Samsung MH020FPEA Service Manual page 39

Alignment and Adjustments
3-1-2 Outdoor Unit
Display
Communication error (indoor unable to receive data)
Communication error (outdoor unable to communicate)
Indoor unit room temperature sensor error (Open/Short)
Indoor unit heat exchanger in temperature sensor error (Open/Short)
Indoor unit heat exchanger out temperature sensor error (Open/Short)
Indoor unit sensor error - Evaporator pipe in sensor detached
Indoor unit sensor error - Evaporator pipe out sensor detached
Indoor unit heat exchanger in & out temperature sensor detached
More than 2 indoor units cool and heat simultaneously
The number of indoor unit mismatched
Communication error (outdoor unable to receive data)
Communication error between 2 microcontroller on the outdoor PCB
Outdoor temperature sensor error (Short/Open)
– Error level : over 4.9V(-50˚C) under 0.4V(93˚C)
Condenser temperature sensor error (Short/Open)
– Error level : over 4.9V(-50˚C) under 0.4V(93˚C)
Condenser temperature sensor detached
Compressor discharge sensor error (Short/Open)
– Error check condition : outdoor temperature over -20˚C
– Error level : over 4.95V(-30˚C) under 0.5V(151˚C)
Compressor discharge sensor detached
Compressor OLP sensor error (Short/Open)
– Error check condition : outdoor temperature over -20˚C
– Error level : over 4.95V(-30˚C) under 0.5V(151˚C)
Indoor unit heat exchanger freezing and compressor stop (cooling mode)
Outdoor unit overload and compressor stop (protection control in heating mode)
Outdoor unit high discharge temperature and compressor stop
(protection control in heating mode)
3-5
Explanation Main checking Point
Communication cable
connection
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit operation
mode
Communication wiring
Communication wiring
Outdoor unit PCB
Temperature sensor
Temperature sensor
Temperature sensor
Temperature sensor
Temperature sensor
Temperature sensor
Check pipe matching
also(indoor-outdoor)
Check pipe matching
also(indoor-outdoor)
Check pipe matching
also(indoor-outdoor)
Samsung Electronics