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16.5.25 Outdoor High Pressure Protection (H98)
Malfunction Decision Conditions:
During operation of heating, when pressure 4.0 MPa and above is detected by outdoor high pressure sensor.
Malfunction Caused:
1 Faulty
water
pump.
2 Insufficient water flow rate in system.
3 Water leak in system.
4 2/3 way closed.
5 Clogged expansion valve or strainer.
6 Excessive
refrigerant.
7 Faulty outdoor high pressure sensor.
8 Faulty outdoor unit PCB (main).
Check the system water pump.
Is the water pump working?
Check the system water passage.
Readjust the water pump
speed.
No
Is the water pump speed
adjusted according to system
hydraulic external static pressure?
Replace the faulty water
pump.
No
Yes
Check the system water
flow rate.
Is there any water leakage?
Fix the system water
leakage.
Yes
No
- Replace the outdoor unit
PCB (main)
- Replace the outdoor high
pressure sensor
Check refrigerant amount.
Is the additional refrigerant
amount filled correctly?
Reclaim and recharge with
correct amount of
refrigerant.
No
Yes
Yes
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
- Replace the expansion
valve and/or strainer
- Reclaim and recharge
refrigerant
Yes
No
Is the 2/3 way valve closed?
Open the 2/3 way valve.
Check the 2/3 way valve.
No
Yes
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution