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CODE
No.
[P04]
Outdoor
LED display
Check and troubleshooting
(Item without special mention Indicates part of outdoor unit.)
* There is a possibility that it is one of the following errors.
Confirm LED on outdoor P.C. board to judge which error it is.
Power supply error (Vdc), High pressure protective operation, Case thermostat operation
<Display 1> <Display 2>
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[Case thermostat operation] → Refer to [H04] column.
[High-pressure SW error]
1. High-pressure SW error
2. Service valve closed.
3. Indoor/Outdoor fan error
4. Clogging of indoor/outdoor PMV
5. Loading of indoor/outdoor heat exchangers or short-circuit
6. Overcharge of refrigerant
Cooling operation → B
Heating operation → C
B
Cooling operation
C
Heating operation
Doesn’t high-pressure SW operate?
Are parts of high-pressure SW normal?
Does outdoor fan normally operate?
Does the indoor fan normally operate?
Are service valves fully opened?
Reset the power supply and perform
a test run appropriate to the season
Is the circuit wiring normal?
Open service valve fully.
Take measures
for defective position.
Check parts.
Defective → Replace
Isn’t there fan crack
or getting-out of fan?
Are connector connection,
capacitor and fans of the
fan motor normal?
Are resistance value
characteristics of the sensors
(TC, TCJ) normal?
Overcharge of refrigerant
Clogging / Pipe breakage /
Abnormal overload
Overcharge of refrigerant
Clogging / Pipe breakage /
Abnormal overload
Check P.C. board.
Defective → Replace
Check and repair wiring.
Connector connection /
Fan IPDU / Fan motor / Wiring
Is there any element to disturb
heat exchange of indoor unit?
Clogging of filter
Loading of heat exchanger
Short-circuit
Is there any element to disturb
heat exchange of outdoor unit?
Loading of heat exchanger
Short-circuit
Eliminate disturbing element.
Replace TC or TCJ sensor.
Repair defective position.
Check indoor P.C. board.
Defective → Replace
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO