Panasonic Elite Big PAC-i S-200PE3E5B Technical Data & Service Manual page 219

L18 4-way Valve Operation Failure
1. Error Detection Method
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.
2. Error Diagnosis
1 PC board
Is the connector wired from the 4-way valve plugged in the CN-HOT1
1-1
wiring
or CN-HOT2 connector on the HIC PC board properly?
1-2 Has the 4-way valve wiring become opened?
Is the wire from the coil for controlling the 4-way valve firmly
1-3
connected to the 4-way valve?
2 4-way valve
During heating mode (Comp. ON), insert and remove the connector
wired from the 4-way valve into or from CN-HOT1 or CN-HOT2
2-1
connector on the HIC PC board. At the same time, does the ON &
OFF sounds occur from the 4-way valve?
During heating mode (Comp. ON), does the alarm code L18
reproduce for 5 minutes or longer after insertion and removal of
2-2
CN-HOT1 or CN-HOT2 connector wired from the 4-way valve
connector on the HIC PC board?
The parts inside the 4-way valve might have fixed at the cooling side.
2-3
Replace the 4-way valve
P03 Compressor Discharge Temperature Trouble
1. Error Detection Method
• When the discharge temperature is over 106°C.
2. Error Diagnosis
1 Adjustment
to
1-1 Not additional refrigerant charged
refrigerant
charge
1-2 Tends to have insufficient refrigerant charge in the system.
2 Blockage in
2-1 Service valve inside the outdoor unit closed
refrigerant
circuit
2-2 Are the tubes clogged?
Is the outdoor unit's electronic control valve operating correctly?
2-3 (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
2-4
the strainer's primary and secondary sides?
5-19
Yes 1-2
No Correct connector
Yes Correct wiring
No 1-3
Yes 2-1
No Correct connector
Yes 2-2
Replace HIC
No
PC board
Yes 2-3
No See what happens
Additional
Yes
refrigerant charge
No 2-2
Adjust the
Yes
refrigerant amount
Replace CR board
No
Yes Open service valve
No 2-2
Yes Avoid clogging
No 2-3
Yes 2-4
Replace the
No electronic control
valve
Yes Replace the strainer
No Replace CR board
5