High Work-Intense Protection - Haier HSU-18HEA03/R2(DB)-I Service Manual

7.3.9 High work-intense protection

Outdoor display
Method of High work-intense control is activated in the heating mode if the temperature being sensed
Malfunction by the heat exchanger thermistor exceeds the limit.
Detection
Malfunction Activated when the temperature being sensed by the heat exchanger thermistor rises above
Decision 68
Conditions
Supposed
Causes
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, 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?
measure whteher the pressure of the system
is too high
HSU-18HEA03/R2(DB)-I
LED1 flash 21 times
twices in 30 minutes.
Faulty electronic expansion valve
Dirty heat exchanger
Faulty heat-exchange sensor
Insufficient gas
else parts damage may be occurred.
NO
NO
YES
Check room temperature and
pipe temperature sensor.
YES
1) Clean the filters
2) Reinstall the fan.
YES
The system is over charged
with gas
68
Service Diagnosis
or
Domestic air conditioner