The knob broke on me, ecotec 824. It is easy to fix, even if you are not handy or elderly or a lady who does not do DIY, most ecotec models conform to below instructions: I was wondering if now the boiler has been 'cool' for a long period, if the knobs were a bit snug and that contraction in some way has strained them? I know this is an old thread (well, nearly 4 months, but seems to be the exact same problem I have just found, so didn't duplicate). Product Information: The control knob resides on one of the spindles located on the front of the appliance and allows you to manually control certain aspects of the boilers functionality. Some boilers enable you to change temperature and some even allow you to change the current function. This means the user can have the boiler provide central heating without the hot water being on and vice versa. I had a new Vaillant ecoTEC plus 937 installed in the autumn. All been well, boiler runs fine etc. Heating/water running ok (still).

However as I rotated it to fit into it's slot shape (has a slit on a side, need to align correctly) IT FITTED IN

auroMATIC 570

Pressing the metal body in helps ease it off by hand, if not strong use screwdriver or butter knife (if you have no screwdriver)

Wrap lots of tape at the few milimetres on top of broken stem: TO FORM A KNOB to control temperature Not what you're looking for? Try our unique Spares Finder tool or you can view all Vaillant Boiler Spares products. The plastic box slides out & down, stops at an angle, do not press it all the way down, leave it be I bought one that did not have inner central rings like my broken one, I bought it yesterday morning The VAILLANT 0020048969 KNOBS GREY (PK3) is a genuine, brand new Vaillant Boiler Spares product, covered by a Vaillant Boiler Spares manufacturer's guarantee.

calorMATIC 250/250f

So are any of you capable of posting a picture of what the knob looks like when it is not broken ? I assume that my knobs are broken but I do not really see where it broke off from... Very strange. You can also use a long piece of small square wood, shaved to fit at end, if your stem is too short (unlikely, they all break at the same place as mine)

Unclip the 4 Plastic clips on the white box: 2 on top, 2 on the sides, use your flat screwdriver again gently What needs to be done : first take the front cover off, there is only ONE screw that you need to loosen for this : it is underneath the CV heater, right at the front. Once that is loose you can take the whole front metal sheet off.I switched off the heating at the programme panel (in the kitchen) as not needed heating on recently (last 2-3 months). Just spent 3 cold days waiting for the replacements to arrive (boiler CH dial broke in off mode) and followed carefully your guidelines. Out of warranty and there was no way I was going to spend out on a clear case of it being a manufacturing fault, on what seems to be ATM a great boiler. Had I not been able to mend it, I would have insisted that Vaillant fix it (4 year old boiler) .... I mean after spending out thousands to fit an all singing and dancing bit of hi tec kit only for the control knob to fall off!