Service manual

67
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Malfunction display: E3 Compressor Low Pressure Protection
Check if the air return and supply from heat exchanger
of indoor unit and outdoor unit is smooth
Check if indoor unit fan and outdoor unit fan run
Compressor Low Pressure
Protection
Y
N
Check if the pressure is really low pressure
with the measurement of a manometer
Refer to the high pressure
protection
Check if refrigerant in the system is
insufficient
N
Y
Y
Y
Check if operation mode of indoor unit is
properly set
Charge refrigerant according to the amount
specified in the nameplate and calculated
additional amount
Check if gas valve and liquid valve are
completely open
N
N
Refer to Instruction Manual of indoor unit
Completely open the valve
Check if the panel of outdoor unit is
firmly closed ?
Close the panel
Remove the barrier
Measure the fan motor and
signal input
Mainly check the inlet and outlet of main pipe connecting with each indoor unit and
capillary of indoor and outdoor units. Replace the parts like filter, capillary and so on.
N
N
N
System pipeline is blocked
Y
Y
Y
Y
Check if swing louver of indoor unit is
completely open
Measure swing motor and
signal input
Check if there is filth blockage to indoor
/
outdoor
filter or heat exchange fin
Refer to Care and Maintenance
N
N
N
Y
Y
Y
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