Haier AU282AHBEA Service Manual page 222

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Over current protection is valid.
No load protection is valid.
Outdoor cooling overload protection is valid.
8.2.8 Others
8.2.8.1 Sensor short/open circuit
The failure code will display at two types:display board can display 9 kinds of failure code (refer to the
appendix); LED indicator on indoor PCB flash times will show indoor/outdoor failure code (refer to the
appendix).
In operation, if any sensor is in short/open circuit, the display board will display failure code, outdoor unit
will stop. In Timer On state, if any sensor is short/open, though the timer clock arrives, the unit still does
not start up, and show the failure code.
8.2.8.2 No load
If compressor frequency≥56Hz, and at this time, the voltage<0.024V, then unit will stop.
8.2.8.3 Higher/lower voltage protection
If the power voltage is over 270V or lower than 130V, the unit will occur failure, outdoor unit will shut off.
8.2.8.4 3-minute protection
After compressor stops, only 3 minutes later the compressor can re-start up.
8.2.8.5 High pressure protection
After compressor is running for 5 minutes, the unit will check the pipe pressure, when the pipe pressure is
too high, 15 seconds later, compressor and outdoor fan motor will stop, and then 3 minutes later, the unit
will be normal.
8.2.8.6 Low pressure protection
In any case except for defrost (after compressor runs for over 5 minutes), the unit will check the low
pressure protection, if there is, 15 seconds later, compressor and outdoor fan motor will stop, and then 3
minutes later, the unit is normal. Within 30 minutes, if the compressor stops because of too high pressure
for 3 times, the system will shut off. In shutoff, it will send failure code 08 to indoor unit.
8.2.8.7 Frequency limitation of compressor operation
temp. difference>4, permitted max. frequency: cool 108, heat 120, dehumification 108
temp. difference=4, permitted max. frequency: cool 96, heat 116, dehumification 96
temp. difference=3, permitted max. frequency: cool 80, heat 96, dehumification 80
temp. difference=2, permitted max. frequency: cool 64, heat 80, dehumification 60-32 in turn
temp. difference=1, permitted max. frequency: cool 48, heat 64, dehumification 60-32 in turn
temp. difference=0, permitted max. frequency: cool 15, heat 32, dehumification 60-32 in turn
temp. difference=-1, permitted max. frequency: cool 15, heat 32, dehumification 60-32 in turn
temp. difference=-2, permitted max. frequency: cool 0, heat 0, dehumification 0
8.2.8.8 Oxygen generator function
In all modes, the oxygen generator function is valid: non-standby mode, press "oxygen" button, run the
function directly, and the running mode will not change. In standby state, press "oxygen" button, run the
function, while the outdoor motor will work at Low speed.
8.2.8.9 2-way valves of indoor and outdoor respond
When the state changes, indoor 2-way valve will respond 50 seconds later after the unit stops, the
outdoor 2-way valve will respond when the state has been changed and the compressor starts up.
8.2.8.10 Frequency limitation display when compressor is running
The indicator LED1, LED2, LED3, LED4 on outdoor PCB can display the information of frequency
limitaion.
No Limitaion info Limitaion reason LED4 LED3 LED2 LED1
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