Westinghouse WHU09CTA21S, Service Manual, Page: 44 / 90

Table 4 Drive Fault Code (24K/36K)
Fault
code
Fault description
Possible reason s for abnormality
How to deal with
1
Q axis current
detection, failure in
drive control
1. C ompressor wire is not connect ed
properly ;
2. Bad driver board components;
3. Compressor start load is too large;
4. Compressor demagnetization;
5. The c ompressor is short of oil, and
the crankshaft is worn seriously ;
6. The compressor insulation fails.
1. Check the compressor wire;
2. Change the driver board ;
3. Turn on the unit after the
pressure is balance d again;
4. Change the c ompressor;
5. Change the c ompressor;
6. Change the c ompressor.
2
Phase current detection,
failure in drive control
1. Compressor voltage default phase;
2. Bad driver board components;
3. The compressor insulation fault .
1. Check the compressor wire connection;
2. Change the driver board;
3. Change the Compressor.
3
Initialization, phase
current imbalance
Bad driver board components. Change the driver board .
4
Speed estimation,
failure in drive control
1. Bad driver board components;
2. Compressor shaft is clamp ed ;
3. The compressor insulation fa ils .
1. Change the driver board ;
2. Change the Compressor ;
3. Change the Compressor .
5 IPM FO output fault
1. System overload or current
overload s .
2. Driver board fa ils ;
3. The compressor is short of oil, and
the crankshaft is worn seriously;
4. The compressor insulation fault.
1. Check the air conditioner system;
2. Change the driver board;
3. Change the Compressor;
4. Change the Compressor.
6
Communication
between driver board
and control board fault
1. Communication wire connect ion
is not well;
2. Driver board fault;
3. Control board fault .
1. Check the compressor wire connect.
2. Change the driver board;
3. Change the control board ;
7
AC voltage,overload
voltage
1. Supply voltage input is too high or
too low;
2. Driver board fa ils ;
1. Check the power supply;
2. Change the driver board;
8
DC voltage,overload
voltage
1. Supply voltage input is too high ;
2. Driver board fault;
1. Check the power supply;
2. Change the driver board;
9 AC voltage imbalance Driver board fa ils ; Change the driver board;
10
The PFC current
detection circuit fault
before compressor is
ON
Bad driver board components . Change the driver board .
11
AC voltage supply in
outrange
1. Power supply is abnormal, power
frequency is out of range;
2. Driver board fa ils ;
1. Check the system;
2. Change the driver board;
12
Products of
single-phase PFC
over-current, FO
output at low level
1. System overload, current is too large;
2. Driver board fault;
3. PFC fault.
1. Check the system;
2. Change the driver board;
3. Change PFC.
Inverter over current
(3-phase power supply
air conditioners)
1. System overload, current is too large;
2. Driver board fault;
3. The compressor is short of oil, and
the crankshaft is worn seriously;
4. The compressor insulation fault.
1. Check the system;
2. Change the driver board;
3. Change the Compressor;
4. Change the Compressor.
13 Inverter over current
1. System overload, current is too large;
2. Driver board fault;
3. The compressor is short of oil, and
the crankshaft is worn seriously;
4. The compressor insulation fault.
1. Check the system;
2. Change the driver board;
3. Change the Compressor;
4. Change the Compressor.
14
PFC over
current(single phase
air-conditioner)
1. System overload, current is too large;
2. Driver board fault;
3. PFC fault.
1. Check the system;
2. Change the driver board;
3. Change PFC.
Phase imbalance or
phase lacks or the
instantaneous power
failure (only for
3-phase power supply
air conditioners)
1.3-Phase voltage imbalance;
2. The 3-phase power supply phase
lost;
3. Power supply wiring is wrong;
4. Driver board fault.
1, Check the power supply;
2. Check the power supply;
3. Check the power supply wiring connect;
4.Change the driver board.
15
The instantaneous
power off detection
1. The power supply is not stable ;
2. The instantaneous power failure ;
3. Driver board fault .
1. Check the power supply;
2. Not fault;
3. Change the driver board.
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