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Mitsubishi P240 User Manual

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[ 
IX  Troubleshooting ] 
- 227 -
HWE09120
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
W
hen all wires used for 
grouping
 are disconnected, is at 
least one
 of the L
ED2 on the
 
grouped 
indoor units lit?
YES
Replace the MA
 remote controller
.
Is there an indoor unit on 
which LED2 is turned of
f?
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?
(T
urns on momentarily 
approximately every 
20 seconds)
In the case of remote controller
,
to “1.phenomena”
*After correcting the error
, daisy-chain 
 the wire for the MA
 remote controller again.
In the case of
MA
 remote controller
to “1.phenomena”
In the case of
MA
 remote controller
to “1.phenomena”
and “2.phenomena”
In the case of
MA
 remote controller
to “3.phenomena”
In the case of
MA
 remote controller
to “2.phenomena”
No.1 Refrigerant circuit check
In the case of
MA
 remote controller
to “2.phenomena”
Check the malfunctioning 
refrigerant circuit.
Check for the M-NET
 
transmission line.
Replace the indoor unit control board.
Connect 2 remote controllers or less.
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 W
AIT" 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 W
AIT" 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 (SW
A) 
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
T
urns of
f 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 SW
A
 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