Loud bang when heating switches off

[Matthew Turner]

Hi,


I have recently moved into a new property where the heating had recently been installed, I have renovated the house so the boiler has been relocated and the radiators were all removed then refitted, the system is a gloworm boiler with two zones upstairs and downstairs with separate thermostats. There are no problems when the heating is running, but when the thermostat clicks off there is a single loud bang that sounds like it's the pipes between the floors??
Does anybody have any idea what it can be?
Thanks in advance
Matty

 

[Scott_D]

Post some pictures if you can. May need an auto bypass valve

 

[townfanjon]

Who moved the boiler Matty ?

 

[Unregistered]

What do you want photos of Scott?
It was moved by my brother in Law, he is unsure on the fault though,

 

[Scott_D]

under the boiler
the zone valves

 

[julesverne]

Is he gas safe registered?

 

[Unregistered]

Yes he's gas safe registered?

 

[Unregistered]

I'll get some photos tomorrow Scott

 

[lame plumber]

I'd say your brother in law has caused an issue with a pump working still whilst a valve is closed causing a problem and hence a bang, or leaving a nice big dead leg somewhere with a load of air in it which can make pipes bang. you might want him to have a look at the setup again and sort it out for you.

 

[josh]

Zone valve the wrong way around where i'd look first, have seen it before.