Phenomenon Observed After Shortcircuit, Wire Breakage On Sensor - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

Rotor lock
Drain abnormality (SRR only)

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

(a) Indoor unit
Rotor lock
Operation
Sensor
Has an overflow developed?
mode
Cooling
Room temperature
sensor
Heating
Is the drain piping clogged or at
the wrong gradient?
Cooling
Heat exchanger
sensor
Heating
Cooling
Is there output for drain motor driver?
Humidity sensor
(1)
Heating
Note (1) SRK35, 50ZJ-S, 50, 60ZJX-S, SRF25, 35, 50ZJX-S only
Drain motor is defective.
Inspect wiring.
Humidity sensor operation
Failure mode
(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
Note (1) SRK35, 50ZJ-S, 50, 60ZJX-S, SRF25, 35, 50ZJX-S only
Humidity sensor operation
Failure mode
NO
Shortcircuit
YES
NO
YES
NO
YES
Control input circuit resding
Shortcircuit
Control input circuit resding
56
-
main
See pages 53.
[Drain piping defective,pump defect,
float switch, indoor PCB]
Phenomenon
Is the float switch operating?
Inspect float switch.
main
Repair and clean.
See pages 53.
Indoor PCB is defective.
Air conditioning system operation
Phenomenon
Air conditioning system operation
-
'10 • SCM-SM-094
Defective compressor, defective
outdoor PCB
Defective compressor, defective
NO
Indoor PCB is
outdoor PCB
Disconnected wire
defective.
Disconnected wire