[ IX Troubleshooting ]
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HWE1018A GB
1. Error Code
Return air temperature sensor (TH21) fault (Indoor unit)
Pipe temperature sensor (TH22) fault (Indoor unit)
Gas-side pipe temperature sensor (TH23) fault (Indoor unit)
Supply air temperature sensor fault (TH24) (Indoor unit)
2. Error definition and error detection method
If a short- or open-circuit of the sensor is detected during Thermo-ON, the unit goes into the 20-second restart delay mode.
If normal operation is not resumed in 20 seconds, the unit will come to an abnormal stop.
Short: detectable at 90°C [194°F] or higher
Open: detectable at -40°C [-40°F] or lower
Sensor error at gas-side cannot be detected under the following conditions.
During heating operation
During cooling operation for 3 minutes after the compressor turns on.
3. Cause, check method and remedy
5101
5102
5103
5104
Cause Check method and remedy
(1) Thermistor failure Check the thermistor resistor.
0°C [32°F]: 15 kohm
10°C [50°F]: 9.7 kohm
20°C [68°F] : 6.4 kohm
30°C [86°F] : 4.3 kohm
40°C [104°F] : 3.1 kohm
(2) Connector contact failure
(3) Disconnected wire or partial disconnected
thermistor wire
(4) Unattached thermistor or contact failure
(5) Indoor board (detection circuit) failure Check the connector contact.
When no fault is found, the indoor board is a failure.
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