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Is there anyway to test the pump speed without removal Thanks

The heat exchangers have been descaled. I was talking about the cap in the centre on the end of the pump spindle (motor side) not the bleed valve. Thank you

The Pump has been stripped and cleaned, heat exchangers cleaned also no sludge or build up etc. Forgot to mention that after the light flashes the boiler shuts down and has to be relighted. have not tested the pump off of the boiler. Whats thermisters? Thanks

Our combi boiler is cutting out after the overheating light flashes.(obviously overheating) If i turn down the comfort switch to below 4 the temperature light stays at 80 deg and the overheating light does not flash. Does the comfort switch adjust the flow of water or the amount of gas? Could...

Our 1 year old bosch dishwasher is making the plates/cups etc smell sort of like a pond. we have tried all sorts of settings, cleaners etc. have even used bleach. has anyone some advice or come across this themselves? Thanks

I enquired about another pump but they said its not made anymore and the new pumps have got bigger bsp fittings and that there is no reducer available. The pump is a WSP. I can get hold of hydrochloric (35%) and perhaps give the HE a flush. Thanks

The DHW exchanger is a cylinder shape, about 13cm od and about 13 deep. one pipe comes out and goes to the diverter valve. I am in grays, essex. Thanks

I have not taken out the DHW exchanger. I probably will, so what would be the best thing to flush it through with? Thanks ++++++++++++++++++++++++++++++++++++++++++++ Just had a listen to the boiler again while the hot water was running. It sounds like the flow is speeding up then slowing...

I don't think it is a plate type of heat exchanger. Seems to be a row of tubes going back and forth with fins around. The boiler is a radiant RSF 20-24 pilot flame. Thanks

I have had the heat exchanger out and flushed it through, it did not seem to have any flow problems. Thanks

All pipes are copper. The level of 17 - 18 was obtained from the local water authority, is it high? Yes, the flashing light is overheating. Thanks

Yes, the PH level is 17 - 18. Thanks

Thanks for everyones input. If I find the problem I will let you know.

So if I can stop the end of the spindle with my finger, the pump has had it? Thanks

Main heat exchanger Clear, had it out and flushed it. Had the pump head off, no blockage. How do I run the pump head when it's off? Any ideas how to test pump rpm, multimeter? Thanks

Checked and vented. Thanks

Water pressure is fine. the pump sounds like its running, although perhaps it may be running slow but I don't know how to check pump speed. I have had the heat exchanger out and it's totally clear. Cleaned the pump head. Changed the diverter valve cartridge because it was sticking. There is a...

My radiant combi boiler is flashing the over heating warning light when I use the hot water. Any ideas please. Thanks