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Check
code
[P03]
[P04]
Outdoor
LED display
<Display 1> <Display 2>
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<Display 1> <Display 2>
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Check and troubleshooting
(Item without special mention Indicates part of outdoor unit.)
[Discharge temp. error]
∗ 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. (1) high-pressure SW system error,
(2) power supply error (Vdc), (3) high-pressure protective operation, (4) case thermo operation.
Check outdoor P.C. board (MCC-1599).
Defect → Replace
Correct connector.
Sensor error → Replace
Correct and clear the cause.
Repair defective position.
Replace defective part.
Repair defective position.
Recharge refrigerant.
Is it not abnormal overload?
Is PMV normal?
Is CN603 connection normal?
Is resistance value of TD sensor normal?
Is there no gas leak?
Is refrigerant charge amount adequate?
YES
YES
NO
YES
NO
NO
NO
YES
Connection of connectors,
Fan IPDU, Fan motor, Wiring.
Is circuit wiring normal?
Is there no fan breakage
or coming-off?
Is service valve fully opened?
Does cooling outdoor fan
normally operate?
B Cooling operation.
B ← Cooling operation
C ← Heating operation
Doesn’t high pressure switch
operate?
Are parts of
high pressure switch normal?
Reset the power supply and
then do a trial operation according
to the season.
Is there any element
which blocks heat exchanger
of the outdoor unit?
Clogging of heat exchanger
Short circuit
Parts check
Defective → Replace
Elimination of
blocking element
Check Comp. IPDU PC board
Defective → Replace
Wiring check,
Correct.
Open service valve fully.
Repair defective position.
Overcharge of refrigerant/
Clogging/Pipe breakage/
Abnormal overload
YES
YES YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
NO
[High pressure SW system error]
Power supply error (Vdc), High pressure protective operation, Case thermostat
operation.