Haier AW07LC2VHA Technical Overview page 109

LED1 flashes 21 times
Activated when the temperature being sensed by the heat exchanger rises above 149°F
twice in 30 minutes
Caution: Be sure to turn power switch off before connecting or disconnecting the
connector, or parts may sustain damage.
Use the remote control to turn on the unit.
Check whether the ambient temperature
is below 149°F
Did the unit malfunction after it had run for
some time?
NO
Is the air flow of the indoor unit weak due to
blocked filters or poor condition of the fan?
NO
Measure system pressure
FLOW CHARTS
YES
Check the room temperature.
Check pipe temperature sensor.
Chek the temperature monitoring circuit of the
YES
REFERENCES
indoor main board.
Clean the filters.
Reinstall the fan.
PAGE 109