DM17-01.01.08en Light Commercial R410A on-off
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2.3. Solving steps for typical malfunction
(1) For indoor unit
a. T1 or T2 temperature sensor open or short circuit
Checktheconnections
betweentemperature
sensorandPCB.Arethe
connectionsgood?
Correcttheconnections.No
Yes
No Replacethesensor.
ReplacetheindoorPCB
Measure theresistancevalue
ofthesensorviaAppendix 1
Isitnormal?
Yes
b. T3 temperature sensor open or short circuit
Checktheconnections
betweentemperature
sensorandPCB.Arethe
connectionsgood?
Correcttheconnections.No
Yes
No Replacethesensor.
ReplacetheoutdoorPCB
Measure theresistancevalue
ofthesensorviaAppendix 1
Isitnormal?
Yes