13-14
TROUBLESHOOTING
SM LEXDCI 1-E.1 GB
13.2.3.2
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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