Check code
1508
4-way valve trouble in heating mode
Abnormal points and detection methods Causes and check points
Abnormal if 4-way valve does not operate during heating operation.
Abnormal when any of the following temperature condition is satisfi ed for 3
min. or more during heating operation
1. TH22j − TH21j
]
−10 °C [14 °F]
2. TH23j − TH21j
]
−10 °C [14 °F]
3. TH22j
[
3
:
[37 °F]
4. TH23j
[
3
:
[37 °F]
Note:
For indoor unit, the abnormality is detected if an operating unit satisfi es the
condition.
4-way valve failue
Disconnection or failure of 4-way valve coil
Clogged drain pipe
Disconnection or loose connection of connectors
Malfunction of input circuit on outdoor controller board
Defective outdoor power board
TH21: Indoor intake temperature thermistor
TH22: Indoor liquid pipe tmperature thermistor
TH23: Indoor gas pipe tmperature thermistor
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
the connector for outdoor
controller board or 4-way valve coil
disconnected or loose?
Reconnect the connector or connect it
tightly..
Yes
Disconnect the connector for outdoor
controller board or 4-way valve coil to
check the resistance..
No
Replace the 4-way valve.
Replace the outdoor controller board.
Is the detected voltage normal?
Is it free from any trace of over-heating
or burning?
Is there a resistance detected?
Check the voltage and appearance of the
outdoor controller board.
No
No
Yes
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