Mitsubishi Electric VL-250CZPVU-L-ERT Handbook page 32

No. Symptom
4 Even though the
controller is oper-
ated to change the
ventilation mode,
the ventilation
switching damper is
not moved.
5 When the ventila-
tion mode is set
to automatic ven-
tilation mode, the
ventilation switching
damper does not
operate.
Cause
The outdoor air temperature
is 8 °C or lower.
Temperature condition for
the Heat exchange ventila-
tion or By-pass ventilation is
not satisfied.
The outdoor air temperature
is 8 °C or lower.
The operation mode of the
interlocked air conditioner
(Mr. Slim) is set to heating
or air-blowing operation.
When the outdoor air temperature is 8°C or lower, the
ventilation mode is fixed to the Heat exchange ventila-
tion mode.
Check the temperature map.
For details, see "6.4.4 Auto Bypass" of the Installation
Manual.
When the outdoor air temperature is 8°C or lower, the
ventilation mode is fixed to the Heat exchange ventila-
tion mode.
If the operation mode of the interlocked air conditioner
is heating or air-blowing operation, the ventilation
mode is fixed to the Heat exchange ventilation mode.
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Corrective action