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Mend Potterton 80e Heating Pressure Switch

Water in Air Pressure switch in Potterton 80e?

Potterton 80e fan starts but will not fire. Service man discovered water in air pressure switch. Question is
1. How does water get into switch which has been operating satisfactorily for years and
2. can such water cause switch to malfunction ?

TED O'KEEFFE
October 2009

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