Haier MVAH018MV2AA Service Manual page 38

12.8 Anti-freeze protection
In cooling mode, execute the anti-freeze protection due to the measured indoor coil temp. to avoid the indoor heat
exchanger causing frost or ice.
12.9 Swing motor control
Indoor will control swing motor ON/OFF due to the swing signal from wired controller.
12.10 Auxiliary electric heater control
In heating mode, if the below conditions can be met, the electric heater will work:
(1) Indoor fan motor and compressor are running;
(2) Air inlet temp. is no more than 22°C;
(3) Room temp. is lower over 2°C than the set temp.;
(4) Compressor has run for 5 seconds;
Either below condition is met, the electric heater will stop:
(1) Indoor fan motor or compressor not runs;
(2) Indoor air inlet temp. is over 23°C;
(3) Indoor air inlet temp. is higher over -1°C than the set temp.;
(4) Unit stops or quit the heating mode.
12.11 Filter cleaning
Check and memorize the running time of indoor fan motor, once arriving the requested time (set by SW07-6), indoor
will send filter cleaning signal to wired controller; when indoor receives the filter reset signal from wired controller, if
the time exceeds the requested time, the filter will reset.
12.12 Compulsory defrosting
After indoor receives the compulsory defrosting signal from wired controller, it will send compulsory defrosting
signal to outdoor continuously for 10 times. In the sending period, indoor will execute the normal defrost.
12.13 Trial operation
Set the mode as cooling (heating), press ON/OFF for 5 seconds to enter compulsory cooling (heating).
In compulsory cooling, display "LL" and COOL will flash;
In compulsory heating, display "HH" and HEAT will flash, fan speed is AUTO. At this time, only ON/OFF,
TEMP +/- are valid.
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