Tech Tips: Troubleshooting a GFI Issue

When you’ve installed a thermostat for a heated flooring system, if you see “GFI” displayed on the screen, that means that there may be a ground fault in the system. If you have a GFCI breaker that could be the cause, and it could also be because there is resistance between the wire and the ground. Testing for a ground fault is done by using a digital ohmmeter to see where ohms are coming from, and if there is any read from the black wire to the ground or from the red or yellow wire to the ground, you’ll need to fix the issue. In this video, you’ll learn how to test for and troubleshoot a GFI issue.

Troubleshooting a Radiant Heat System GFI Issue