Ravenheat LS100T - hot water only when heating is on

Joined
15 Oct 2009
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London
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United Kingdom
Hello folks, new here and a complete newbie to plumbing.

LS100T is approx 4 years old - first 'service' 4 months ago together with 'fix' of intermittent hot water at all outlets (boiler not firing when hot tap opened) - was told by Plumber 1 that a filter on the diverter valve was changed (??).

Related problems:

# With timer in off position, can hear click at boiler when hot water tap opened, but boiler doesn't fire and no hot water at any outlet
# With CH on, hot water available, but can go cold within 2-3 minutes
# With CH on, hot water takes a good minute of tap running before hot water available.

'Filter change' works for 2 weeks , then same problem again - called same plumber 1 back out, reckons its the diverter valve itself, but fails to come around at agreed time - i cut my losses and try another plumber.

Plumber 2 looks at problem, reckons its the timer itself, possible electrical fault? Says replace part TM6192?

Questions - does this sound feasible? Secondly, is it something a complete novice can do or do i need to call someone out?

Thoughts please folks

SP
 

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