Mitsubishi Alarm Code #310, #311, #312, #313 cause 1

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 –(1) >>
Poor contact of terminals on the terminal block TB11
< Check > ( Refer to Page F-10, 21 )
Check looseness of terminals ( VRF, S1, R1 ) on TB11.
< Action >
Retighten the terminals.