Four Way Valve Abnormality - Daikin 2MXS-N Series Service Manual

Troubleshooting for Outdoor Unit

7.11 Four Way Valve Abnormality

EA
Error Code
Outdoor Unit LED A
Display
Method of Error The liquid pipe thermistor and the outdoor heat exchanger thermistor are checked to see if they
function within their normal ranges in the operating mode.
Detection
Error Decision A following condition continues for A seconds after the compressor has started.
Conditions
A (seconds)
Tde: outdoor heat exchanger temperature
Supposed
Causes
150
j i h h h
1 2 3 4
Cooling
240
Cooling operation
The lowest liquid pipe temperature among the rooms in operation –Tde > 45°C (81°F)
Heating operation
The highest liquid pipe temperature among the rooms in operation –Tde < 0°C (0°F)
Disconnection of four way valve coil
Defective four way valve, coil, or harness
Defective outdoor unit PCB
Defective thermistor
Refrigerant shortage
Water mixed in refrigerant
Defective stop valve
h
5
Heating
1
SiUS121502E
Service Diagnosis