Lennox LNINVE052 Service Manual page 33

Service Manual
(9) Compressor overload protection (indoor unit displays H3 in cooling, heating or dry mode)
① If disconnection of compressor overload switch is detected for 3S continuously, the system will stop for compressor overload
protection; when the protection is eliminated and the compressor has stopped for 3min, the unit will resume running;
② If unit stopping for compressor overload protection continuously occurs for three times, the unit can not resume running automatically
and you should press ON/OFF button on remote controller to resume running; the times of compressor overload protection will be
cleared if the compressor has run for 30min.
(10) Overcurrent protection (indoor unit displays E5 in cooling, heating or dry mode)
If overcurrent is detected for 3s continuously, the system will stop for overcurrent protection; when the protection is eliminated and the
compressor has stopped for 3min, the unit will resume running.
(11) Temperature sensor malfunction detection (indoor unit displays F1, F2, F3, F4, F5 in cooling, heating, dry or fan mode)
① Malfunction of indoor ambient temperature sensor: indoor unit displays F1, which means indoor ambient temperature sensor is open-
circuit or short-circuit, or its detection circuit element is broken;
② Malfunction of indoor evaporator temperature sensor: indoor unit displays F2, which means indoor evaporator temperature sensor is
open-circuit or short-circuit, or its detection circuit element is broken;
③ Malfunction of outdoor ambient temperature sensor: indoor unit displays F3, which means outdoor ambient temperature sensor is
open-circuit or short-circuit, or its detection circuit element is broken;
④ Malfunction of outdoor condenser temperature sensor: indoor unit displays F4, which means outdoor condenser temperature sensor is
open-circuit or short-circuit, or its detection circuit element is broken;
⑤ Malfunction of outdoor discharge temperature sensor: indoor unit displays F5, which means outdoor discharge temperature sensor is
open-circuit or short-circuit, or its detection circuit element is broken.
When temperature sensor malfunction occurs, the unit stops for protection.
Technical Information
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