Hokkaido HKEN-HCNN 642XR, Service Manual

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3. Forced Cooling: When receiving indoor forced cooling signal, cooling operation will start
in a frequency signaled by indoor unit. Only air discharge temperature and overcurrent protection
features are effective and other protection features are invalid.
4. Rated, Middle and Minimum Capacity Operation: When receiving indoor, rated, middle
and minimum capacity operation signal, outdoor unit will operate as per wind speed and
frequency set by EEPROM and all the protection features are effective.
Three. Fault Display and Treatment
z In case outdoor unit faults, the alarm indicator lamp will blink and blink frequency is 1HZ ，
Time interval between blink cycles is 3s.
z Alarm indicator lamp is off when there is no fault.
z Three are three ways of fault alarm.
It is ensured that fault alarm indicator lamp will blink for more than 2 minutes and 30s each
time.
（ 1 ） : Resumable Alarm, fault code is sent to indoor unit.
（ 2 ） : Resumable Alarm ， if there are 3 consecutive non-resumable fault codes in 10 minutes,
it need to restart by cut off the power.
Classic Line Air Conditioner
Model: HKEN-HCNN 642 XR