8) Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor - Mitsubishi Heavy Industries SRK60ZSX-S Technical Manual

Rotor lock
Service valve (gas side) closed operation

(8) Phenomenon observed after shortcircuit, wire breakage on sensor

(a) Indoor unit
Operation
Sensor
mode
Cooling
Room temperature
sensor
Heating
Cooling
Heat exchanger
sensor
Heating
Cooling
Humidity sensor
(1)
Heating
■ Humidity sensor operation
Failure mode
①
②
①②
① ②
Limit switch anomaly
Is the air inlet panel set correctly?
Are limit switch OK ?
Defective indoor control PCB
Shortcircuit
Are the service valve (gas side)
opened ?
YES
Is the checked result of power
transistor module OK ?
YES
Is the space for installation of indoor and/or
outdoor unit enough ?
Is there any short circuit of air on indoor
and/or outdoor unit ?
Control input circuit resding
At heating, does the indoor fan motor run ?
Is the filter clogged ?
Is there any liquid flooding ?
Is there any anomalous sound on the
compressor?
After resetting power for several
times does it become normal ?
YES
Temporary noise may cause of anomaly.
If noise source can be found, take
countermeasure.
Phenomenon
NO
Open the valve.
NO
Defective outdoor PCB
Air conditioning system operation
NO
Defective outdoor PCB
Correction, re-set
Defective limit switch
Note(1) Check if the limit switch functions properly or not by seeing whether
the lamp continues to blink or can be reset by pressing the limit swit-
-ch by hand while the air inlet panel is removed.
66
- -
'17 • SRK-T-203
Defective compressor, defective
outdoor PCB
See page 63.
Service valve (gas side) closed,
Defective outdoor PCB
Disconnected wire
Replace.
Replace.
Defective limit switch, defective indoor
control PCB, Defective air inlet panel set