Skip to main content

Ready to hire?

Post your job in minutes, browse real reviews and choose who to speak to.Post a job

Need some tips or advice?

Ask a question
Central Heating

pressure loss on boiler every time toilet is flushed. Brand new Boiler

Anonymous user 03/03/2024 - 3.37 PM

Gas safe Engineer installed new gas boiler and heating. Then another plumber installed the downstairs loo. Now when I flush the toilet the boiler loses pressure to zero and has to be filled every day. Even if I do not flush toilet pressure drops and I refill every day. There NO leaks anywhere. The plumber did connect to two pipes near boiler. Whats wrong and what can be done? Is it some form one way valve he should have fitted? Thank you all for taking time out to reply - some of you asked if it is hot water when flushed = NO. It is Def connected to cold pipe supplying cold water to boiler, this is T also to toilet cistern & cold tap Hot water from boiler , T to supply tap on vanity sink Is there some easy fix eg one way valve ? I cannot call plumber who did the job as he is now in Poland (from Rated people). Alternatively , ripped out wall tiles & plaster board in wall and ceiling and take a connection from bathroom pipes above.

Are you a tradesperson and able to answer this question?

Log in

8 Answers

Martin House Plumbing Services

Rating: 4.8 out of 5
Lymington
Bizarre ! For some reason the supply pipe to the toilet has been connected to the heating system. Someone has done something very wrong which should be looked into immediately. There is probably (should be) a service valve on the WC supply pipe. Close it, 1/4 turn & use a bucket to flush the loo. Get someone in to check out who's done what. This is all wrong, the 2 should be completely separate.
Answered17 March 2021
1

Maine plumbing and tiling

Rating: 5 out of 5
Cheltenham
How strange, I do not know the answer, I would call the boiler engineer and let him know the problem, you may need to send him a picture of the 2 pipes the plumber connected together, He should be able to advice you best and get the problem solved Good luck
Answered17 March 2021
1

L Watkins

Rating: 4.9 out of 5
Mountain Ash
Sound like the second plumber connected the heating pipe work to the toilet
Answered17 March 2021
1

Gas cert plumbing and heating

Rating: 5 out of 5
Hailsham
Which boiler has been installed. Ie combination or system . Is the water in the toilet cistern hot when heating is on ? Seems highly unlikely but with some of the workmanship out there it could of been connected to the heating system . Would get the second plumber back to rectify the issue
Answered18 March 2021
1

PMK-Plumbing Ltd

No reviews yet

Welwyn Garden City
Water pipe feeding the toilet cistern is connected to central heating system, when running radiators flush toilet and check if flushing water is warm. Checking filling loop will not give results as there is double check valve fitted.
Answered25 March 2021
1

Lowe's Plumbing and Heating

No reviews yet

Cambridge
test your water inn the cistern with a litmus paper, this will tell you if the water is contaminated with inhibitor if any left, also run system and flush toilet if hot id suggest you call him back. drop the pressure one boiler and see if the toilet fill like mains pressure?
Answered17 March 2021
0

lds specialised developments

Rating: 5 out of 5
Redruth
Check he's not left the filling loop valve open?
Answered17 March 2021
0

ACH

Rating: 5 out of 5
Cricklewood, London
The plumber you connect the wrong pipe he connect the central heating pipe fitted the water
Answered18 March 2021
0