Service Diagnosis
Domestic Air Conditioner
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 twices in 30 minutes.
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, or
else parts damage may be occurred.
Electrify the machine again and turn it on with the
remote controller, check whether the wind
temperature is below 65
the malfunction is reported
after the machine has run
for some time?
1 Check room temperature and
pipe temperature sensor.
2
the temperature monitoring circuit
of the indoor mainboard
the indoor unit blows poorly
due to blocked filters or poor
condition of the fan?
1) Clean the filters
2) Reinstall the fan.
Use some tools to measure the pressure of system
YES
NO
YES
NO
59
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