Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
71
10.2 Failure code
The remote receiver, wired controller and indoor PCB indicator all can indicate the failure code.
10.2.1 Failure code list
Power lamp flash
times/LED on PCB
flash times
failure description reasons treatment
1 Indoor ambient temp.
sensor failure
sensor broken down or short
circuit for more than 2m
continuously
due to the
signal,resumable
2 Indoor pipe temp.
sensor failure
sensor broken down or short
circuit for more than 2m
continuously
due to the
signal,resumable
4 Outdoor pipe temp.
sensor failure
sensor broken down or short
circuit for more than 2m
continuously
due to the
signal,resumable
8 Communication failure
between panel and
indoor unit
communication abnormal for
more than 4m continuously
due to the
signal,resumable
16 Low pressure
malfunction
low pressure switch acts for
30m
Need to be checked,
reset
10.2.2 Sensor malfunction
If indoor ambient temp. sensor and indoor pipe temp. sensor are valid, there is no outdoor sensor, in
the following conditions, the unit will confirm the sensor is failure:
Mainboard checks that the sensor is in open circuit, short circuit or close to short circuit continuously
for 2 minutes, the mainboard will confirm that sensor is failure, the system will stop running, alarm
occurs; If the signal is resumed, the system will resume automatically.
If indoor ambient temp. sensor and indoor pipe temp. sensor is valid, also there is outdoor sensor, in
the following conditions, the unit will confirm the sensor is failure:
Mainboard checks that the outdoor pipe temp. sensor is in open circuit, short circuit or close to short
circuit continuously for 2 minutes, the mainboard will confirm that sensor is failure, the system will
stop running, alarm occurs; If the signal is resumed, the system will resume automatically.
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