Part 5 – Diagnosis and Troubleshooting
5.16 H7 Troubleshooting
Digital display output
Procedure
Power supply voltage is not within ±10%
of rated voltage or a phase is missing(for
3 phase model)
Provide normal power supply
Wires between main PCB, AC filter board
(for 3 phase model) and electric control
box power supply terminals are loose
Ensure the wires are connected properly
Set a multi-meter to buzzer mode and test
any two terminals of P N and U V W of the
inverter module. The buzzer sounds.
Replace the inverter module PCB.
The normal resistances of the fan motor
are 29.9-36.7Ω among U V W and infinite
between each of U V W and ground. Any
of the resistances differ from these
specifications.
The normal resistances of the inverter
compressor are 1.5-2.5Ω among U V W
and infinite between each of U V W and
ground. Any of the resistances differ from
these specifications.
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