boiler

[Nikkio]

We have a potterton boiler(Ultra 2). The problem is that even though the central heating is in the off position and the thermostat is set to the lowest setting, whenever hot water is required the heating comes on. Any ideas

[Nickienickie]

HI << our heating system does this as well but we are able to turn the heating off by setting the thermostat .. sounds like you need a heating bod in to check out the thermostat ... but then I'm no plumber ....

[Lindy Loo]

That's a weird one and never heard of it before!!! As Nickienickie says the best course of action would be get some expert help. It may even be a wiring problem where they've been crossed as every system I've come across the 2 function seperately Hope this helps and good luck

[New Forester]

I agree with Lindy Loo. Sounds as if the wiring has been done wrong, or something has come undone somewhere. I assume when you say the heating "comes on", you mean properly, with the pump going? Not just a couple of radiators getting warm? The latter could just be some convection, or it can happen if the pipe layout is not quite right. In this case the boiler pump "overshoots" and sends some water round the heating circuit -- the job only the heating pump is supposed to do. A heating engineer should be able to sort it out, either way. Nickienickie -- If your thermostat can turn off the heating, your heating itself must be working properly, with the pump going and everything. It's your controller which is not right -- either broken, or wired up wrong. You should be able to choose hot water without heating, or both. Some layouts can also do heating heating without hot water, if you should want that. New controllers are quite cheap.

[ianess]

Sounds to me like a diverter valve problem.......sorry....I`m just an amateur and I think you`re in need of a professional. Hope you know someone who can recommend one `cos there`s a helluva lot of cowboys out there.