COMFORT-AIRE B-SVH24SA-1 Service Manual page 46

9.3.8 Over voltage or too low voltage protection diagnosis and solution (P1)
Error Code
Malfunction conditions
Possible causes
Troubleshooting:
Check the power supply .
OK?
Yes
Check the connections and
wires. OK?
Yes
Check the voltage between
P and N. OK?
Yes
Check the reactor.
OK?
Yes
Replace the reactor
P1
An abnormal voltage rise or drop is detected when checking
the specified voltage detection circuit.
Power supply problems.
●
System leakage or blockage
●
PCB faulty
●
No
No
No
No
P
N
42
Service Manual - SVH 09/12/18/24 Series
Stop the unit
Correct the connections or
replace the wires.
Replace the IPM board
Replace outdoor main PCB
Remark:
Measure the DC voltage
between P and N port. The
normal value should be
around 310V.
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