Mitsubishi Heavy Industries FDCVA1002HESAR, Technical Manual, Page: 255 / 329

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Error display :
E1 [Communication error between the remote controller and the Indoor unit]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Stays OFF
Keeps flashing
Red LED
Green LED
Outdoor unit
Voltage
between X and Z
approximately
10-11 V?
YES
NO
Replace the
remote controller.
Voltage
fluctuates between
5-11 V between
Y and Z.
Is the
resistance between
Y~Z on the remote controller
approximately
10k
Ω
?
NO
YES
YES
YES
YES
Voltage
fluctuates between
5-10 V between
Y and Z
indoors.
NO
Remote controller
wire disconnection
Voltage
fluctuates between
5-10 V between
CnB Y and Z.
After the green LED lights up once,
it begins flashing again continuously.
The louver moves once in the
close direction.
NO
Harness between the terminal
block and CnB is defect.
Indoor unit
resets every
4 minutes.
Resistance is
approximately 10k
between indoor
Y~Z.
NO
YES
Noise
Replace the indoor
unit control PCB.
Reset the power supply.
Normal?
Normal?
NO
NO
Replace the
remote controller.
NO
YES
Replace the indoor
unit control PCB.
Remote controller
wire short circuit
YES
NO
Replace the
remote controller.
Noise? Reset the power supply
Turn OFF the
power supply.
Remove the remote controller
wiring temporarily.
YES
Indoor unit
Red LED
Green LED
Stays OFF
Stays OFF or Lights
continuously
Stays OFF
Keeps flashing
Red LED
Green LED
Outdoor unit
YES
NO
YES
YES
NO
NO
NO
YES
Reset the power
supply.
Check the CnW5-
CnW8 harness.
Replace the indoor
unit control PCB.
Is it normalized?
Disconnection ?
Replace the indoor unit
power supply PCB.
Replace the
harness.
Replace the
transformer.
Is the
voltage at the transfomer's
secondary side (red-red) 15V
or higher?
(malfunction due to
temporary noise)
Unit is normal.
YES
NO
Replace the indoor unit
control PCB.
Is the voltage
between CnW8
- 12V?
Normal
The unit is normal.
(The malfunction is due to noise, etc.)
Reset the power supply.
In case Green LED on
the indoor unit is lit
In case Green LED on
the indoor unit is OFF (1)
Only in case of FDT
In case except FDT