Central Heating

Would central heating works (including increased pressure of Vaillant combi boiler) have done any damage?

Anonymous user 03/03/2024 - 3.07 PM

Trying to save some money, I decided to replace a radiator and some pipe work myself with my friend. All was going too well, drained the system, put inhibitor in it, did the small amount of pipe work that needed to be replaced then switched on the boiler and started to bleed each radiator. Unfortunately I left my friend to bleed the last of the rads upstairs and went downstairs to put the washing out... Doing that girlie thing. However whilst I was downstairs he called down to say that he wasn't getting anything out of the second rad and I looked on the boiler and the pressure had dropped to .3 so he closed the bleeding valve up and I put in some more water up to 1.0. Again he moved on to the third rad and it happened again so I put in some more water again up to the 1.0 mark. After about two mins there was an loudish blurring noise followed by him asking me for any rags as he had heard water leaking from somewhere. He didn't realize that I had another rad in the back bedroom which had forced the bleeding valve to unscrew and water had gone everywhere. Thought it was all going too smoothly. Anyway, consequently the pressure on the boiler had gone up to 3.9 which I noticed about half an hour afterwards. I immediately drained off the access water out of the draining valve by the combi down to 1.0. Went away for two days and saw that it had again gone up to 2.9. No one had used it as the house was empty. All seems ok now but would this have damaged the boiler (Vaillant combi) in any way or anything else? The boiler does seem to be a little rattly or noisier but that might just be me being paranoid. Ps no leaks anywhere thank god

Ventures Plumbing & Heating

Rating: 5 out of 5

5/5183 reviews

Wisbech

if the boiler hadn't been used in the time the pressure increased, then it is possible you have a faulty filling valve. if the filling valve is part of the boiler vaillant boilers have unreliable valves and sometimes need replacing. it is possible the expansion vessel is ruptured or it my just be that it need topping up with air. in both instances it is recommended the prv needs replacing

Answered21 April 2014

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Boiler Homecare

Rating: 5 out of 5

5/536 reviews

Honiton

You have a ruptured expansion vessel, this will cause the pressure to rise, as this item of equipment takes up expansion as the name of the equipment suggests. This job is only to be carried out by a qualified heating engineer, he may also recommend the PRV (pressure relief valve) is changed at the same time. MyBuilder.com will not allow us to give you a costing of this work in their public forum. A little worried by a statement you made 'then switched on the boiler' I hope you meant that once the whole heating system was filled with water and bled of air before you switched the boiler on?!

Answered16 April 2014

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