I have had the SunTouch 755 for 4.6 years and it has started to trip the system C/B. Any ideas on whether it might be the control unit or the floor wring? I am leaning towards the control unit. has anyone else seen this issue?
Post by btwhitehurst on Dec 11, 2017 14:43:09 GMT -6
Was it the panel breaker or the GFCI in the thermostat? Those thermostats have a limited life due to the GFCI and need to be replaced. It is from the date of manufacturer. So the Install date does not always indicate if it is a "new" thermostat. You may get an Err7 or End-of-Life error on the stat.
Once you have the thermostat out to check the date of manufacture. Disconnect the LOAD wires. Do a resistance check between the load wires and between each wire and the shielded ground. The resistance should be between 134 to 10 ohms between the wires and Infinite "open" between each wire and the shielded ground. This test is outlined in the installation manual.
Brian Whitehurst Pexheat.com Radiant System Design & Sales www.pexheat.com 888-470-2757