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Mitsubishi Electric PFAV-P250VM-E Service Manual page 156

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Table of Contents
[ X Troubleshooting ]
1. Error Code
5101
Return air temperature sensor (TH21) fault (Indoor unit)
5102
Pipe temperature sensor (TH22) fault (Indoor unit)
5103
Gas-side pipe temperature sensor (TH23) fault (Indoor unit)
5104
Intake air temperature sensor (TH24) fault (Fresh Air intake type 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
HWE10190
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.
- 147 -
GB
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