Haier HDU-60CA03T3 Service Manual page 30

electrified after being powered off, the protection will be cancelled.
3 System protection
3.1 3-minute protection for compressor startup
After the compressor stops, at least 3 minutes later, the compressor can restart up; if the unit is
powered off in running, after being electrified, 3 minutes later, the compressor can restart up. Being
electrifed for the first time, there is 3-minute delay protection.
3.2 Failure code
The remote receiver, wired controller and indoor PCB indicator all can indicate the failure code.
Failure code list
Failure Power lamp flash
code on times/LED on
panel PCB flash times
1
E1
E2 2
E3 3
4
E4
5
E5
E6 6
8
E8
E9
9
10
E0
E6 16
3.3 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
Commercial Air Conditioner
failure description
Indoor ambient temp. sensor broken down or short circuit
sensor failure for more than 2m continuously
Indoor pipe temp. sensor broken down or short circuit
sensor failure for more than 2m continuously
Outdoor ambient sensor broken down or short circuit
temp. sensor failure for more than 2m continuously
Outdoor pipe temp. sensor broken down or short circuit
sensor failure for more than 2m continuously
overcurrent Detected current is above the limit
when run
High pressure High pressure switch acts 3 times in
malfunction 30m
Communication communication abnormal for more
failure between panel than 4m continuously
and indoor unit
Communication communication abnormal for more
failure between indoor than 4m continuously
and outdoor unit
Fault in drain system Float switch is open for more than
5m continuously
Low pressure low pressure switch acts for 30m
malfunction
30
reasons treatment
due to the signal,
resumable
due to the signal,
resumable
due to the signal,
resumable
due to the signal,
resumable
Need
checked, reset
Need
checked, reset
due to the signal,
resumable
due to the signal,
resumable
due to the signal,
resumable
Need
checked, reset
to be
to be
to be