Panasonic U-72MF1U9E Service Manual download pdf (Page 77)

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Trouble Diagnosis

3. W-3WAY VRF Alarm Codes

H08, H27 Alarm

Alarm code H08, H27

Alarm meaning

H08: Trouble (open circuit) with the oil sensor (connection) at compressor 1

H27: Trouble (open circuit) with the oil sensor (connection) at compressor 2

This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, pins 4

and 5 for compressor 2, and pins 7 and 8 for compressor 3) is open.

Alarm conditions

Probable cause Disconnected connector.

Check Check that the connector is securely connected.

Correction (1)

(2)

Example

Notes

—

Connect the connector.

Correct the connection at connector pins 4 and 5.

SM830202-00_3WAY VRF.indb 15SM830202-00_3WAY VRF.indb 15 2012/01/30 14:53:032012/01/30 14:53:03

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Panasonic U-72MF1U9E Service Manual Page 77