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[P20] [High pressure protection operation]
Check code
Outdoor LED
indication
Check and Action procedure
(No specific description indicates outdoor unit parts.)
No
Yes
Service valve is fully opened
No
Open fully service valve
Yes
Outdoor PD sensor is normal
(confirmation by remote controller)
Cooling season
Cooling operation
Heating season
Heating operation
No
Replace sensor
Yes
Remove the disturbing
element
Yes
Outdoor fan is free from crack
or looseness.
No
Check outdoor fan
If defective, replace or tighten it
Yes
Outdoor fan operates normally
No
Check the same item as
those for [P22] abnormality
Reset the power source and perform
test run matching to the season
Something prevents outdoor unit
heat exchange
- Clogged heat exchanger
- Short circuit
No
Yes
Check for refrigerant overcharged, clogged
cycle, pipe break, abnormal overload, etc.
If defective, repair defective portion
Check for refrigerant overcharged, clogged
cycle, pipe break, abnormal overload, etc.
If defective, repair defective portion
Remove the
disturbing element
Something prevents heat
exchange of hydro unit
- Clogged filter
- Clogged heat exchanger
- Short circuit
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