29
8.3 Circulation pump
If the LED on the heating circuit pump flashes red even though
there is an active heat demand, disconnect the power supply for
30seconds. If the circulation pump does not run after switching
the power supply back on, replace the circulation pump.
8.4 Fault messages in the programming unit
Note
The message list can be found in a separate supplement.
If there is a fault in the system, a fault message appears on the
display. There is a fault memory so you can check earlier faults.
This is found under „MENU/ CONTRACTOR/ FAULT SEARCH“. The
programming unit shows the ten most recent faults.
Some fault messages prompt you to press the reset button.
1
26_04_01_0647
1 Electronics reset button
D0000039376
1
1 Reset button for high limit safety cut-out
9. Maintenance and cleaning
WARNING Electrocution
Prior to commencing any service or cleaning work,
isolate the appliance across all poles from the
power supply.
9.1 Cleaning the air/air heat exchanger
Check and clean the cross-countercurrent heat exchanger at least
once a year.
1.
2.
26_04_01_0642
1 Upper front panel
2 Cross-countercurrent heat exchanger
Open the door of the function module (r.h. half of the
appliance).
Remove the fascia fitted to the centre of the appliance.
Remove the upper front panel.
If the contamination level is modest, clean the cross-coun-
tercurrent heat exchanger with the brush attachment of a
vacuum cleaner.
If more severe contamination is visible and extends into the
cross-countercurrent heat exchanger, clean it as described in
the following.
Pull out the cross-countercurrent heat exchanger.
Clean the cross-countercurrent heat exchanger with warm
water. Do not use solvents.
Afterwards flush the cross-countercurrent heat exchanger
with warm water.
Let the cross-countercurrent heat exchanger dry out.
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