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Post by jsouthwell on Sept 7, 2013 15:36:28 GMT -6
We have a SunTouch Floor Hearing System with a SunStat thermostat (Not a SunStat Pro). It had recently started tripping the GFCI and now is to a point that the second there is a call for heat, the GFCI trips. This system worked flawlessly for over two years. Everything that I read suggests a break in the system but there has been no damage to the floor and the wires to the thermostat are protected.
Is it possible the thermostat itself is failing? Should I try replacing it first before I consider trying to find a break in the system that may not exist?
Any input would be greatly appreciated.
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Post by jackthedog on Jan 5, 2015 2:30:20 GMT -6
I have the same problem. It worked for a while and now the GFI trips instantly. I tried another thermostat and the GFI tripped the same. I bypassed the GFI and the floor heated up fine, everywhere. I tried rewiring the box and all the connections, made sure everything was well separated and it still tripped. Nothing has changed on the floor. Why would it suddenly start losing to ground. Maybe the wire insulation has melted or decayed? Its only a few years old and I don't want to rip up the entire floor! Never again use this product!
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Post by sully150 on Feb 8, 2015 17:57:06 GMT -6
I have the same issue as Jackthedog, I have a Sunstat Pro model 500670 that is just under 2 years old and nothing has changed on the floor. I tested the resistance on the mats as well as the sensor and all 4 mats and the sensor seem to be working as expected. The system was working fine for most of this winter, but all of a sudden, the GFCI keeps tripping. I have not yet tried a new thermostat (it will be arriving in about a week). I bought the setup in Mar 2013 and it was installed in May, so not that old and certainly not that much use. Perhaps there is some pointers someone could provide on how I can troubleshoot the issue. I would not want to tear up the expensive kitchen floor.
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Post by gaverill on Feb 25, 2015 13:50:50 GMT -6
I had the sme problems with 81015385 Sun Stat Pro II and some Warm Wire Cable in our new bathroom. I changed the GFCI breaker in the breaker box and it has not tripped since. I asked an electrical supply rep about it and he told me that these breakers get pretty touchy after they have tripped a few times and any type of measured interference in the circuit can cause nuisance trips.
I have not had to reset the breaker or stat since.
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Post by mrfixit on Apr 9, 2015 19:35:18 GMT -6
Actually circuit breakers in general degrade slightly each time they are tripped, and will become more sensitive over time, to the point where they need to be replaced to be of any use.
I personally have dealt with old circuit breakers which wouldn't even allow close to 15A without tripping.
So this raises a question of the circuit that the floor heating cables are wired into, and how often is this circuit being tripped?
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Post by zagnutbar on Dec 7, 2023 14:07:14 GMT -6
Ok, so I have a similar issue.
1 Installed 2 10 amp matts on one breaker.
Upgraded from 15 amp to 20amp based on GFCI errors triggering.
Upgraded from 20 to 30 amp... because it kept triggering.
All mat wiring is within spec.
At this point the bathroom and mudroom are complete, the mudroom Tstat trips every couple hours but it heats up... the bathroom trips instantly. I have removed and re-installed twice.
Is there a recommended breaker I should be using for these Matts, They are the only devices on this breaker.
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