Of Contents

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Table of Contents

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 [28.4-F]

2. TH23j−TH21j ] −2°C [28.4-F]

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?

OCH575