Noisey back boiler

[kedsy]

I have Baxi boiler with gravity water and pumped CH. Every so often there is quite a loud bang from the boiler as if its expanding/contracting. Is this normal with back boilers?

 

[kevplumb]

in a word NO

 

[kedsy]

What could be the cause of this, is it knackered boiler?

 

[kevplumb]

usually sludge in the system bakes hard in the heat exchanger causing localised boiling try a cleanser in the system for a start

 

[kedsy]

Cant try a cleanser as its a primatic system.

 

[kevplumb]

in which case the only way is to remove the heat exchanger and have it descaled
btw how many pc do you post off

 

[kedsy]

in which case the only way is to remove the heat exchanger and have it descaled
btw how many pc do you post off

Would this be a major job?

What you mean how many PC do I post off?

 

[kevplumb]

sorry went off at a tangent
no offense

 

[kevplumb]

yes its a major job could consider having the cylinder replaced

 

[kedsy]

Thanks Kev,

If I have the Cylinder replaced would it be better to change it for a normal indirect cylinder then put an extra tank in the loft? Then in future I would be able to add cleaning solutions.

 

[kevplumb]

yup got it in one
still need the heat exchanger cleaning tho