Sinclair SDV4 series - Page 72

82 Troubleshooting
4.8 P1 malfunction: High pressure protection
High pressure protection
Judge 1: whether the wiring is correct.
Judge 2: whether the wire body is broken.
YES
NO
Connect again.
Judge: short-circuit high pressure switch. Check the
system can operate normally.
NO
Replace the high pressure
switch.
YES
Check whether the cooling system operates normally.
Replace the main PCB.
NO
Judge 3: whether high pressure of the system is too high.
YES
Stop the system.
NO
Judge 4: whether side air duct of outdoor unit meets the
standard.
NO
Rectify the air duct
YES
Judge 5: whether the heat exchanger needs cleaning.
YES
Clean
NO
Judge 7: whether the pipeline is blocked.
YES
Rectify the pipeline.
Judge 6: whether the throttle part is stuck, stocked or works
abnormally.
YES
Change throttle parts to
clean the blockages.
LED displays P1