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Few days ago I changed the Flow Microswitch as it was very badly corroded from the leak (weep) from the DHW Dipahragm Valve immediately above it. Decided to test, before changing anything else. Hot water seems to flow better, but still getting times when hot water doesn't come on. Went...

I'm just doing the DHW Valve for now. Some parts in kit are for Flow Valve & Diverter Valve I believe, I'll do those another time. Just want to know how many parts are for DHW Valve ??

I'm looking to now change the DHW Diaphragm. There is also a small weep around the pin which pushes the microswitch. Reading other threads, I think I will have to change the seal around the pin which comes in the Vokera Excell T0019 Service Kit, which I think is one of the brass sealing...

Went to try this, using DHW isolation valve under boiler to watch pin & fulcrum arm move, and the damn thing (the isolation valve) starts dripping from head. The DHW inlet isolation valve under boiler has started dripping !! As I turn on/off it drips more, then settles down, seems to have...

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Thanks, I'll let you know how I get on.

That's interesting, didn't realise that's how the domestic hot water is heated. My fault is still present, hot water not coming on or coming on intermittently. I thought I'd freed up mechanism so it was working better, but it's gone back to way it was, not working very well. I need to...

Out of interest how does this boiler switch between heating the Domestic Hot Water & Central Heating water ?? They are separate systems. Are there separate heat exchangers ?? Looking at the Vokera manual (see page 33) the Domestic Hot Water Heat Exchanger seems to be at back of boiler...

Brilliant idea, or have someone else to help. As I turned hot water on/off, only saw it after it had already moved to max/min position, I couldn't see it actually moving.

When I wasn't getting hot water, nothing was happening, just cold water flowing, couldn't hear fan change speed, not sure about pump, assume that's ok. The microswitch wasn't closed, if I gently pulled final bit, hot water flowed ok. The microswitch was on borderline & just needed to move...

Did what you say. Initially made no difference, then magically seemed to start working & also working much better. Possibly dicky microswitch, and/or diaphragm as you say. =========================================== 1) Turned on hot tap, no hot water as usual. Saw arm, pin...

When I turn on hot water, the hot water does not run 9 times out of 10. I have to try many times to get hot water to flow, or switch on heating which seems to help get the hot water flowing. But it's unpredictable & very intermittent. Sometimes it will run. Sometimes it will run...

What would happen if it is choked ?? The fan seems to be running ok, good airflow through flue.

I did this, removed inlet/exhaust pipe, cleaned one venturi & it seems to have solved problem, but why ?? Took pipe off boiler, couldn't see anything inside the venturi pointing upwards. There were a few bits of dust/dirt build-up on inside of this venturi, but nothing major. Ran a thin...

Any suggestions on adhesive to use ??

I was hammering a cable clip into concrete wall, on an edge above a door. A sliver (1"x3") small piece has chipped off. What can I use to glue & hold this small piece back in place ??