Alarm Code #310, #311, #312, #313
Model CPE52, 53, 14, 15, 15V, 16
Failure Disconnection (#310) or Short circuit (#311) of Supply air temperature sensor (TSUP),
Disconnection (#312) or Short circuit (#313) of Return air temperature sensor (TRET)
Countermeasure
<< Cause –(2) >>
Defective Sensor ( TSUP or TRET )
< Check > ( Refer to Page F-21 )
Check the temperature displayed on the personal computer or the LCD is out of –45°C to 70°C range,
and then remove the sensor from TB11 to measure the resistance between VRF – S1 and VRF – R1.
< Action >
Out of approx. 1 – 120 kohm : Replace TSUP or TRET.
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