What if the Sensor Probe Reads Higher or Lower than Actual Temperature?
3iE Energy-Monitoring Thermostat
Sensor Probe Reads Different than Actual Temperature
The sensor probe reads higher temperatures than actually felt on the floor most typically when the sensor probe is placed too close to the wire.
If your thermostat is reading a temperature different then the actual floor temperature, here are a few things to check:
1. The sensor probe should be installed equidistant between two heating cables.
Placing a floor probe off-center and too close to a heating cable will cause higher probe readings than the actual floor temperature. On the contrary, placing a floor probe too far from a heating cable will cause lower probe readings than the actual floor temperature.
2. The sensor probe wire should be installed in a separate conduit from the cold tail lead
If the floor probe is reading significantly colder or warmer, or if temperature readings are sporadic, contact your installer to see if the sensor probe was placed in the same conduit as the cold tail lead. Warmup recommends a separate conduit for both to avoid interference which may result in incorrect temperature readings.
3. Test your Floor Probe
On a 20K scale, the Warmup floor probe should read between 7-17.
If you have discovered that your sensor probe is installed in its own conduit and its resistance is in range, check for a backup floor probe in the wall. Common practice is to install a backup. If you do not have a backup floor probe, you can correct the sensor reading by using the OFFSET feature in the advanced settings of your thermostat. One example is when the reading is 80F but the floor is only 75F. OFFSET your sensor by “-5” and give it five minutes to re-calibrate. The sensor will now adjust to its new range and scale.
If your variance is wider than 10F Warmup would recommend working with the ambient feature of the thermostat instead.