Underfloor heating help!

[Wayne Gollop]

Hi there,

i had a job today where the customers underfloor heating stopped working.
i tested the mats and both were reading 32 ohms.
he had a spare controller stat so I changed it.
The stat sends 240v to the mats. But as it takes a while (he says it can take a good hour in his house) and with the could weather would probably be longer. So I left. (The customer is a friend)
he has just texted me saying that its still not working.

Any ideas??? What have I missed????

the only thing I can think of is the sensor?

Its puzzling me.

wayne

 

[Wayne Gollop]

The sensor also has to match the thermostat too otherwise it will send it the wrong information so you need to measure the probe resistance and check what the thermostat needs

Luckily I've got the sensor which came with the stat. But as for replacing it, I haven't got a clue how I'm gonna do it as the previous spark has filled the cables in the wall with no cappin or conduit!!

 

[monkeyelectric]

Luckily I've got the sensor which came with the stat. But as for replacing it, I haven't got a clue how I'm gonna do it as the previous spark has filled the cables in the wall with no cappin or conduit!!

Have you tested it to make sure it is that before going to all that trouble?

 

[tom79bmth]

Just cut the old one out, find best route to the floor and pop a tile up and install as manufacture requires but put in conduit,

 

[amlu]

connect the element straight to l-n wires, bypassing the controller, get some kind of thermometer lay it on the floor. if its really cold up there you may not notice temperature rising without one,.

 

[Mork]

Depending on the type of stat you have, its possible to reprogramme the stat to operate on air temprature only,this eliminates the floor sensor altogether and allows you to test the heating, if it still not working after that I think its the stat.

 

[Wayne Gollop]

It's carpet, thick carpet too.! 20mm thick! The stat was an eBay job by the customer. And it's a very basic stat. I don't think you can do it air only. But I haven't looked into it.

 

[Guitarist]

Maybe walk away? You are spending far more on this job than you will ever get back. Tell the customer to get the original electrician back to sort it.

 

[Wayne Gollop]

Maybe walk away? You are spending far more on this job than you will ever get back. Tell the customer to get the original electrician back to sort it.

Not as easy as that. it's a friend.

 

[Guitarist]

Not as easy as that. it's a friend.

Oh dear. Let's hope they still are in a few days...

 

[Wayne Gollop]

Oh dear. Let's hope they still are in a few days...

Ha ha yeah. Gonna be interesting.