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Mend Protherm 80e Problem Combi Set

protherm 80e F1 problem will run?

Protherm 80e combi boiler will run then turns off showin F1. will then re set only to repeat cycle. How can I find what the problem is, have no manual. Both water and heating workin well when boiler runs.

Anne
November 2009
either pump not running correctly or thermistors faulty.

peter
December 2009

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