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7. Troubleshooting
Take the following actions if trouble shown in the table below occurs. If trouble is not corrected even after
taking the required action, or if trouble other than that indicated in the following table occurs, turn OFF the
circuit breaker on the power board, and then contact your dealer or an electrical contractor.
Symptom
No operation
Operating noise has
increased
Air flow has reduced
Burbling noise from product
Noise fluctuates
Dew condensation water in
the filter case
The volume of the operating
noise is different in different
rooms
Sometimes air stops being
blown out of the Lossnay unit
Supply air flow is cold
Automatic supply air stop function/Automatic supply air intermittent operation function
To prevent dew condensation forming on the Lossnay core and water droplets from adhering to the
product when there is a drop in the temperature of the outside air, operation of the supply air fan is
controlled to approximately the following temperatures.
Supply air stop mode
(continuous supply air stopped)
Outdoor air temperature -5°C
or lower
Note:
- The exhaust fan runs continuously regardless of outdoor air temperature.
- Even while the supply air fan has stopped, the Lossnay unit sometimes operates periodically to measure the outdoor air
temperature.
Cause
Power is not supplied to the Lossnay unit.
The ON/OFF button on the remote controller is not
"ON".
The filter is not installed securely.
The filter is clogged.
The outdoor hood is blocked.
The filter is clogged.
Dew condensation water in the drain pipes is sucked
into the wind taken in by the ventilation unit but is not
being discharged.
Noise sometimes gets louder because of the
influence of outside wind. This is not a malfunction.
Dew condensation water sometimes builds up in
some operating environments.
The volume of the noise sometimes differs, for
example, because of the length of the piping to each
room.
The unit is operating in the supply air intermittent
mode.
The outdoor air temperature is low.
Supply air intermittent operation
(24-minute operation followed by
a 6-minute stop)
-5°C or more from outdoor air
temperature of 0°C
Check the circuit breaker on the power board.
Press the ON/OFF button on the remote controller to
turn on.
Re-install the filter. (see page 14.)
Clean the filter. (see pages 13 and 14.)
Remove obstacles.
Clean the filter. (see pages 13 and 14.)
Change the ventilation unit mode to low operation. This
makes it easier for dew condensation water in the drain
pipes to be discharged and will eliminate the knocking
noise.
If you are worried about sound fluctuation, contact your
dealer or an electrical contractor.
It is not a malfunction.
It is not a malfunction.
It is not a malfunction.
See "Automatic supply air stop function/Automatic
supply air intermittent operation function." (see below)
It is not a malfunction.
Supply air sometimes is cooled be the outside air.
Continuous operation
Outdoor air temperature 0°C or
higher
Action
Eng-15
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