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SDH17-NW-U_EN - 05/14 - Saunier Duval
- 19 -
MAINTENANCE
EN
9 Troubleshooting
The table below describes a selection of problems with their
possible causes and solutions, see Table 9.1.
If these solutions do not solve the problem contact your usual
installer or call your nearest Saunier Duval ofce.
SYMPTOMS POSSIBLE CAUSES POSSIBLE SOLUTION
The system does not restart immediately When unit is stopped, it won't restart until 3
minutes have elapsed to protect the system
Wait 3 minutes before starting the unit again
When power is disconnected and reconnected
again, the protection circuit will work for three
minutes to protect the air to air heat pump unit
Wait 3 minutes after inserting the plug and
before starting the unit again
The system does not work at all (the ventilation
does not start)
The power lead is not connected correctly Connect the power lead correctly
Power supply cut Reconnect the power supply
The fuse has blown Replace the fuse. Only use the right fuses for
each model. Do not use wire or other material
to replace the fuse. Fires could be caused
Insufcient cooling or heating Doors and/or windows open Close the doors and/or windows
Heat source nearby (e.g. lots of people in the
room)
If possible, remove the heat source
The thermostat is set to an excessively high
temperature in cooling mode or excessively low
temperature in heating mode
Set the temperature properly
Obstacle in front of the air inlet or outlet Remove the obstacle to allow the air to
circulate properly
The ambient temperature has not reached the
designated level
Wait for a few moments
Dirty or blocked air lter Clean the air lter (the air lter should be
cleaned every 15 days)
Is there any direct sunlight through the window
during the cooling operation?
Use a curtain to protect the Air to Air heat pump
unit
Noise is heard During unit operation or when stopping the unit
a gurgling noise may be heard. This noise is
more audible the rst 2-3 minutes of operation
This is normal in an Air to Air heat pump unit.
The noise is caused by the refrigerant owing
in the system).
A cracking noise is heard during operation This is normal in an Air to Air heat pump unit.
The noise is caused by the casing expanding
or shrinking due to the temperature changes
If the noise is loud and comes from the louvers
during the unit operation, the air lters may be
too dirty
Clean the air lters properly
Smells are generated This is because the system circulates smells
from the indoor surrounding (furniture,
cigarettes)
This situation does not require any action
Mist or steam come are blown out from the unit During COOL mode or DRY mode operation,
the indoor unit may blow some mist. This is
due to the sudden cooling of the indoor air.
This situation does not require any action
Table 9.1 Troubleshooting.
43


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