Remedial Maintenance; Cleaning The Drain Pump And Non-Return Valve - Miele PG 8504 Operating Instructions Manual

Commercial dishwasher for laboratory glassware and utensils
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Remedial maintenance

110

Cleaning the drain pump and non-return valve

If water has not pumped away at the end of a programme there may
be a foreign object in the drain pump or blocking the non-return
valve.
Take the filter combination out of the wash cabinet (see
Maintenance / Cleaning the filters in the wash cabinet").
Lift the locking clamp.
Lift out the non-return valve and rinse well under running water.
Make sure that the vent on the external part of the non-return valve
is not blocked. (This vent is only visible when the non-return valve
has been taken out). If it is blocked, use a pointed object to release
the blockage.
The drain pump impeller is situated under the non-return valve (see
arrow).
Check the impeller for blockages and remove them if necessary.
Carefully replace the non-return valve and secure it with the clamp.

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