5-19
5
L18 4-way Valve Operation Failure
Error Detection Method
Error Diagnosis
It is judged an error when during heating operation (Comp. ON), the highest detected temperature at an outdoor unit
heat exchanger (C1) was 20°C or more above the outdoor air temperature (Air Temp.) continuously for 5 minutes or
longer.
1.
2.
Is the connector wired from the 4-way valve plugged in the CN-HOT1
or CN-HOT2 connector on the HIC PC board properly?
1-1
1-2
Correct connector.
Yes
No
2
Has the 4-way valve wiring become opened?
1-2
Is the wire from the coil for controlling the 4-way valve firmly
connected to the 4-way valve?
1-3
4-way valve
1 PC board
wiring
Correct wiring.
1-3
Yes
No
2-1
Correct connector.
Yes
No
During heating mode (Comp. ON), insert and remove the connector
wired from the 4-way valve into or from CN-HOT1 or CN-HOT2
connector on the HIC PC board. At the same time, does the ON &
OFF sounds occur from the 4-way valve?
2-1
2-2
Replace HIC
PC board.
Yes
No
During heating mode (Comp. ON), does the alarm code L18
reproduce for 5 minutes or longer after insertion and removal of
CN-HOT1 or CN-HOT2 connector wired from the 4-way valve
connector on the HIC PC board?
2-2
The parts inside the 4-way valve might have fixed at the cooling side.
Replace the 4-way valve.
2-3
2-3
See what happens.
Yes
No
P03 Compressor Discharge Temperature Trouble
Error Detection Method
Error Diagnosis
1.
2.
When the discharge temperature is over 106°C.
•
1-1
1-2
2-1
2-2
Adjust the
refrigerant amount.
Replace CR board.
Yes
No
1 Adjustment
to
refrigerant
charge
Yes
No
2-2
2-3
2-4
Avoid clogging.
2-3
2-4
Replace the
electronic control
valve.
Yes
No
2 Blockage in
refrigerant
circuit
Yes
No
Tends to have insufficient refrigerant charge in the system.
Service valve inside the outdoor unit closed
Additional
refrigerant charge
2-2
Yes
No
Open service valve.
Replace CR board.
Yes
No
Replace the strainer.
Are the tubes clogged?
Is the outdoor unit’s electronic control valve operating correctly?
(Check for debris clogging the electronic control valve, a problem
with the electronical coil and/or the control PC board.)
Is it observable difference in status of the dew or frost between
the strainer’s primary and secondary sides?
Not additional refrigerant charged
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