Radiators turning on when hot water used

Question

Why do my radioators turn on when the hot water tap is turned on? We've  turned the dial on the boiler to "water only" but it  hasn't worked. We have an ideal combi boiler. Is this something we could fix ourselves or would we have to get a plumber in? If so, how much would this cost? Thanks. Much appreciated for any advise.

Shane · Accepted Answer

Hi there, it sounds to me like the diverter valve is faulty but you will need to get someone out just to carry out tests and confirm, unfortunately you will need a engineer to carry it out and depending on the company is will probably cost between 130-300.

Omar · Answer

The boiler diverter stuck on the mid position, need replacing

Fergus · Answer

This is the divertor valve in the boiler…. You need a gas safe plumber.

Mohammed · Answer

You would need an engineer. Most likely the diverter needs changing or the plate to plate is clogged up. Give us a call on Bradford  752 852 for free phone advice. 

Mr Reactive

Hussein · Answer

Hi Zaheera, it seems like your diverter valve is faulty and will need replacing. You will need an engineer to replace this.

FYI;
What is a diverter valve?
A diverter valve is a mechanism in a combi boiler that opens or closes to direct hot water either to radiators or taps and showers. Diverter valves are not found in system or conventional boilers because the valve is only needed in boilers where water is heated on demand, whereas system and conventional boilers store hot water in a storage cylinder.

If a specific hot water tap is turned on, the combi boiler will heat water and the valve will direct the hot water to the tap rather than to the home’s radiators or other taps. If the heating is turned on, the combi boiler will do the same for the radiators. If the heating is on and someone turns on the hot tap in the shower, the diverter valve will prioritise sending hot water to the shower instead of the radiators until the shower is turned off.

Hope this helps.

Kind Regards,
Hussein
HJ Plumbing LTD

Paul · Answer

It sounds like the diverter valve within the boiler is stuck in mid position which is allowing heated water to pass into your heating system.replacment diverted valve is about £30 and would need to be fitted by a plumber

Mike · Answer

It sounds like the diverted valve is stuck in mid position. The diverted valve directs hot water to either you radiators or hot water. You need to call a plumber for a quote

Stuart · Answer

The "changeover valve" is worn.

Radiators turning on when hot water used

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