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Floor heat quit working


rlswan

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Floor heating cable was installed a little over 3 years ago. Last March the GFIC code came on the thermostat and the instructions said to reset it and if it would not reset to replace it. We did replace it but the same happened with the new one. Installer has worked on it for 8 months now with no success to find cause. It is a Warm Tiles system and their tech haven't been of any help either.

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amonra

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If the fault is caused by leakage from the heating cable to earth, then a possible work-around is to fit an isolation transformer between the mains and the heater cable. It doesn't clear the fault, but it will stop the sensor "seeing" a leakage, and will avoid digging up the floor.

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Wilham

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riswan. You have a repair kit and wiring plan, so locate the break with a good quality live wire detector.

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Wilham

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I know in my suggestion you likely need to by-pass the thermostat to let through the mains. Also missed from my post,- a cheap live wire detector can be used if after the first run you interchange live and neutral feeds. Then the detector will approach any break from the opposite direction and narrow the location. If there is no break, the detector signal strength will decline as it tracks from live end.

After these checks have been made, amonra's clever idea using an isolation transformer could be the answer. Downside is you have to find somewhere to put it; and perhaps more difficult, you have to comply with the now legal requirement and have this job checked and passed by someone qualified.

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Forum Editor

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Almost all earth-leakage faults on underfloor electrical heating installations are the result of damage to the cable - either during installation or during the tiling process.

Another possibility is a faulty connection to the mains, but if you're getting the error at the programmer/room-stat it's more likely to be a cable fault under the tiles.

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