Haier 1U12BE2ERA Service Manual page 53

11.4.12 High work-intense protection
Outdoor diplay
Method of
malfunction detection
Malfunction detection
conditions
Supposed causes
Troubleshooting
Electrify the machine again and turn it on with the
remote controller,
temperature is below 149°F
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，
LED1 flash 21 times
High work-intense control is activated in the heating mode if the temperature being
sensed by the heat exchanger thermistor exceeds the limit.
Activated when the temperature being sensed by the heat exchanger rises above
149°F twice in 30 minutes.
■Faulty electronic expansion valve
■Dirty heat exchanger
■Faulty heat-exchange sensor
■Insufficient gas
* Caution
Be sure to turn off power switch before connect or disconnect connector,
parts damage may be occurred.
check whether the wind
NO
NO
1 、 Check room temperature and
pipe temperature sensor.
YES
2、 the temperature monitoring circuit
of the indoor mainboard
1) Clean the filters
YES
2) Reinstall the fan.
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Domestic air conditioner