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[ IX Troubleshooting ]
- 221 -
HWE08040 GB
Flow chart
Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running.
YES
Blinking?
Is " " displayed on
the remote controller?
NO
NO
NO
YES
YES
When all wires used for
grouping are disconnected, is at
least one of the LED2 on the
grouped indoor units lit?
YES
Replace the MA remote controller.
Is there an indoor unit on
which LED2 is turned off?
If operated afterwards,
error 6602 or
6607 occurs.
Check the voltage between
the MA remote controller
terminals (A and B).
9-13VDC if the voltage is applied
and 0V if no voltage is applied.
Is LED1 on the indoor unit
control board lit?
(Blinks for 2 or 3 seconds
approximately every
20 seconds)
Does the number of the MA
remote controllers that are
connected to an indoor
unit exceed the allowable
range (2 units)?
Blinking?
(Turns on momentarily
approximately every
20 seconds)
To 4.(1) 1
In the case of
MA remote controller
To 1.
In the case of
MA remote controller
To 1. - 2.
In the case of
MA remote controller
To 3.
In the case of
MA remote controller
To 2.
No.1 Refrigerant circuit check
In the case of
MA remote controller
To 2.
Check the malfunctioning
refrigerant circuit.
Check for the M-NET
transmission line.
Replace the indoor unit control board.
Connect 2 remote controllers or less.
*After correcting the error, daisy-chain
the wire for the MA remote controller again.
Check whether the screw
on the wire is not loose.
Is LED2 on the indoor unit
control board blinking?
When the unit is operated with
the remote controller, will "ON"
appear on the display?
Is "Centralized"
displayed?
"HO"/"PLEASE WAIT" keeps
blinking on the MA remote controller.
Is only the power source of the
indoor unit turn turned on again?
DEMAND by MELANS?
External thermo
input setting?
(SW3-3=ON)
Does an error occur when
the power is reset?
Does the unit work properly
when the wire for the MA
remote controller is
daisy-chained again?
Is LED1 on the indoor
unit control board lit?
Does the MA remote controller
work properly when it is connected
to the specified indoor unit?
Does an error occur when
the power is reset?
Running group operation with
the MA remote controller?
Is the unit grouped
with the equipment package
indoor unit?
No fault with the equipment
package indoor unit?
Does an error occur when
the power is reset?
Check that no error occurs in other indoor units.
Check the indoor unit on
which LED2 is lit.
All the indoor unit
power failure?
All the indoor unit
power failure?
Error display?
Error display?
Thermo is OFF?
Is operation possible?
Short circuit of the
remote controller?
After turning the power on, check whether "HO"/
"PLEASE WAIT" is displayed on the remote controller.
After more than 20 seconds since
turning the power on, is LED2 check
of the indoor control board still
displayed?
Is the operation by MELANS
forbidden or the input from external control
equipment allowed (SWC=ON)?
Is the compulsory
thermo OFF (SWA)
switch set to "2" or "3"?
Although No.1 refrigerant circuit
is normal, No.2 or No.3
refrigerant circuit remain stopped.
Running group operation with
the MA remote controller?
Does the indoor unit make
an instantaneous stop?
Power supply voltage
AC188~253V?
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
When no error occurs
NO
NO
NO
Keep displaying
for 5 or more minutes.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Check the
power supply.
Check the wire for
the remote controller.
NO
Replace the indoor unit control board.
NO
NO
NO
NO
NO
Replace the MA
remote controller.
NO
Replace the remote controller
or the indoor control board.
YES
Replace the indoor unit control
board where an error occurs.
Keep the operation.
NO
NO
NO
NO
Keep the operation.
YES
YES
YES
YES
Power on
YES
Refer to the self-diagnosis list
for the displayed error code.
YES
Normal
Turns off within approximately 5 minutes.
After the main power on, start the MA remote
controller. "HO" display will appear.
YES
Normal
"Centralized" is displayed.
YES
Refer to the error code list.
YES
YES
YES
Normal
YES
Normal
(Is the thermo OFF
signal input?)
YES
Set the SWA to "1".
YES
Refer to the self-diagnosis list for
the displayed error code.
YES
YES
YES
YES
Check the equipment
package indoor unit.
YES
Replace the remote controller or
the indoor control board.
Replace the indoor unit control board.
YES
YES
YES
Replace the remote controller
or the indoor control board.
Normal
(Operate the unit with
external control equipment)
YES
YES
Replace the indoor
unit control board.
Check the
power supply.
YES
YES
YES
YES
Check the voltage
between the MA remote controller
terminal blocks (TB15) (A and B).
9-13VDC if the voltage
is applied and 0V if no voltage
is applied.
NO
Disconnected wire for
the remote controller?
Disconnected wire to
the terminal block?
Disconnected relay connector?
NO
Are the length or the diameter
of the wire for MA remote controller
out of specification?
NO
YES
YES
Use the wire that meets the specification.
Replace the wire for the MA remote controller.
YES
Check for the wire for
the remote controller.
Keep the operation.
YES
Replace the indoor
unit control board.
YES
YES
YES
Power on