34
Technical Information
Service Manual
delay 2 mins to be closed.
(5) System high pressure protection (applicable for cooling,
heating, drying and auto mode)
When system high pressure protection is detected by the
controller, all loads stop except IDU fan motor in cooling and
drying mode; all loads stop in heating mode; button and remote
control signals are shielded and E1 is displayed. When system
high pressure protection is eliminated, button and remote control
signals are available.
(6) Compressor low pressure protection (applicable for
cooling, heating, drying and auto mode)
When compressor low pressure protection is detected by the
controller, the system stops; button and remote control signals
are shielded and E3 is displayed. When compressor low
pressure protection is eliminated, button and remote control
signals are available.
(7) Indoor high temperature protection (applicable for
heating and auto mode)
When IDU fan motor is in turbo or high fan speed and Ttube ≥
56°C, ODU fan motor stops operation; when Ttube ≤ 49°C, ODU
fan motor starts operation again.
When IDU fan motor is in medium or low fan speed and Ttube ≥
52°C, ODU fan motor stops operation; when Ttube ≤ 46°C, ODU
fan motor starts operation again.
(8) Temperature sensor malfunction protection (applicable
in cooling, heating, drying fan or auto 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.
6. Function and Control
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