Our heating is on even when it's off...

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Our heating and hot water have timers. Hot water is on for two half hours a day. Heating timer is on 0600-0700 then again 2230-2300, but in practice I switch it on most days.

It is now 0130. There are no red lights on to indicate the heating is on. Yet it is. The heaters are hot. What is going on???

Have you got a hot water cylinder? Is the HW timer set to on? If you turn the HW timer off as well as the CH timer off, does the boiler stop firing and the radiators go cold?

What colour is your HW cylinder?

Take the readings from your gas meter and electricity meter and electricity meter. It would be better to do it for a week but start with a day and how much they go up in 24 hours. How old is your boiler, what make, and what do your room thermostat and your timer look like?

We had this one winter - the heating kept running on the very highest setting all night long. I can't quite remember exactly but I think it was a faulty pump or motor or something. You need a boiler engineer asap.

Thank you for the replies. House was built in 2 09.

Yes, we have a cylinder. It is white. The HW was also off last night when the radiators were hot.

We don't have gas, we have oil, which we can't memeasure very accurately. we have an external Worcester Bosch boiler in the garden. Will take elelectricity meter readings today.

When we switched the electricity off to the boiler we heard the noise of the water in the radiators stop, but when we switched it back on the noise started again.

We had this. One of the valves near the boiler had br

I've had this - if I remember rightly it was a blown fuse somewhere between the timer and the boiler

Timer looks like this: www.isylan.com/view-lot.aspx?id=40211&itemsperpage=50&sort=EndDate&itemspage=5

Gah

Sorry, had broken by the boiler. Oil here too. Was £70 for a new one including labour.

www.isylan.com/view-lot.aspx?id=40211&itemsperpage=50&sort=EndDate&itemspage=5EE

www.isylan.com/view-lot.aspx?id=40211&itemsperpage=50&sort=EndDate&itemspage=5

Room thermostat looks like this: www.draytoncontrols.co.uk/Combi-Stat.aspx

Oh £70 sounds good. Fingers crossed it's that!

We've had 2 plumber call outs and repairs for this heating system already and it's less than 5 years old.

Our timer actually says LP522 on it. Also Drayton and Lifestyle.

I think it may well be the end switch in your 3-port valve, which will need a heating engineer. I am not familiar with oil boilers but this part is usually external to the boiler. The other thing I would consider with a boiler outside the house is that it might be a frost protection thermostat but this should only make the boiler and pipes warm, not hot, if it was correctly installed and not malfunctioning. The part I am thinking of is replaceable without needing to drain down as it is inside the electric motor box attached to the valve, and you seem to have fairly modern good quality parts by ACL Drayton which are easily obtainable and serviceable.

I do not know if an oil boiler will grumble if you turn the power switch off, but phone your mender and he will know.

p.s.
With a gas boiler, you could also turn the boiler thermostat right down. This will leave the pump running but save fuel. Again I do not know if this is OK to do with oil but your mender I am sure will know at once if it is OK to do until the fault is fixed.

Thank you so much.

(We don't have a worcester bosch system, but) ...... When this has happened to us it's because dh has been playing with the control unit and set the "eco" temperature to something much higher than it's usual setting of 14 degrees. (Tend to leave control unit / thermostat in coldest part of house.) For us "eco" is the background temperature which the house isn't allowed to fall below. Do you have something like this on your unit which you could double check?

In this case, the controls are quite straightforward ones, so I do not think there is weather compensation or other controls with a mind of their own.

Piglet my boiler was outside the house and the heating kept coming on in the conservatory which was on a separate stat and a separate pump if I remember correctly. The frost stat did kick in at night if it was exceptionally cold, but the constant running on full whack even when the stat was turned really low was a fault to do with the pump/valve/motor or something else other than the stat. Just can't remember which.

That's it, ours was the 3 point valve. I think we had to have the water drained down to get it changed but it seemed quite straight forward.

Plumber coming, possibly next week. We have been able to switch it off with some fiddling (not quite sure what we did). It seems the timer is unable to turn the system off rather than it switching itself on.

Thank you again for all your help. I will come back to update when we've got it sorted.