Mitsubishi Electric M Series Manual page 162

WALL-MOUNTED Inverter Heat Pump
MUZ-FD25VA MUZ-GE25VA
MUZ-FD25VABH MUZ-GE25VAH
MUZ-FD35VA MUZ-GE35VA
MUZ-FD35VABH MUZ-GE35VAH
MUZ-FD50VA
MUZ-FD50VAH
Failure mode recall function
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table disappears, the memorized failure details can be recalled.
Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button (MSZ-
FD, MSZ-GE25/35/42/50)/TEMP
ler at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set tempera-
ture is displayed) with the remote controller headed towards the indoor unit.
Does POWER (MSZ-FD)/the upper (MSZ-GE, MSZ-HC)
lamp of OPERATION INDICATOR lamp on the indoor unit
blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep is emitted at the same timing as the blinking of
POWER (MSZ-FD)/the upper (MSZ-GE, MSZ-HC)
lamp of OPERATION INDICATOR lamp.
Judgment of indoor/outdoor abnormality
Before blinking, does POWER (MSZ-FD)/the upper (MSZ-GE,
MSZ-HC) lamp of OPERATION INDICATOR lamp stay ON for
3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table.
Make sure to check at least 2 consecutive blinking cycles.
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.5-
second interval
2.5-second OFF
ON
OFF
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
2.5-second OFF 3-second ON
ON
OFF
Repeated cycle
C-160
MUZ-GE42VA
MUZ-GE42VAH
MUZ-GE50VA
MUZ-GE50VAH
button (MSZ-GE60/71) on the remote control-
1. Regardless of normal or abnormal condition,
a short beep is emitted once the signal is
received.
2
Yes (Blinks)
No
2
Blinking at 0.5-
second interval
2.5-second OFF
Repeated cycle
Blinking at 0.5-
second interval
No beep Beeps
MUZ-GE60VA
MUZ-GE71VA
MSZ-FD
1
Indoor unit is normal.
But the outdoor unit might be
abnormal because there are some
No (OFF)
abnormalities that can not be
recalled with this way.
Confirm if outdoor unit is abnormal
according to the detailed outdoor
unit failure mode recall function.
Yes
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table.
Make sure to check at least 2 consecutive blinking cycles.
Beeps Beeps
Repeated cycle
2.5-second OFF 3-second ON
No beep
Repeated cycle
MUZ-HC25VA
MUZ-HC35VA
MUZ-HC35VAB
MSZ-GE60/71
MSZ-GE20/25/35/42/50 MSZ-HC
3
Blinking at 0.5-
second interval
Beeps
Repeated cycle
M series