underfloor heating

23 Oct 2010
Reaction score
United Kingdom
i've got an error message on my thermostat on my underfloor heating. It says external failure. Its a warmup x-stat. Can i just disconnect the floor sensor thats wired into the stat to get it going temporarily?
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Look at this document

xstat external error procedure

Follow the guidance.

Job done.

Let us know how it goes..... ;)

EDIT: The XSTAT will not work unless a probe is connected and it is returning a valid result (resistance).
It may be possible to program the XSTAT to only have air temperature detection. It depends on the model..

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