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Sounds good. Will try to pick up a new EV tomorrow. Cheers! :wink:

OK, so the thermistor, is that the temp senso on the heat exchanger pipe? Heat exchanger scaling, possibly but we live in a very soft wter area and Ive yet to see any build up of limescale etc in any of our kettles or washing machine elements when they have needed replacing. Diverter valve...

Such as?

Whilst trying to diagnose my hot water problem, wife screaming cos the shower keeps going cold! Found I had water in the expansion vessel which I realise is a bad thing! lol. Would water in the vessel cause the DHW to cycle on and off? What pressure should the new one be charged to and...

OK, had another look today, the difference in temp between flow and return if Im measuring right is very much, wrote it down somewhere... After looking around a bit, I removed the cap from the pressure vessle and pressed the inner point to release a little air to make sure there was pressure...

Diverter valve is fine and working correctly. I am pretty competent with the old Ohm meter so can check. Have a temp sensor somewhere that plugs into the multimeter...will check temps of flow and return. What would be the maximum allowable difference on flow and return pipes? Will check...

Will check the flame and temp control. Are the other items sapart from a service something a handy/competant person like myself can do, ie strip down and clean? Am a sparky by trade and am mechanically minded. Is there anything i really shouldnt be opening up?

Could it be that the water is getting too hot so the boiler cuts out and then cuts back in when it senses it has cooled enough? If so, what would be the likely cause of this? OR Could it have anything to do with the expansion vessel? I know we had a pressure loss issue and someone said it...

Have a problem with the combi boiler, most noticeable when having a shower or when trying to run a bowl full of hot water. The boiler can be heard to kick in and we get hot water, then the boiler cuts out and water cools, kicks in hot...drops out, cold! Real PITA. Pressure in Central...