Fisher FSKIF-121AE2-EU Service Manual page 153

2.4.4.12. P0 malfunction
At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or
close to 0, the IPM is defective. Otherwise, please follow the procedure below:
P0
P6 display
IPM module protection
No
Check whether the power voltage
is normal.
Yes
Measure whether outdoor terminal
voltage is normal？
Yes
Measure whether the voltage
between L and N is normal？
Yes
Measure whether input voltage of
bridge rectifier is normal？
Yes
Measure whether the voltage
between P and N is normal
refer to the Appendix 3？
Yes
Check whether the connecting
wire between main board and the
IPM board is connected tightly
Yes
Check whether the connecting
wire of the compressor is
connected correctly or tightly
Yes
Check if the outdoor unit
ventilation is good
Yes
Check if the outdoor fan runs
properly
Yes
Replace IPM board
No
Replace the outdoor main PCB
No
Check the compress is
normal
Yes
Check whether the refrigerant system is ok
Electrical Control System
Restart the unit when the power supply
No
Check the wiring of
No power wires well or
correctly
Check the wiring of L
No
and N well or correctly
Check the wiring of
No bridge rectifier well or
correctly
No
No
Reconnect it well
No
Reconnect it well
Make the outdoor unit ventilate well
No
please refer to the solution of fan speed
No has been out of control malfunction .
Find out the cause and have it solved.
No Replace the compressor
gets normal
Reconnect it well
Reconnect it well
Reconnect it well
Check whether bridge
rectifier is normal
Yes
Replace the PFC module(If has)
No
Check the wiring of reactor
or inductance
Yes
Check whether reactor or
inductance is normal
Yes
Troubleshooting
No Replace the bridge rectifier
No Reconnect the wiring
Replace reactor or
No
inductance
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