Bathroom rad getting hot, heating not on

[Custom45]

Hi
Have a Worcester Bosch external oil combi, fitted last October. For some reason the bathroom tower radiator keeps getting warm, even when the heating is turned off.

It was suggested it might be a faulty diverter valve, so has WB come out and replace it, but problem is still occurring.

Bathroom rad is not linked in to hot water system as far as I'm aware.

Any thoughts?

Cheers

 

[Custom45]

...

 

[oldbuffer]

1. Nothing simple like an electric element fitted and not turned off?
2. Does it get just warm or properly hot? If lukewarm, could be picking up heat from a hot pipe underneath the flow and / or return to radiator.
3. Does its warming coincide with a specific event, such as running the shower or a basin?
4. Photo. of the radiator and its valves might be useful.

 

[Custom45]

No, it's part of the main oil fired central heating system. Gets fairly warm, yes, but I'd say not as warm as when the heating is on.

Don't think it coincides with anything, no.

Photos of the rad below. Pipes drop-down and go off to side, under floorboard where they join with rest of the system. This is the highest rad in the house (it's upstairs and is mounted higher on wall than all other rads).

 

[CBW]

Wait until system cold (eg rad and no hot water ran), open a hot tap and feel the flow pipe, see if it warms up.

 

[Custom45]

Wait until system cold (eg rad and no hot water ran), open a hot tap and feel the flow pipe, see if it warms up.

Tried that, rad stayed cold.

 

[fixitflav]

Hi
Have a Worcester Bosch external oil combi, fitted last October. For some reason the bathroom tower radiator keeps getting warm, even when the heating is turned off.

It was suggested it might be a faulty diverter valve, so has WB come out and replace it, but problem is still occurring.

Bathroom rad is not linked in to hot water system as far as I'm aware.

Any thoughts?

Cheers

Has it always been like that, or a new problem?

 

[Custom45]

Has it always been like that, or a new problem?

Always been like it.

Worcesterbosch replaced a diverter valve as it was under warranty, but still same problem.

 

[ianmcd]

Does your boiler also heat aHW cylinder as well as the rads ?

 

[Custom45]

Does your boiler also heat aHW cylinder as well as the rads ?

No, it's an oil fired combi, rads and on demand hot water for taps and showers.

 

[oldbuffer]

1. Make sure no hot water is used, then turn the bathroom radiator on full and switch the heating on.
2. If the radiator heats, then it is connected to the central heating circuit.
3. If it doesn't heat, then assuming it isn't faulty, it is:
3a. Not connected to anything. OR
3b. Connected to the hot water circuit.
4. If the previous boiler had the bathroom radiator connected to the hot water primary circuit, it may not have been moved across properly when the current boiler was installed.
5. Although you have a combi, have you retained the hot water cylinder. If so, and the radiator is still connected across the primary coil of the cylinder, it will be picking up heat from there.
6. Beyond this, you are going to have to investigate where those radiator pipes are run and what they are connected to.