41
Installation and Maintenance
Service Manual
33
DC power source is
short circuited
□
■
□
■
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, all
loads stop operation.
34
Limit/decrease
frequency due
to high module
temperature
■
■
■
☆
All loads operate normally,
and operating frequency of
compressor decreases.
1. Check whether the ventilation of radiator is
abnormal;
2. After the whole unit is de-energized for 20min,
check whether the thermal grease on IPM modular
of outdoor unit's control board is dry; check whether
the radiator is tightened;
3. Otherwise please replace the control board of
outdoor unit.
35
Switch error of
4-way valve
■
□
☆
□
If this error occurs under
heating mode: all loads stop
operation.
1. Power voltage is less than AC175V
2. Wiring terminal 4V is loosen or broken
3. 4V is damaged; replace 4V
36
Zero-crossing
malfunction of
outdoor unit
■
■
☆
□
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Replace control board of outdoor unit
37
Malfunction of DC
fan motor of outdoor
fan motor
■
□
□
□
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Connection wires of DC fan and outdoor unit is
loose; If there’s no malfunction, replace the control
boar
38
Electric level is
abnormal
■
■
☆
■
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
The resistance is damaged or short-circuited,
otherwise please replace the control board.
39
Offset voltage of
PFC current is
wrong
■
☆
□
□
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Replace control board of outdoor unit.
40
Malfunction of
middle temperature
sensor for outdoor
unit
■
■
☆
☆
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Middle temperature sensor is poor connected or
damaged.
41
Overvoltage
□
■
■
☆
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
After commutation, the DC voltage of supply power
is too high.
42
Phase-lacking of
outdoor fan motor
■
□
□
■
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation. During heating
operation, all loads stop
operation.
Phase-lacking of power supply of outdoor fan
motor.
