Mend > Home Heating Systems

vokera excell 80 sp PROBLEM?

heating fine , but wene i run hotwater it goes to full burner and shortly it goes to low burner thus colder water , engineer has swapped thermister/ modulator/ diaphram, and now thinks its the pcb!! , can you help , hes mentioned gas presssure fine on heating but fluxuates on water side . regards andy

andy galbraith
December 2007

Vokera Heating, Home Heating Systems Problem Heating Hotwater

yes its going to low flame , im planning to clean up exchanger and venturi pipes tomorrow , any tips ?

andy galbraith
January 2008

It doesn't take long to remove the domestic heat exchanger, this may be blocked.

Big A
December 2007

Are you sure it is modulating down to low burner and not cutting off and going to pilot?. Does the flame go down with a click from the gas valve?.

c
December 2007

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