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Agile, I of course realise fault finding on boilers requires technical skill, i thought thats why this forum was here, so that technically minded people/ engineers could help the layman to trace and maybe in some cases repair their own faults. the majority of us are not idiots and with some...

Thanks for your comments, i understand what you are saying but something must still be wrong. It cannot be right that a modern boiler is only capable of providing a tepid shower? It seems to me that the boiler is shutting down before the whole dhw tank is up to temp. A question, if the hw tank...

where is and what does a blending valve look like? Does a heatslave 20-25 have one?

Fitted a new temp stat today, fired up the dhw and...... back to square one. boiler only fired for about 5 minutes then shut off. water from tap only runs hot for about 5 seconds then goes tepid. Dhw tank should hold 46 litres according to book. The only way to get the bioler to fire again is to...

Be Very very careful before putting water into an electrically heated towel rail. Sunds like a recipe for absolute disaster if its not supposed to have any!!

Thanx for all the comments, after a bit more "prodding about" i am thinking the same way as Holty, ie temp stat. Have been told theyre only £25, quite cheap in boiler part terms, so will order one and hope that cures it. Agile," A thermal survey under steady state conditions" has gone a bit over...

Thanks for your suggestions, will look into the flow switch h/e issue (and yes the temp stat is on max). :?

All those technical minds out there and no answers !!! Come on chaps.

hi Agile, heatslave manual says, and i quote, "tank temp is controlled by the domestic hot water control thermostat and is variable between 55-80 degrees c. Either way shower water is only hot for 15 seconds and is then just tepid no matter how long the water has been on. Any more thoughts?

Having just fixed a boiler fault (with agiles help) I now have a second problem. The domestic hot water is getting nowhere near hot enough, have put the thermostat on full, waited for the boiler to stop firing and measured the water temp at tap. Am getting 110 degrees F, i think thats about 50...

Thanks again. The other problem my wife has been complaining about (apart from the obvious) has been a lack of domestic hot water for a shower first thing in the morning. timer set to heat water 3/4 hour before use, but just a limited amount of warm appearing. At other times of day dhw seems to...

Some say he has fernox coursing through his veins, others say his plumbing has gone a bit saggy, we just know him as agile. Thank you agile, have just performed arterial surgery on the pipe from boiler to pressure vessel and removed a very large clot from aforementioned tube. I had already...

Agile, have followed your instructions. the pv reading is still .9bar. Does this mean a blockage in feed to pvessel.? or is the reading supposed to stay the same ?. Thanks for your help.

As ive said already pressure vessel has no water in it and it holds the .6 bar i put in. Could this have anything to do with the heat exchanger, and if so how would i check it?

Have checked pipe and its clear, any other thoughts?

I have a heatslave 20-25 thats driving me nuts, HELP PLEASE. Origional problem was a slow loss of pressure overnight. Re-pressurised every morning for 7 days, then auto air pressure valve dumped water all over floor, replaced valve. pressure still seeps away overnight (have tried reseating prv)...