Fujitsu WATERSTAGE 112 Maintenance Document page 42

Heat Pump, Split System, Single Service, 3 phase
Clear 22: Discharge temperature protection (permanent stoppage)
Hydraulic Unit LED: Green 10 flashes / Red 1 flashes
Outdoor Unit LED: 11 flashes
Probable causes:
•
Valve is close.
•
EEV failure.
•
Gas leak, less.
•
Discharge Thermistor failure.
•
Outdoor Fan operation failure.
•
Outdoor Heat Exchanger clogged.
Check:
Cooling mode
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.
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.
4. Check Discharge Pipe Thermistor:
- Is it on the holder?
- Is there a cable pinched?
Check characteristics of thermistor (Refer to Clear 7), If defective, replace the thermistor
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.
6. Check Outdoor Fan:
Check Outdoor Fan Motor. (Refer to Clear 18)
If the Fan Motor is failure, replace it.
42
OK
OK
Heating 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
OK
OK
OK
OK
Maintenance Document 1394-1