Service manual

16-5
TROUBLESHOOTING > GC 24
SM HADDCI 1-A.2 GB
16.3.2 Outdoor fault corrective actions
No Fault Name Probable Cause Corrective Action
1 OCT bad
Thermistor not connected or
damaged
Check Thermistor
2 CTT bad
3 HST bad
4 OAT bad
5 TSUC bad
6 RGT bad
7 OFAN/Compressor
Feedback Loss
OFAN halls or wires bad.
Compressor wire cable bad or
IPM bad or compressor bad
Check OFAN motor and
compressor
8 OFAN - IPM fault Over current / Over temperature
of OFAN IPM
Check no obstruction to
controller air opening
Check OFAN motor
Check motor type matches
motor jumpers in controller
9 OFAN Lock Fan does not rotate Check OFAN motor
10 OFAN- Vospd
exceeded
Exceeds speed high limit Check motor type matches
motor jumpers in controller
Make necessary arrengments in
unit installation location to avoid
back wind
Avoid EMC problems
11 Compressor- IPM
Fault
Over current / Over temperature
of compressor IPM
Check no obstruction to
controller air opening
Check Compressor
12 Compressor Lock Compressor does not rotate Check Compressor
13
Compressor- Vospd
exceeded
Exceeds speed limit
Try again and replace controller
if still have the problem
14
Compressor-
Foldback
High pressure / Current reduces
compressor speed
Check Compressor
15 DC under voltage DC voltage is lower than limit Replace controller
16 DC over voltage DC voltage exceeds its high limit Check if input voltage higher
than limit (270VAC), if not and
the problem presist, replace
controller. If voltage is high, shut
off the power and recommend
the customer to fix the power
supply
17 AC under voltage AC input voltage is lower than
limit
Check if input voltage lower
than limit (170VAC), if not and
the problem presist, replace
controller. If voltage is low,
recommend the customer to fix
the power supply
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