C4-00" - Liquid Pipe Thermistor For Heat Exchanger Abnormality; C7-00" - Front Panel Open/Close Fault; C9-00" - Suction Air Thermistor Abnormality - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting
2.2.1.5. "C4-00" – Liquid pipe thermistor for heat exchanger abnormality
Trigger
Thermistor input is > 4.96 V or < 0.04 V
during compressor operation.
Possible cause
Faulty liquid pipe thermistor.
Faulty indoor unit main PCB.
More info:
Check procedures
"Refrigerant thermistors" on page 56
2.2.1.6. "C7-00" – Front panel open/close fault
Trigger
Shutter limit switch not activated or faulty.
Possible cause
Foreign substance in the blow port.
Faulty shutter limit switch.
Faulty wire harness.
Faulty shutter motor.
Faulty shutter sealing.
Shutter is deformed.
2.2.1.7. "C9-00" – Suction air thermistor abnormality
Trigger
Resistance value is out of range.
T measured < -43.6°C or > 90°C.
4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
Effect
Unit will stop operating.
Check
Check liquid pipe thermistor.
Check if error still occurs after turning off
power and turning it back on again.
Check if the indoor PCB receives power.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check the wiring to indoor PCB.
Replacing procedures
Effect
Unit will stop operating when error occurs
2 times.
Check
Check blow port for foreign material.
Check the limit switch continuity.
Check the wire harness wiring.
Check the wire harness connection.
Check if motor operates after opening the
shutter and power reset.
Check if shutter goes back open automat-
ically after closing.
Check if the error is still active after clos-
ing the shutter.
Effect
Unit will stop operating.
2.2. Error based troubleshooting
Reset
Power reset via outdoor unit.
Corrective action
Replace liquid pipe thermistor when
required.
Adjust the power to the indoor main PCB.
Replace indoor main PCB when HAP LED
is not blinking in regular intervals.
Reset
Power reset via outdoor unit.
Corrective action
Remove foreign material when required.
Replace the limit switch when continuity is
not good.
Reconnect wire harness when required.
Perform a power reset, if shutter valve
does not close after power reset, replace
wire harness.
Replace indoor unit main PCB when
required.
Replace sealing material when required.
Replace shutter panel when required.
Reset
Automatic reset when resistance is within
range.
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