-
47
-
(b)
Outdoor unit
Phenomenon
Sensor
Shortcircuit
Broken wire
Cooling
System can be operated normally.
Heating
Defrosting is not performed.
Cooling
System can be operated normally.
Heating
Defrosting is not operated.
All modes
Abnormality of outdoor unit
[Compressor malfunction of
insufficient gas (refrigerant)]
Does compressor operation?
Is capacitor for compressor normal?
Replace compressor.
Replace heat exchanger sensor
Insufficient gas
Is refrigerant amount normal?
Is heat exchanger sensor resistance
value good?
Is connector for compressor connection
good?
Does trouble persist after charging gas?
Clogged capillary tube or strainer,
defective EEV, etc.
Replace capacitor for compressor.
Correct connection
Check if there are any places where
gas is leaking
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
Operation
mode
System can be operated normally.
Defrosting is performed for 10 minutes at approx. 35 minutes.
System can be operated normally.
Defrosting is performed for 10 minutes at approx. 35 minutes.
Compressor stop
Heat exchanger
sensor
Outdoor air
temperature sensor
Discharge pipe
sensor
Compressor overload protection is disabled.
(Can be operated.)
1
Humidity sensor operation
Failure mode
Control input circuit reading
Air conditioning system operation
1
Disconnected wire
Humidity reading is 0%
Operates in the Dry region
2
Disconnected wire
Humidity reading is 0%
Operates in the Dry region
12
Disconnected wire
Humidity reading is 0%
Operates in the Dry region
1
and
2
are short
Humidity reading is 100%
Operates in the Cooling region.
circuited
Disconnected
wire
Short
Circuit
Remark: Do not perform a continuity check of the humidity sensor with a tester. If DC current is applied, it
could damage the sensor.
Humidity sensor
element
Connector
(CnF)
Humidity sensor assembly
(7)
Phenomenon observed after shortcircuit, wire breakage on sensor.
(a)
Indoor unit
Phenomenon
Sensor
Shortcircuit
Broken wire
Cooling
Release of continuous compressor operation command
Heating
Continuous compressor operation command is not released.
Compressor stop.
Cooling
(Abnormality of outdoor unit)
Heating
High pressure control mode
Humidity Sensor
Cooling
1
in the table below.
Heating
Normal system operation is possible.
Operation
mode
Room temperature
sensor
Continuous compressor operation command is not released.
Release of continuous compressor operation command
Continuous compressor operation command is not released.
(Anti-frosting)
Hot keep (Indoor fan stop)
1
in the table below.
Heat exchanger
sensor
