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OK guys , here's a catch up. I had the front off the boiler and decided as I wasn't going to have time to clean the venturi properly, I would have a bit of a scrape round (in situ) in the section where the plastic pipe connects. Glad I did because now, I'm getting a half reasonable shower. There...

I'm referring to the other micro switch under and to the right of the pump, which I'm guessing is the flow diaphragm.

I checked this morning while the shower was running and the pin on the flow mainfold remained out whether the water produced was hot or cold. i don't know what the pump is set at (how would I tell?) but it hasn't been changed since it was fitted and the boiler was behaving itself. At the...

...and I have bled the heat exchanger and there was no air present.

OK Guys, The pin on the flow manifold comes out when CH is switched on and goes in when off. It appears to stay in when HW is running. I cannot see a flame when main flame isn't running, but the pilot light flame appears to pulling slightly by the fan. The problem does occur both with the hot...

Ian, I haven't left the hot tap running long enough to see if there's a temperature fluctuation, but I often have to fire the CH up long enough for the boiler to kick in, then switch it off and if I turn the hot tap, or shower on, the boiler will normally start up. I also should have mentioned...

Thanks, Unfortunately the temperature gauge hasn't worked for some time but I will conduct the visual checks. As it's a quite quick and cheap fix, is worth changing the diaphragm anyway? Terry

Thanks guys, How long would you expect a diaphragm to last before requiring replacement? I lose track of time, but I have replaced both diaphragm and diverter valve within the last two or three years. The fan does run at slow speed with no demand, the spindle does move out on demand. When the...

At the moment the shower varies from hot to cold for a few minutes then the boiler kicks back in. I can manage a quick shower (I have no hair) before it goes cold. Also, some days just turning the shower on (there's good flow) isn't enough for the boiler to kick in and I have to click the...