Underfloor Heating Fusing

[ithomson]

My underfloor heating in the kitchen has run perfectly for 2 years since installation.

Last night I noticed it wasn't working so I changed the fuse in the 13a fused connection unit. It blew immediately.

The underfloor heating runs off its own spur from the consumer unit.

Anybody have any ideas?

 

[davelx]

There's a short in the underfloor heating element or the cable from the FCU leading to it?

Check the resistance with a low-reading meter to confirm - assuming you know what the loading is supposed to be you can easily work out what the approx. value should be.

 

[sm1thson]

have you checked for wet patches (eg under sink and washing machine). and i take it there hasnt been any other alteratins in the kitchen recently.

 

[ithomson]

Thanks for the suggestions.

Why would it start shorting after 2 years of continuous service?

I've made no alterations to the kitchen and its a title floor so water shouldn't make any difference (although I will check).

 

[Steve]

I've made no alterations to the kitchen and its a title floor so water shouldn't make any difference (although I will check).

damp
winter
rain
wind

Though the extent to which damp would effect EUFH will vary by manufacturer, since they are built differently. I wouldn't expect the effect to be enough to blow a fuse, TBH.

 

[ricicle]

How is it controlled, if it is not self regulating then has the controller perhaps failed (relay contacts welded in and the element has overheated and burnt through/down to earth