Haier N Series Service Manual page 63

. .12 High work-intense protection
Outdoor display
Method of
malfunction detection
Malfunction detection
conditions
Conditions
Supposed
Causes
Troubleshooting
Electrify the machine again and turn it on with the
remote
temperature is below 65
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 65 twices 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,
else parts damage may be occurred.
controller, check whether
The malfunction is reported
after the machine has run
for some time?
NO
The indoor unit blows poorly
due to blocked filters or poor
condition of the fan?
NO
the wind
1
YES
pipe temperature sensor.
2 the temperature monitoring circuit
of the indoor mainboard
YES
1) Clean the filters
2) Reinstall the fan.
Service diagnosis
Check room temperature and
Domestic air conditioner
or