STIEBEL ELTRON LWZ 404 SOL Operation

OPERATION
Troubleshooting
24 | LWZ 304-404 SOL www.stiebel-eltron.com
Cleaning the extract and supply air valve filters
f If installed, clean the extract air valve filters through which
air is extracted from the rooms.
f If installed, clean the supply air valve filters through which
air is supplied to the rooms.
f Clean the filter box (if present) attached to the outdoor air
connector on the rear of the appliance.
6. Troubleshooting
6.1 Filter symbols appear
The appliance is equipped with an automatic filter contamination
detector. The constant flow rate control of the fans results in an
increase in fan speed when the filters become contaminated. This
increase in speed is evaluated to display a filter change require-
ment.
When the filters are contaminated, the following symbols are
displayed.
Filter change, top:
The extract air filter is contaminated. Please change the
extract air filter.
Filter change, bottom:
The supply air filter is contaminated. Please change the
supply air filter.
Filter change, top and bottom:
Extract air and supply air filters are contaminated or their
filter change intervals have expired. Please change the
extract air and supply air filters.
The filter symbol appears automatically after three months.
6.2 No hot water
Should you fail to obtain hot water, you can take the following
steps to remedy the situation yourself:
- If the appliance has no power: Check the fuse/circuit breaker
in your fuse box. If it has blown/tripped, replace/reset the
fuse/MCB. Notify your contractor if the fuse/MCB blows/trips
again.
- If the appliance has power: Check whether the air intake/
discharge is blocked. Check whether a fault code is being dis-
played, and if necessary, notify your local contractor. Check
whether the control unit is set correctly.
6.3 The safety valve of the cold water supply line
is dripping
This may occur during the heat-up phase and is completely nor-
mal.
6.4 The fault symbol appears

Note
If this symbol appears, it means a fault has occurred.
Notify your local contractor or call customer service.
6.5 The appliance leaks water
If water escapes from the appliance, shut it down immediately and
notify your local contractor.
6.6 Condensate on the outside of the appliance or
on the air hoses
In the drying out phase or when relative humidity is high (>60%),
it is normal for condensate to leak from the top of the appliance
and from the thermally insulated air hoses. This should stop when
the house has dried out thoroughly which, subject to the design,
can take up to 2 years. If the room is used to dry washing however,
condensate can still form.
f Check whether the air hoses are fitted correctly, and that no
cold air escapes.
6.7 Noise is emitted
Since the appliance moves very large volumes of air, it cannot
work silently.
However, there should not be any disturbing noises in the living
rooms and bedrooms. To achieve this, ensure that
- the appliance has been installed correctly.
- the installation room has a door that closes tightly.
- adequately sized silencers are integrated directly on the ap-
pliance in the supply air and extract air ducts.
- additional silencers are installed between bedrooms, nurser-
ies and living rooms.
- the air volumes have been adjusted and checked according to
the system design.
If you notice dragging noises when the fan or heat pump are in
operation, take the appliance out of use immediately and notify
your contractor.
If dragging noises occur during heat pump operation, the exhaust
air fan may be the cause. During shipping, the fan may slightly
move in relation to the air nozzle. This may result in dragging
noises. If necessary, the exhaust air fan should be aligned as part
of the commissioning work.
6.8 The required flow temperatures are not
reached, particularly during drying out
When drying screed, output levels will be required that are far
above those necessary for standard heating operation. It can
therefore take a relatively long time before, for example, the low
end temperature is reached. However, the correct temperature
curve for drying out is ensured because the next stage in every
case is not started until the default temperature for the current
step has been reached. In case of all other faults, please always
notify your contractor.
6.9 The accommodation is always too cold
Increase the low end temperature of the heating curve. Raise the
temperature by the number of degrees you require to obtain a
comfortable temperature.
296066-38500-9030_LWZ_304-404_SOL_Bedienung_en.indb 24 21.07.2015 12:03:57

STIEBEL ELTRON LWZ 404 SOL Specifications

General

Brand	STIEBEL ELTRON
Model	LWZ 404 SOL
Category	Fan
Language	English