46
Check code Operation cause
[21] 1. Inverter high pressure SW error.
Inverter high pressure SW system alarm 2. Inverter IOL operation.
3. Service valve closed.
4. Outdoor fan, capacitor error.
5. Indoor/Outdoor PMV blockage.
6. Outdoor heat exchanger blockage.
7. SV2 circuit blockage.
8. Indoor – Outdoor communication error.
9. Pd sensor error.
10.Refrigerant overcharge.
Does the inverter high pressure
switch operate?
Are the inverter high pressure
switch parts normal?
Is service valve fully open?
Does the cooling outdoor fan
normally operate?
Is there a problem with the
outdoor unit heat exchanger?
(1) Blockage of heat exchanger
(2) Short circuit
Il circuito di bypass della SV2 è normale?
Is SV2 bypass circuit normal?
A
Check parts.
If defective, replace.
Open service valve fully.
Remove cause.
Repair SV2 bypass circuit.
Are the connection, capacitor
and fan motor normal?
Are the high pressure sensor
characteristics normal?
See judgment flow of IPDU IOL
operation circuit “E5”.
Repair defective position.
Replace high pressure sensor.
Check outdoor IPDU PC board.
If defective, replace board.
Is the inverter IOL
circuit normal?
Is circuit wiring normal?
Check and modify wiring
j
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Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
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No
No
No
No
No
No
No
No
No
No
Troubleshooting
Diagnostic procedure for check code
(Coil error, disconnection of wiring, etc.)
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