SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.
SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.
SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.
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3 Error display : e1 [Communication error between remote controller~Indoor unit]<br />
Red LED<br />
Green LED<br />
Indoor unit<br />
Stays OFF<br />
Keeps flashing<br />
Voltage<br />
between X and Z<br />
approximately<br />
10~11 V?<br />
NO<br />
Voltage<br />
fluctuates between<br />
5~11 V between<br />
Y and Z.<br />
YES<br />
Voltage<br />
fluctuates between<br />
5~10 V between<br />
Y and Z<br />
indoors.<br />
YES<br />
Voltage<br />
fluctuates between<br />
5~10 V between<br />
CNB Y and Z.<br />
YES<br />
Indoor unit<br />
resets every ❇<br />
4 minutes.<br />
YES<br />
YES<br />
NO<br />
NO<br />
NO<br />
NO<br />
Red LED<br />
Green LED<br />
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.<br />
Red LED<br />
Green LED<br />
Power supply reset<br />
Normal?<br />
NO<br />
Replacement indoor<br />
unit control PCB<br />
Indoor unit<br />
Stays OFF<br />
Stays OFF or Lights<br />
continuously<br />
Replacement remote<br />
controller<br />
Remote controller<br />
wire disconnection<br />
Terminal block CNB<br />
harness is defective.<br />
Outdoor unit<br />
Stays OFF<br />
Keeps flashing<br />
❇ After the green LED lights up once,<br />
it begins flashing again continuously.<br />
The louver moves once in the<br />
close direction.<br />
YES<br />
Power supply reset<br />
Red LED<br />
Noise<br />
Green LED<br />
Power supply OFF<br />
Outdoor unit<br />
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.<br />
● Only case of FDT<br />
Stays OFF<br />
Is the voltage<br />
between CNW8<br />
2-3 12V?<br />
Lighting YES<br />
Power supply reset<br />
Normal<br />
YES<br />
NO<br />
NO<br />
The unit is normal.<br />
(The malfunction is due to noise, etc.)<br />
Check the CNW5-<br />
CNW8 harness.<br />
Replacement indoor<br />
unit control PCB<br />
- 15 -<br />
Stays OFF<br />
YES<br />
Keeps flashing<br />
Power supply<br />
reset<br />
Normal?<br />
Is the<br />
resistance between<br />
Y~Z on the remote controller<br />
approximately<br />
10kΩ?<br />
NO<br />
Replacement remote<br />
controller<br />
● Cases of other than FDT<br />
Remote controller<br />
wire is removed<br />
Resistance is<br />
approximately 10kΩ<br />
between indoor<br />
Y~Z.<br />
YES<br />
Remote controller<br />
wire short circuit<br />
YES<br />
NO<br />
NO<br />
Disconnection ?<br />
Noise?<br />
NO<br />
Is the<br />
voltage at the transfomer's<br />
secondary side (red-red) 15V<br />
or higher?<br />
YES<br />
Replacement indoor unit<br />
power supply PCB<br />
Is it normalized?<br />
NO<br />
Defective indoor unit control PCB<br />
Replace. (Defective CPU)<br />
YES<br />
Replacement<br />
remote controller<br />
Replacement indoor<br />
unit control PCB<br />
YES<br />
NO<br />
Harness<br />
exchange<br />
Transformer<br />
exchange<br />
Unit is normal.<br />
(Runaway of indoor<br />
unit CPU due to<br />
noise, etc.<br />
Transient trouble)
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