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I've tested it a little furtehr following everyone's advice and found: If I turn the boiler up so it's heating to about 70c and reduce the temp gauage on the tank (down to say 50c, it clicked on the way) after about 2 hours I noticed that both the pipes going in to the side (top and bootom)...

All - to add to my last mail, I've now turned it off / on and it seems back to normal. The temperature is back down, the noises have stopped and the fault has disappeared. I'll still get an engineer to come and look though.

Hi, I noticed a whining and grumbling sound coming from the boiler this morning and it now has a SERV light on. It constanly keeps firing for a few seconds and then taking the temperature up to about 85c then stopping the burner for a few seconds then re-starting it all over again. I'll get the...

The return pipe on the boiler is hotter than most if not all the radiators. The cylinder has a stat and this is set to 60c I've added some new pictures showing this. I've measured one of the pipes going into a radiator and it is 19mm diameter. I wonder with the fact that the switch box...

All Thanks for the responses. Apologies, I've just looked on top of the boiler and seen the label. I assumed I would have to take the case off.. I've added 2 photos to show the sticker on top and also the boiler when on the max setting after about 15 mins (at 73c). Normally it only goes up...

Vitodens 100 Sticker

Vitodens 100 on max

Vitodens 100

Hi, Thanks for the response. Are they all 30kw or does it vary? Vitodens (who weren't particulaly helpful) suggested I check to see what the output was on the flue outlet. If it's only 26w would that be sufficient for 14 rads over a large area. I'll get the Weather Compensation checked...

Hi, I have moved into a large 4 bed 3 bathroom house recently and it had a Vitodens 100 boiler fitted new about 15 months ago (with no documents). An engineer has replaced the pump with a Grundvos and I have had it serviced and checked by 3 engineers. There are 14 radiators (6 down, 8 up) but...