U7-00" - Transmission Outdoor Unit-Outdoor Unit Abnormality; Ua-00" - Improper Combination Of Indoor Unit And Outdoor Unit - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting
Possible cause
Wiring abnormality between indoor unit
and outdoor unit.
Faulty outdoor unit main PCB.
Faulty outdoor fan motor.
Faulty indoor unit main PCB.
More info:
Check procedures
"Main PCB" on page 53
"Fan motor" on page 51
2.2.3.4. "U7-00" – Transmission outdoor unit-outdoor unit abnormality
Trigger
Communication abnormality between out-
door unit PCB's.
Possible cause
Faulty wiring between outdoor unit PCBs.
Faulty outdoor unit main PCB.
Faulty outdoor inverter PCB.
More info:
Check procedures
2.2.3.5. "UA-00" – Improper combination of indoor unit and outdoor unit
Trigger
Signal transmission between indoor unit
and outdoor unit abnormality.
Page 40
RA R32 Split & multi split M-Series
Check
Check wiring between indoor unit and out-
door unit.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Check the fan motor.
Check fan motor connections and wiring.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the indoor main PCB receives
power.
Replacing procedures
"Replacing main PCB" on page 84
"Replacing DC fan motor assembly" on page 79
Effect
Unit will stop operating.
Check
Check wiring between outdoor unit PCBs.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Check outdoor inverter PCB.
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Replacing procedures
"Replacing main PCB" on page 84
Effect
Unit will stop operating.
2.2. Error based troubleshooting
Corrective action
Adjust wiring between indoor unit and out-
door unit when required.
Replace wiring between indoor unit and
outdoor unit when required.
Restore the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Replace fan motor when required.
Adjust wiring when required.
Restore the power to the indoor main
PCB.
Replace indoor main PCB when HAP LED
is not blinking in regular intervals.
Reset
Manual reset via user interface.
Corrective action
Adjust wiring between outdoor unit PCBs
when required.
Adjust the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB.
Reset
Power reset via outdoor unit.
4/04/17 | Version 1.1