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The Radiant Journal

A technician uses a digital multimeter to test the electrical resistance of snow melting heating cable leads, with the green heating cable and mesh mat visible in the background. Text overlay reads: "CAT.III
600V~
400A~
GREENLEE® CMT-80
AUTO SENSE
14.1 Ω
HOLD
AUTOMATIC
TESTER
V~ 1.3V - 600V
V- 1.8V - 600V
-0.6V - -600V
A~ 0.6A - 400A
Ω 0Ω - 2000Ω
•))) ≤25Ω"
Julia Julia October 2026

Electric Floor Heating Diagnostics: A Pro Field Guide to Troubleshooting Tile Floors

A step-by-step field guide for electricians and installers: the three ohm tests, megohmmeter testing, floor sensor readings, a 4-step GFCI trip flow, and how to find a fault without tearing up tile.

Read Article → 14 min read