We have a SunStat View thermostat (model 500750) in a new installation. The thermostat intermittently reports "Err3: Floor sensor missing".
We have two in-floor temperature probes which both read 11.5 kilo ohms when not attached to the thermostat. We also have a spare probe -- one that came with the thermostat -- which reads 11.5 kilo ohms.
I'm sure that the probes are securely attached to the set-screw terminal strip. I notice the same problem if I use the second in-floor probe wires. I also experience the same intermittent problem even when using the loose, spare thermostat probe.
Is this thermostat defective? How can I further diagnose the issue?
Post by Christopher on Aug 31, 2012 7:17:39 GMT -6
Err3 generally is a result of wiring the power to the stat before wiring the sensor. To clear this up go ahead and disconnect the sensor then shut down the power at the breaker. Give it about 60 minutes or so to ensure it is reset, then wire the sensor back up and turn the power back on. If it comes back with Err3 again, do a factory reset (under the setup menu).