Moaning noise from gas heating system

[hen house]

Gas boiler and underfloor heating system. Just starting making a loud moaning noise which lasts 3 seconds every 20 mins when system running. Any suggestions please?

 

[chrishutt]

Difficult to diagnose without any information about make and model of boiler. Suggest you try to find a competent engineer to have a listen.

 

[hen house]

Boiler is Ideal Mexico 2

 

[chrishutt]

Does the noise coincide with anything else happening in the system - e.g. the boiler thermostat cutting out and the flame going out? No chance of a diagnosis unless you give a lot more info.

 

[bengasman]

Who is doing the moaning?

 

[megawatt]

The plumbers have left their apprentice behind under your floorboards ... Regular occurence, it can take weeks to miss them