Carrier 538FEQ009RBGA, Service Manual

Page: 21 / 94

21
No.
Malfunction
Name
Dual-8
Code
Display
Operation
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
AC Status Possible Causes
35 IPM protection H5
OFF 1S
and blink
4 times
During cooling and drying
operation, compressor stops
while indoor fan operate.
During heating operation, the
unit stops operation. Refer to the malfunction analysis
(IPM protection, loss of
synchronism protection and
over-current protection of phase
current for compressor
36
Module
temperature is
too high
H5
OFF 1S
and blink
10 times
37
Internal motor
(fan motor) do
not operate
H6
Internal fan motor, external fan
motor, compressor and
electric heater stop operation,
guide louver stops at present
location.
1. Bad contact of DC motor
feedback terminal.
2. Bad contact of DC motor control
end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circuit.
38
Desynchronizing
of compressor
H7
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops operation. Refer to the malfunction analysis
(IPM protection, loss of
synchronism protection and
over-current protection of phase
current for compressor.
39 PFC protection HC
OFF 1S
and blink
14 times
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
unit stops operation.
Refer to the malfunction analysis
40
Outdoor DC fan
motor
malfunction
L3
OFF 1S
and blink
14 times
Outdoor DC fan motor
malfunction lead to
compressor stop operation. DC fan motor malfunction or
system blocked or the connector
loosened.
41 power protection L9
OFF 1S
and blink
9 times
Compressor stops operation
and Outdoor fan motor stops
30s later, 3 minutes later fan
motor and compressor restarts
To protect the electronic
components when detect high
power
42
Indoor unit and
outdoor unit
does not match
LP
OFF 1S
and blink
16 times
Compressor and Outdoor fan
motor can not work Indoor unit and outdoor unit does
not match
43 Failure start- up LC
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
unit stops operation.
Refer to the malfunction analysis
44
Malfunction of
voltage dropping
for DC bus-bar
U1
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
unit stops.
Replace outdoor control panel AP1
45
Malfunction of
voltage dropping
for DC bus-bar
U3
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
unit stops.
Supply voltage is unstable
46
Malfunction of
complete units
current detection
U5
During cooling and drying
operation, compressor stops
while indoor fan operates;
during heating operating, the
unit stops operation.
There is a circuit malfunction on
outdoor units control panel AP1,
replace the outdoor units control
panel AP1.
47
The four-way
valve is
abnormal
U7
If this malfunction occurs
during heating operation, the
unit will stop operation.
1.Supply voltage is lower than
AC175V;
2.Wiring terminal to the four way
valve is loose or broken;
3.four way valve is damaged,
replace four way valve.
48
Zero-crossing
malfunction of
outdoor unit
U9
During cooling operation,
compressor stops while indoor
fan operates; during heating,
the complete unit stops
operation.
Replace outdoor control panel AP1
49
Frequency
limiting (power)
OFF 1S
and blink
13 times
50
Compressor
running
OFF 1S
and blink
once
51
The temperature
for turning
on the unit is
reached
OFF 1S
and blink
8 times
52
Frequency
limiting (module
temperature) OFF 1S
and blink
11 times
53
Normal
communication
OFF 0.5S
and blink
once
54 Defrosting
OFF 3S
and blink
once
(during
blinking,
ON 10s
and OFF
0.5s)
Defrosting occurs in heating
mode. Compressor operates
while indoor fan stops
operation.
It is the normal state