Haier 1U50KEPFRA-H Service Manual page 51

10.4.12 High work-intense protection
Outdoor display
E 9 LED1 flash 21 times
High work-intense control is activated in the heating mode if the temperature
Method of
being sensed by the heat exchanger thermistor exceeds the limit.
Malfunction
Detection
Malfunction
Activated when the temperature being sensed by the heat exchanger
rises above 65℃ twice in 30 minutes
Decision
Conditions
■ Faulty electronic expansion valve
■ Dirty heat exchanger
Supposed
Causes ■ Faulty heat-exchange sensor
■ Insufficient gas
Trouble
* Caution:
shooting
Electrify the machine again and turn it
on with the remote control, check
whether the wind temperature is below
65℃
The malfunction is reported
after the machine has run
for some time?
The indoor unit blows
poorly due to blocked
filters or poor condition of
the fan?
Use some tools to measure the pressure of system
Be sure to turn off power switch before connect or disconnect connector, or
parts damage may be occurred.
NO
NO
51
Check room temperature and pipe
YES
temperature sensor.
Monitor the temperature of indoor
PCB circuits.
YES
Clean the filters
Reinstall the fan.
Service Diagnosis