Any heating engineers?

mothy said:

Any ideas?

My combi boiler heats the water & the central heating fine, but my under floor heating cuts in but turns off after about 10 minutes = isn't working, whereas it used to. It then stays off & won't turn back on for an hour or so.

Exciting stuff I know, but before I call out a heating engineer, any suggestions? (It's a 2 zone system)

Thanks

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beorhthelm said:

only because i had a problem this weekend, check your system's pressure. if it drops too low it may stop feeding all parts of the system.

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gasgull said:

Difficult to diagnose remotely.
Pressure is always an issue needing checking.
dependant on What system controls you have,Two things to check.
If it's a poly pipe system you may have a FRU unit which has a seperate pump and mixing valve on the underfloor pipework,worth checking them.
Also you say twin zone valves,the syncron motors in these valves can fail when they get hot causing valve to spring return.ie cutting flow. Boiler would then be flowing through bypass which would be a while before cooling down and firing back up.

Click to expand...

gasgull said:

Difficult to diagnose remotely.
Pressure is always an issue needing checking.
dependant on What system controls you have,Two things to check.
If it's a poly pipe system you may have a FRU unit which has a seperate pump and mixing valve on the underfloor pipework,worth checking them.
Also you say twin zone valves,the syncron motors in these valves can fail when they get hot causing valve to spring return.ie cutting flow. Boiler would then be flowing through bypass which would be a while before cooling down and firing back up.

Click to expand...