Haier HBU-18HF03 Manual page 235

Electric control functions
auto-restart mode, if shutoff and power again, the system will run in the original state before been
shuttoff. The following information will be memorized: ON/OFF, running mode (AUTO, HEAT, COOL,
DRY, FAN), fan speed (AUTO, MANUAL(HIGH, MED, LOW)), the set temperature (16℃-30℃) and
HEALTH, while the louver position, TIMER, SLEEP and CLOCK will not be memorized. Press SLEEP
button 10 times again, the buzzer will sound 2 times and auto-restart function is cancelled.
3.7.8 Auto check function
Short connect the emergency switch before being electrifed, after being electrified, 10 seconds later, it
will enter auto-check circuit. Before auto-check, please ensure the input values (sensor, pressure switch)
normal, or the buzzer will sound 5 times to show there is abnormal; all the ports will output as the
following sequence: run lamp-timer lamp-electric heater-water pump/pump
lamp-compressor/compressor lamp-(outdoor motor-4-way valve) –HIGH speed-MED speed-LOW
speed-swing-HEALTH ; after the auto-check is finished, the buzzer sounds once.
3.8 System protection
3.8.1 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.
3.8.2 Anti-current rush
2 seconds later after compressor is running, outdoor motor can work.
3.8.3 Sensor failure
Indoor ambient temperature sensor: Mainboard checks that the sensor is in open circuit, short circuit or
close to short circuit for 2 minutes continuously, 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.
Indoor coil temperature sensor: Mainboard checks that the sensor is in open circuit, short circuit or close
to short circuit for 2 minutes continuously, 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.
Shield indoor coil temperature sensor failure in 3 minutes before compressor start and dring defrost
procedure(include defrost finish and quit).
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