Haier HSU-18LEK03/R2 Service Manual page 61

7.4.12 High work-intense protection
Outdoor display LED1 flash 21 times
Method of High work-intense control is activated in the heating mode if the temperature
Malfunction being sensed by the heat exchanger thermistor exceeds the limit.
Detection
Malfunction Activated when the temperature being sensed by the heat exchanger
Decision rises above 65
Conditions
Supposed ■ Faulty electronic expansion valve
Causes ■ Dirty heat exchanger
■ Faulty heat-exchange sensor
■ Insufficient gas
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
Electrify the machine again and turn it on with the
remote controller,
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
twices in 30 minutes.
else parts damage may be occurred.
check whether the wind
NO
NO
59
1 Check room temperature and
YES
pipe temperature sensor.
2 the temperature monitoring circuit
of the indoor mainboard
YES
1) Clean the filters
2) Reinstall the fan.
Service Diagnosis
Domestic Air Conditioner
or