Heat Pump, Split System, Single Service, 3 phase
44 Maintenance Document 1394-1
Clear 25: Compressor temperature protection (permanent stoppage)
Hydraulic Unit LED:
Green 10 flashes / Red 3 flashes
Outdoor Unit LED: 12 flashes
Probable causes:
• Valve is close.
• EEV failure.
• Gas leak, less.
• Compressor Thermistor failure.
• Outdoor Fan operation failure.
• Outdoor Heat Exchanger clogged.
Check:
1. Check if gas valve is open:
If it is not open, open it and check the
operation.
2. Check EEV and Strainer:
Are EEV and Strainer open?
If EEV or Strainer is defective, replace it.
OK
Cooling mode
1. Check if liquid valve is open:
If it is not open, open it and check the
operation.
2. Check EEV and Strainer:
Are EEV and Strainer open?
If EEV or Strainer is defective, replace it.
OK
Heating mode
3. Check if gas leak or less gas:
Measure gas pressure, if there is a leak, correct it.
If recharging refrigerant, make sure to perform vacuuming and recharge the specified amount.
OK OK
4. Check compressor temperature Thermistor:
- Is it on the holder?
- Is there a cable pinched?
Check characteristics of thermistor (Refer to Clear 11), If defective, replace the thermistor
OK
5. Check Outdoor Heat Exchanger:
- Is there any obstructing the air flow route?
- Is there any clogging of outdoor unit Heat Exchanger?
If clogged, clear the clog.
OK
6. Check Outdoor Fan:
Check Outdoor Fan Motor. (Refer to Clear 18)
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