11. Fault code P6: IPM power board safety shutdown
Is the voltage range
between P and N of
the IPM module OK?
Ensure the correct
supply voltage
Yes
Is the input voltage
between P and N of
the IPM module 230V
/ the frequency 50 Hz?
4-way valve
Temperature
Resistance Measuring point
20 °C
1.5 k
Ω
Blue - Blue
Heating mode 0V AC
Cooling mode 230V AC
Note:
No
No
Are all the electrical
cables properly
connected?
Is the single-phase
bridge OK?
Take a measurement
with a multimeter
between “+” and the
two AC contacts and
between “-” and the
two AC contacts. Is the
resistance for the two
measurements 0
Ω
?
Are the connecting
cables to the chokes
OK? Is the resistance of
the connecting cables
∞
?
Check the fuses on the
power board. Are they
working OK?
Replace the
power board
Yes
Is the connection
between the main board
and IPM module OK?
No
Is the connection to the
compressor OK?
Establish a proper
connection
Yes
No
Establish a proper
connection
Replace IPM module.
Is fault still present?
Replace single-phase
bridge circuit
Replace connecting
cables
Yes
Replace main board.
Is fault still present?
Replace compressor.
Is fault still present?
Yes
Yes
Yes
No
No
Connect cables
properly
Is fault still present?
Yes
Yes
Yes
No
Yes
Replace the defective
fuse
No
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