Mitsubishi Electric AE-200A Service Handbook page 68

[V Troubleshooting]
Symptom
A buzzer sounds
(continuous beeping sound)
and the screen is not
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displayed after turning on
the power of the unit.
The set temperature is not
reflected when the operation
mode and set temperature
are changed at the same
time. Or the set temperature
is not reflected when the
operation mode and set
temperature are changed at
the same time in the
schedule settings.
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The temperature does not
return to the original set
temperature when control
ends for setback control.
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Cause
The AE-200/AE-50 has failed.
(Internal power supply failure, etc.)
1) One of the following local
remote controllers is connected
to the air-conditioning unit.
・ ME remote controller (model
before PAR-U02MEDA and
PAR-U01MEDU)
・ MA remote controller (model
before PAR-31MAA(E))
・ MA remote controller (model
before PAR-21MAA)
2) The air-conditioning unit is set
to one of the following.
・ The set temperature is 18°C
(64°F) or less in the "Heat"
operation mode.
・ The set temperature is 29°C
(84°F) or more in the "Cool"
or "Dry" operation mode.
3) The operation mode and set
temperature change at the
same time.
* The operation mode changes
from "Heat" to "Cool" or "Dry,"
or from "Cool" or "Dry" to
"Heat."
* The set temperature is set to
an arbitrary temperature.
1) One of the following local
remote controllers is connected
to the air-conditioning unit.
・ ME remote controller (model
before PAR-U02MEDA and
PAR-U01MEDU)
・ MA remote controller (model
before PAR-31MAA(E))
・ MA remote controller (model
before PAR-21MAA)
2) The setting is one of the
following before setback control
is executed.
・ The lower limit temperature is
18°C (64°F) or less in the
"Cool," "Dry," or "Auto"
operation mode.
・ The upper limit temperature
is 29°C (84°F) or more in the
"Heat" or "Auto" operation
mode.
3) Setback control starts in one of
the following states.
・ Heating control that exceeds
the lower limit temperature is
started in the "Cool," "Dry," or
"Auto" operation mode.
・ Cooling control that exceeds
the upper limit temperature is
started in the "Auto" or
"Heating" operation mode.
Check procedure and remedy
The AE-200/AE-50 has failed.
Replace the AE-200/AE-50.
This symptom is likely when causes 1) to 3) are all met and
multiple air-conditioning units are operated at the same time
from the centralized controller or system remote controller.
Perform the check using the method described below.
Cause 1) Confirm the model name printed on the local remote
controller or from the supplied instruction manual.
Cause 2) Display the operation screen and check the settings.
Cause 3) Check the settings before the change and settings
after the change in the operation screen.
If this symptom occurred, the problem can be prevented by
taking the following measure.
If the operation mode is "Heat" for cause 2), change the
setting for the set temperature to 19°C (66°F) or more, and if it
is "Cool," change the setting for the set temperature to 28°C
(82°F) or less.
If schedule settings are used and the symptom occurred, the
problem can be prevented by taking the following measure.
If the operation mode is "Heat," set the schedule setting for
the set temperature to 19°C (66°F) or more, and if it is "Cool,"
set the schedule setting for the set temperature to 28°C (82°F)
or less before the time you wish to set in the schedule (five
minutes before is recommended).
Example: When wish to set to heating 26°C (79°F) at 8:00.
7:55 Cooling 28°C (82°F) (schedule setting)
↓
8:00 Heating 26°C (79°F) (schedule setting)
This symptom is likely when causes 1) to 3) are all met and
setback controlled is used, Perform the check using the
method described below.
Cause 1) Confirm the model name printed on the local remote
controller or the model number from the supplied
instruction manual.
Cause 2) Display the operation screen and check the settings.
Furthermore, check the upper limit temperature and
lower limit temperature from the initial settings
screen.
If this symptom occurred, the problem can be prevented by
taking the following measure.
In the winter season, set the operation mode to "Heat" before
setback control is executed.
In the summer season, set the operation mode to "Cool" or
"Dry" before setback control is executed.
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