NEW gas boiler losing pressure

Question

Gas safe installed new gas boiler and heating. Then another plumber installed 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 everyday.  The plumber did connect to  two pipes near boiler. Whats wrong and what can be done?

Ryan · Accepted Answer

He’s connected to flow and return at boiler either that you have a leak on your heating pipes why did connect to two pipes at boiler ? He only needed to connect to cold water

Jaime · Answer

In this case Heating system losses of pressure could be wrong pipework installation. I would recommend a plumber/gas safe engineer to check your domestic and heating pipework. I hope this helps.

Ryan · Answer

Seems like the toilet has been fed off the circuit in my opinion

Martin · Answer

The answer is in the question!
If the first guy was gas safe registered, get the second plumber back to resolve the issue.

Ravinder · Answer

I think you need an engineer to attend and diagnose, I don't think you will get an answer like this.

Johnson · Answer

There must be leakage along the joints or at the radiator, it could be dropping slowly.
Since it is a new boiler I will rule out the expansion vessel losing air pressure

Craig · Answer

There are a couple of possibilities. 1; there could be a small leak somewhere on the system. The system only needs to lose a small amount of water to drop the pressure. 2; the blow-off valve may be letting by. This is located on the outside of the building, you should be able to see if this is dripping. 

The installation of the toilet will have no impact on the operation of the central heating system.

Peter · Answer

Very unlikely its to do with your toilet. 
You're losing pressure out the system either frin the Prv or from the Pipework somewhere. 
You need to get someone to have a look at the system whilst know what they are doing. Thank you PH Gas Services

Jay · Answer

Unfortunately without seeing the job it is impossible to say, if you keep filling the boiler it will eventually break.
I advise getting an engineer to take a look, he possibly connected wrong pipes

Dan · Answer

I believe you have small leak but just to see how faster drip the pressure or in heating central need to change something

NEW gas boiler losing pressure

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