York HP Series Service Manual page 123

Current protection of compressor
Was the protection activated
in standby?
No
Is the power voltage is
normal?
Yes
Is outdoor terminal voltage
normal ？
Yes
Is the voltage between L and
N is normal ？
Yes
Is the input voltage of the
bridge rectifier is normal ？
Yes
Is the current normal ？
No
Is the voltage between P and
N normal refer according to
Appendix 3 ？
Yes
Is the outdoor ambient
temperature is higher than
50 ℃ ?
No
Is the outdoor unit
ventilation functioning
properly?
Yes
Is the outdoor fan running
No
properly?
Yes
Is the heat exchanger dirty?
No
Replace outdoor main
board. Does a problem still
exist?
No
Is system pressure too high?
No
Check whether the refrigerant
system is running normally
Restart the unit when the power
No
supply returns to normal
Is the power wiring
No
wired correctly?
Are L and N wired
No
properly?
Is the bridge
No rectifier wired
properly?
Yes Replace the outdoor main PCB
No
Yes Stop the unit
Ensure that the outdoor unit
No
ventilate is working properly
Refer to the solution to the
malfunction of fan speed being out
of control. Find the cause and
resolve the issue
Yes Clean the heat exchanger
Recycle the overcharged
Yes
refrigerant
Reconnect the
power wiring
Reconnect L and N
Reconnect the
bridge rectifier
Is the bridge rectifier
functioning normally?
Yes
Replace the PFC module (if this has not
been done already)
No
Is the wiring of the
reactor or inductance
properly wired?
Yes
Are the reactor and
inductance functioning
normally
Yes
120
Yes
Replace the bridge
No
rectifier
Reconnect the
No
wiring
Replace reactor or
No
inductance