Failure Mode Recall Function - Mitsubishi Electric SUZ-KA25VA Service Manual

12-2. Failure mode recall function

As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be
recalled by following the procedures below.
Use this function when the check code is not displayed with wired remote controller or the remote controller at use is
wireless type.
12-2-1. Flow chart of the indoor/outdoor unit failure mode recall function
Operational procedure (For wireless remote controller)
Setting up the failure mode recall function
Turn ON the power supply.
While pressing both OPERATION SELECT button and TOO COOL
button on the remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons since all LCD in operation display
section of the remote controller is displayed after 3 seconds.
1
Press OPERATE/STOP (ON/OFF) button of the remote controller
(the set temperature is displayed).
Does OPERATION INDICATOR lamp on the indoor
unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep sounds are emitted at the same timing of the
blinking of OPERATION INDICATOR lamp. 2
Judgment of indoor/outdoor abnormality
Before blinking, does POWER
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.
Make sure to check at least two consecutive blinking cycles.
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
With the remote controller headed towards the indoor unit, press any button
that is not used in this failure mode recall function (e.g. TIMER button) .
OR
Turn OFF the power supply and turn ON it again.
Press RESET button of the remote controller.
Repair the defective parts.
Note1. 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:[Output pattern A]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blink
Off
pattern
Approx. 2.5 sec.
Self-check
starts
(Start signal
received)
3.Blinking pattern when the outdoor unit is abnormal:[Output pattern B]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blink
Off
pattern
Approx. 2.5 sec.
Self-check
starts
(Start signal
received)
Yes
(Blinks)
No
Beep Beep Beep Beep
st nd rd
1 2 3 n
On On On On
0.5 sec. 0.5 sec. 0.5 sec.
0.5 sec.
Number of blinks/beeps in pattern indicates the check
code in the next page (i.e., n=5 for "P5")
Beep Beep Beep
1 st 2
On On On
Approx. 3 sec. 0.5 sec. 0.5 sec.
Number of blinks/beeps in pattern indicates the check
code in the next page (i.e., n=5 for "U2")
ON/OFF
No
Indoor unit is normal.
(OFF)
There is a possibility that the plasma or outdoor unit is abnormal.
Confirm the failure detail on the LED display of the outdoor
controller board.(refer to 12-2-4.)
Yes
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal
point(12-2.3.).
2 Make sure to check at least two consecutive blinking cycles.
Beep Beep
th
st nd
1 2 Repeated
· · ·
Off On On
Approx. 2.5 sec. 0.5 sec. 0.5 sec.
Number of blinks/beeps in pattern indicates
the check code in the next page
Beep
nd 3 rd n th
On On Off
0.5 sec. 0.5 sec. Approx. 2.5 sec.
59
While pressing both OPERATION SELECT
button and TOO COOL button on the
remote controller at the same time,
press RESET button.
First, release RESET button.
And release the other two buttons since all LCD
in operation display section of the remote controller
is displayed after 3 seconds.
h
TOO TOO
WARM COOL
1. Regardless of normal or abnormal, a short
beep is emitted once as the signal is received.
OPERATION INDICATOR lamp
Beep Beep
st nd
1 2
· · ·
On On On
Approx. 3 sec. 0.5 sec. 0.5 sec.
Number of blinks/beeps in pattern indicates
the check code in the next page
3
Repeated