Baxi Duotec instant pressure drop

[owington]

Hi,
Have a bit of a strange problem with a baxi duotec 28. When the CH is turned on the pressure instantly drops by 1/2 bar. All rads get hot and seems to be working fine. Over several weeks the pressure is gradually dropping so needs topping up. The expansion vessel is fine and there are no signs of leaks anyway or discharge from PRV. When the CH is turned off the pressure jumps staight back up by 1/2 bar again. Any ideas what to look for.
Thanks

 

[Billy Bob Bob]

if the pressure gauge drops by 1/2 a bar but goes back up by half a bar when ch is turned off its nothing to worry about its just the gauge is on the negative side of the pump however if its losing pressure over a few weeks you have a leak somewhere

 

[owington]

Thanks mate, I just called into the job on the way home for a mate who had fitted a radiator a few weeks earlier. when i called him he said the pressure wasnt dropping like that when he left. Maybe he just didnt realise, i dont know. Cheers anyway, i will tell him to go back and check pipework under floors.

 

[JerryHumphries]

Hi, if you do suspect a leak and don't want to rip up the flooring it might be a good idea to get a leak detection company in to source the problem for you. I know of one company I've used before. [DLMURL]http://www.polygonleakdetection.com[/DLMURL]. They use non destructive methods and have saved me a fortune recently. Check them out, you won't regret it!