Mitsubishi Electric PUHY-(E)P200 Service Handbook page 187

[ IX Troubleshooting ]
1. Error Code
5101
Suction temperature sensor failure (indoor unit)
5102
Liquid pipe temperature sensor failure (indoor unit)
5103
Gas pipe temperature sensor failure (indoor unit)
5104
Outdoor air temperature sensor failure (indoor unit)
2. Error definition and error detection method
If a short or an open is detected during thermostat ON, the outdoor unit turns to anti-restart mode for 3 minutes. When the
error is not restored after 3 minutes (if restored, the outdoor unit runs normally), the outdoor unit makes an error 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
(1) Thermistor failure
(2) Connector contact failure
(3) Disconnected wire or partial disconnected
thermistor wire
(4) Unattached thermistor or contact failure
(5) Indoor board (detection circuit) failure
1. Error Code
5104
Outdoor air temperature sensor failure (OA processing unit)
2. Cause, check method and remedy
(1) The connector (CN29) is not connected tightly.
(2) The outdoor air temperature sensor is broken.
HWE07010
Cause
Cause
Check method and remedy
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
Check the connector contact.
When no fault is found, the indoor board is a failure.
Check method and remedy
Check the contact of the connector.
Replace the sensor.
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