Hi all. Got an annoying problem with the Vokera Excell 80SP I inherited with the house I bought! Hoping someone might be able to help me out so it can continue to be a decent workhorse rather than ripped out needlessly.
Central heating system works just fine and gets suitatably hot.
But when turning on the hot water a few things happen:
- boiler never fires up unless hot water tap opened to full flow (very fast)
- even with full flow half the time boiler does not fire up at all. Water comes through ice cold. If that happens tap needs to be turned off and left for a short period of time (almost like boiler needs to reset itself).
- if the boiler does fire up then 9 times out of 10 the water temperature then cycles from cool (not ice cold) to slightly warmed through. If you do nothing it seems to do this endlessly (it doesn't slowly get hotter)
- hotter water can only be obtained by turning tap partially closed, then partially open again repeatedly until you get lucky. When it does finally come through hot it usually stays that way until you dare to touch the tap again!
Any ideas for systemmatically identifying the problem please?
Would love to have it suitably repaired rather than throw it out (especially given CH seems fine).
I've owners and installers manuals to identify any problemmatic parts anyone suggests I check.
Thanks in advance. Can't offer much at all in return other than best wishes and a promise I offer my expertise on other forums that aren't to do with boilers!
Matt
Central heating system works just fine and gets suitatably hot.
But when turning on the hot water a few things happen:
- boiler never fires up unless hot water tap opened to full flow (very fast)
- even with full flow half the time boiler does not fire up at all. Water comes through ice cold. If that happens tap needs to be turned off and left for a short period of time (almost like boiler needs to reset itself).
- if the boiler does fire up then 9 times out of 10 the water temperature then cycles from cool (not ice cold) to slightly warmed through. If you do nothing it seems to do this endlessly (it doesn't slowly get hotter)
- hotter water can only be obtained by turning tap partially closed, then partially open again repeatedly until you get lucky. When it does finally come through hot it usually stays that way until you dare to touch the tap again!
Any ideas for systemmatically identifying the problem please?
Would love to have it suitably repaired rather than throw it out (especially given CH seems fine).
I've owners and installers manuals to identify any problemmatic parts anyone suggests I check.
Thanks in advance. Can't offer much at all in return other than best wishes and a promise I offer my expertise on other forums that aren't to do with boilers!
Matt