Lennox LI012HI-210P432 Service Manual page 44

Service Manual
Malfunction
NO.
Name
Malfunction of
phase current
44 detection
circuit for
compressor
Malfunction of
voltage
45
dropping for
DC bus-bar
Malfunction
of complete
46
units current
detection
The four-way
47 valve is
abnormal
Zero-
crossing
48
malfunction of
outdoor unit
49
Defrosting
Undefined
outdoor unit
50
error
Installation and Maintenance
Display Method of Indoor Unit
Indicator Display (during
blinking, ON 0.5s and OFF
Dual-8
0.5s)
Code
Display
Operation Cool Heating
Indicator Indicator Indicator
U1
U3
U5
U7
U9
OFF 3S
and blink
once
(during
blinking,
ON 10s
and OFF
0.5s)
oE
A/C status
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, the compressor will
stop while indoor fan will
operate;
During heating operating,
the complete unit will stop
operation.
If this malfunction occurs
during
heating operation, the complete
unit will stop operation.
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation.
Not the error code. It's the
status code for the operation.
Cool: compressor and outdoor
fan stops operation, while
indoor fan operates; Heat:
compressor, outdoor fan and
indoor fan stop operation.
Possible Causes
Replace outdoor control panel AP1
Supply voltage is unstable
Theres circuit malfunction on
outdoor units control panel AP1,
please replace the outdoor units
control panel AP1.
1.Supply voltage is lower than
AC175V;
2.Wiring terminal 4V is loosened or
broken;
3.4V is damaged, please replace
4V.
Replace outdoor control panel AP1
Its the normal state
1. Outdoor ambient temperature
exceeds the operation range of unit
(eg: less than-20oC or more than
60oC for cooling; more than 30oC
for heating);
2. Failure startup of compressor?
3. Are wires of compressor not
connected tightly?
4. Is compressor damaged?
5. Is main board damaged?
41