Poor Heating but HOT water

4 Mar 2014
Reaction score
United Kingdom
Just moved into a new property and trying to figure out why the radiators are not heating to full potential. Here are a few facts about the system.

Old Camay Quartet Oil boiler with flow and return direct to hot water tank (no thermostat) coming from right side of boiler (no pump on this side). On the left side of boiler there is a flow and return to heating with a recirc pump in the flow. There is no 3 port valving and the heating controller appears to activate heating AND hot water flow when "CH" is selected and hot water only when "HW" is selected. So when the CH is turned on the HW flow and return heat up very quickly and the boiler cuts out after only a few minutes and only restarts after approx. 10 min (or if the boiler temp knob is turned up).
So it looks like the hot water circuit is cutting off the boiler before it has a chance to heat the CH side of the boiler. Certainly, when it cuts out the CH flow pipe is quite warm but CH return is pretty cool indeed, while the both HW flow and return are scalding hot.

Any suggestions please???
Sponsored Links
Thanks Simon...you were spot on. I assumed that because the pump was humming, it was turning. That assumption was incorrect...I tapped it with a big hammer and the pump sprung to life.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links