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7iE Smart Matter Thermostat
Why is my floor temperature reading incorrect?
If your temperature readings on your thermostat are inconsistent with the actual temperature of your floor, it is likely due to an error in the sensor probe wire’s installation. By following the suggestions provided, you can identify and address any issues that may be affecting the accuracy of your thermostat readings, ensuring a more comfortable and controlled environment in your home.
Why is the temperature on my thermostat higher or lower than the actual temperature of the floor?
Incorrect temperature readings on a thermostat are often the result of an incorrectly installed sensor probe wire. There are two main causes of incorrect sensor probe readings.
The sensor wire is installed too close to the heating cable.
Installing a sensor probe wire off-center and too close to a heating cable will cause the temperature to read higher than the actual temperature of the floor. The temperature will naturally be hotter directly next to the heat source, so if the sensor probe wire is placed too close, it will incorrectly read a higher temperature than the actual temperature of the floor.
When installing the sensor probe wire, it should be equidistant between two heating cables to ensure an even temperature reading.
The sensor wire is installed in the same conduit as the heater’s cold lead.
Installing the sensor probe wire in the same conduit as the heater’s cold lead can create interference between the cables. This interference can cause the sensor probe wire to send incorrect temperature signals to the thermostat.
Warmup recommends a separate conduit for the sensor probe wire and the cold leads to avoid interference which may cause incorrect temperature readings.
Test the resistance of the sensor wire.
If the sensor probe wire has been installed correctly in accordance with the above, it is possible that there is damage to the sensor probe wire, cause it to not work properly.
Using a digital multimeter, test the resistance of the sensor probe wire on a 20K-ohm scale. An acceptable resistance will be between 7 and 17 ohms. If the resistance is outside of this range, the sensor probe wire is damaged and should not be used.
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How do I fix incorrect temperature readings on my thermostat?
If you have determined from the above that the cause of the incorrect temperature readings on your thermostat is from the sensor wire, there are a few different ways you can remedy the issue.
Check for a second sensor probe wire.
Warmup recommends that 2 sensor probe wires be installed for all underfloor heating installations. Check the system for a second sensor probe wire. If the second wire was installed correctly, it can be connected to the thermostat instead and used as the main sensor.
Correct the sensor wire’s conduit placement.
If only one sensor probe wire was installed (or if 2 were installed but incorrectly), you can correct the wiring by moving the sensor probe wires into their own conduit, separate from the heating cable’s cold lead.
> Click here for more information on the conduit requirements for an underfloor heating system.
Offset the temperature reading in your thermostat’s settings.
You can continue to use a sensor probe wire that is showing incorrect readings by offsetting the temperature reading in your thermostat’s settings.
For example, if your thermostat is displaying a temperature of 80°F but the floor’s actual temperature is only 75°F, you can set the thermostat’s temperature offset to -5° so that the temperature reading matches the actual floor temperature.
Change your sensor usage from Floor to Air in your thermostat’s settings.
If your temperature variance is greater than 10°F, it is recommended to use the thermostat’s internal air sensor to control the thermostat, rather than the floor sensor. This can be adjusted in your thermostat’s sensor settings.
> Click here for more information on sensor applications and how to adjust them.
Contact Warmup for further assistance.
If you are still experiencing issues with your heating system after troubleshooting with the steps above, please contact us to further assist.
We can be reached by email at ussales@warmup.com or by phone at (888) 927-6333.
