Sinclair SDV5 Series Service Manual page 58

2.15.4 Possible causes
 Communication wire or power supply wire connection problem.
 Indoor unit main control board damaged.
 Outdoor unit main control board damaged.
2.15.5 Procedure
Waiting for 3 minutes to check whether
the fault would resume
Inspect whether indoor unit address
repeat, clear and reset indoor unit's
address to check whether fault cleared
Inspect communication wire and power
supply wire whether exist loose or poor
connection problem
Power off outdoor unit and all indoor
units, and the repower on, turn on part
of indoor units to check whether outdoor
unit operate normally
Outdoor unit main control board is fault
2.16 P1: Discharge pipe high pressure protection (for 100~160 model)
2.16.1 Digital display output
P1
2.16.2 Description
 Discharge pipe high pressure protection.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.16.3 Trigger / recover condition
 Trigger condition: Discharge pressure ≥ 4.4MPa.
 Recover condition: Discharge pressure ≤ 3.2MPa.
 Reset method: Resume automatically.
H7
No
No
No
No
There are some indoor units power off or
Yes
power on in the operation period
Yes
Indoor unit address repeat
Yes Connection wire installation problem
Yes
Indoor unit main control board is fault
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