Daikin 2MXS-N Series Service Manual page 155

SiUS121502E
Troubleshooting
Check No.01
Refer to P.166
Check No.12
Refer to P.169
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the wiring and piping.
Wrong wiring or
piping?
NO
Check No. 12
Check the electronic expansion
valve.
Functioning?
YES
Check No. 01
Check the outdoor heat
exchanger thermistor.
As described in
the thermistor
characteristic
chart?
YES
Check No. 01
Check the room temperature
thermistor.
As described in
the thermistor
characteristic
chart?
YES
Change the refrigerant to remove
moisture from the piping (after
drawing a vacuum).
Error again?
YES
YES
NO
NO
NO
NO
Troubleshooting for Outdoor Unit
Activate the wiring error check
function.
Replace the electronic
expansion valve or coil.
Replace the outdoor heat
exchanger thermistor.
Replace the room temperature
thermistor.
Replace the indoor unit PCB
(control PCB) and then start
the wiring error check function.
Replace the room temperature
thermistor or indoor heat
exchanger thermistor.
Do the vacuum drying.
(R21923)
143