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Outdoor fan motor error (Failure of fan motor, failure of outdoor PCB)
(8) Actions in case of short circuit and wire break of sensor
(a) Indoor unit
Become the compressor continuous
operation instruction
No compressor operation instruction
obtained
No compressor operation instruction
obtained
Become the compressor continuous
operation instruction
Usual operation of system is
possible.
No compressor operation instruction
obtained (frost prevention)
High pressure control mode
(inverter stop instruction)
Heat-retaining (stop of indoor fan)
Usual operation of system is possible.
Note: (1) Only Model 50 has a humidity sensor.
① Actions of humidity sensor
Reading of
control input
circuit
Operation of air
conditioner
Operating in cooling
mode
Note: Do not use an instrument for power-on inspection of the humidity
sensor. Accidents may occur if DC is applied.
Heat
exchanger
liquid pipe
sensor
Usual operation of system is
possible.
Usual operation of system is
possible.
The defrosting does not function.
10 min. defrosting about once an
hour
Usual operation of system is
possible.
Usual operation of system is
possible.
The defrosting does not function.
10 min. defrosting about once an
hour
Compressor
vent-pipe
sensor
Compressor over heat protection is
impossible. (The unit can run.)
The compressor stops. (The inverter
does not output.)
Is the connection of the connector
normal?
Has voltage been applied to the fan
motor?
Humidity sensor component
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