OPERATION
Troubleshooting
www.stiebel-eltron.com LWZ304-404 SOL | 17
2.
3.
4.
1.
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1
2
1 Extract air filter
2 Supply air filter
Undo the r.h. knurled nut by turning it anti-clockwise.
Undo the l.h. knurled nut by turning it anti-clockwise to ena-
ble the filter cover to be pivoted downwards.
Pull out the filter cassette.
Note
Ensure that you do not interchange the extract air and
supply air filters when reinserting them into the appli-
ance. The filter cassette of the extract air filter (upper
filter) features two grip holes at the front.
Replace the filter.
Push the new filter cassette into the appliance.
Rotate the filter cover back into its original position and then
tighten the r.h. knurled nut clockwise.
Tighten the l.h. knurled nut.
At the programming unit, activate the “RESET FILTER” pa-
rameter (“SETTINGS/ VENTILATION/ SERVICE”).
!
WARNING Injury
All other work on the appliance must only be carried out
by qualified contractors.
Note
Have the cross-countercurrent heat exchanger, outdoor
air filter, evaporator and fans checked and (if required)
cleaned once a year by a qualified contractor.
Cleaning the extract and supply air valve filters
If installed, clean the extract air valve filters through which
air is extracted from the rooms.
If installed, clean the supply air valve filters through which
air is supplied to the rooms.
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 qualified 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
displayed, and if necessary, notify your qualified 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 qualified contractor or call customer service.
6.5 The appliance leaks water
If water escapes from the appliance, shut it down immediately and
notify your qualified 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 appear on the surface of the appli-
ance and on the thermally insulated air hoses. This should stop
when the house has dried out thoroughly which, subject to the
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