Central Heating Problem

[glanlay]

I have a Glowworm Swift Flow 80 Fanned Flue Combi Boiler. Recently I have had the Expansion Vessel changed and as water was still coming out of the overflow a new pressure valve and pressure gauge were fitted which cured the overflow problem. However the pressure reading of 1.5 drops to zero in a matter of 2 or 3 hours so that it constantly needs to be topped up.

On the upper floor I cannot see any leaks which I think would quickly become apparent in the ceiling. On the ground floor there are also no visible leaks. The radiators appear to be okay with no air venting required. As long as I have brought the pressure up to 1.5 all radiators get hot and I can get hot water in the bathroom. However the problem persists, with pressure dropping to zero in a matter of a few hours after bring the reading back to 1.5.

Any help on where the problem might be would be gratefully received.

 

[fuzzy]

I have a Glowworm Swift Flow 80 Fanned Flue Combi Boiler. Recently I have had the Expansion Vessel changed and as water was still coming out of the overflow a new pressure valve and pressure gauge were fitted which cured the overflow problem. However the pressure reading of 1.5 drops to zero in a matter of 2 or 3 hours so that it constantly needs to be topped up.

On the upper floor I cannot see any leaks which I think would quickly become apparent in the ceiling. On the ground floor there are also no visible leaks. The radiators appear to be okay with no air venting required. As long as I have brought the pressure up to 1.5 all radiators get hot and I can get hot water in the bathroom. However the problem persists, with pressure dropping to zero in a matter of a few hours after bring the reading back to 1.5.




Any help on where the problem might be would be gratefully received.

you are obviously loosing water somewhere. either a eak or through the expansion valve blow off which i think u r calling an overflow

check the blow off, if not from there u defo have a leak somewhere. find out then post again

 

[wnjswozo]

get the plumber to put some internal leak sealer in,you may have a small leak somewhere inaccessable/also get him to recharge exp vess

 

[glanlay]

Many thanks for those replies, I will try what you have suggested.

 

[WHPES]

If you're loosing as much as that, leak sealer won't work, but I'm surprised you aren't noticing any wet patches.

Check the blow off first and if its not that, the next way is by process of elimination - isolate separate sections and pressure test until you find the source.

If you can, place a cup under the blow off outlet and see if it fills.

 

[glanlay]

If you're loosing as much as that, leak sealer won't work, but I'm surprised you aren't noticing any wet patches.

Check the blow off first and if its not that, the next way is by process of elimination - isolate separate sections and pressure test until you find the source.

If you can, place a cup under the blow off outlet and see if it fills.

There are two rads on the ground floor where the pipework is buried underneath a laminated floor but no damp is apparent. However as the pressure drops rapidly I havent seen any water escaping via the blow off. I am going to see how I can isolate the ground fllor rads. Thanks for your reply.

 

[fuzzy]

yep, youll have to start isolating sections to try to find it

 

[glanlay]

Is it possible to isolate the rad circuit by closing the valves on the flow and return pipes as they come out of the boiler?