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Why is my floor heat not working even though there are no error messages on my thermostat?
If your underfloor heating system is not working properly but there are no error messages on your thermostat, follow the below steps to troubleshoot and restore your floor heat to proper functionality.
Check your thermostat’s heating settings.
The first step is to check how your thermostat is programmed to confirm that your floor heating system is scheduled to be active at the correct times. Check for the following settings on your thermostat:
Is the heating indicator on?
When your thermostat is actively heating the floor, you will see the heating indicator on your thermostat’s screen. If the indicator is on but the floor is not heating, the issue is likely not within the thermostat’s programming. If the indicator is on but the floor is not heating, it is likely that the thermostat is not programmed correctly.
Is the heating off?
If you have previously turned off your heating, this will override any existing schedules or heat settings. In your thermostat’s settings, ensure that the “heating off” setting is not turned on.
Are your heating schedules correct?
Navigate to your thermostat’s “heating schedules” setting. Check the times that your thermostat is scheduled to heat the floor for each day to ensure that the correct times are selected. If the scheduled heating times are not correct, edit them to reflect the times you would like the system to activate. Continue to monitor your system over the coming days to see if the issue has resolved.
If in Manual Mode, is your target temperature set?
If you are using your thermostat in Manual Mode rather than using an Automatic Heating Schedule, ensure that you have set your thermostat to the temperature you would like it to heat to.
Adjust your thermostat to accommodate how the floor heating system was installed.
There are a couple of factors during installation that can have an effect on the performance of your floor heating system. Confirm the below with your installer and adjust your thermostat settings accordingly:
Floor Sensor Installation
If the floor temperature shown on your thermostat is higher than it should be (ex., is reading 90°F but the heating is off), this is likely because either the floor sensor was installed too close to the heating cable or the cold lead from the heating cable was installed in the same conduit as the floor sensor cable. The interference between these two cables can cause incorrect temperature readings.
To fix this, change your thermostat’s sensor application setting to activate based on the room temperature instead of the floor temperature. Your thermostat will now disregard the floor sensor reading when determining when to activate the floor heating system.
Insulation Installation
When installing floor heat over a concrete slab, it is recommended to use a layer of insulation between the subfloor and the heating system. This will help to redirect the heat upwards rather than letting it sink into the concrete slab. If insulation was not installed between the concrete slab and the heating system, you could be experiencing delayed heat up times as a result of downward heat loss.
To fix this, increase your setback temperature and adjust your heating schedules:
Increase your setback temperature.
The setback temperature setting is the minimum temperature that your heating system will continually maintain, even outside of regular programming. By increasing the setback temperature, you can ensure that the slab will always maintain a warmer temperature. Because the heating system will not be fighting to heat a cold slab each time it turns on, heat will make its way upward into the room more quickly.
Adjust your heating schedules.
If you know that the room will take some extra time to achieve its target temperature, you can adjust your heating schedules to begin earlier than the time you would like the room to be at the target temperature. This will allow the system more time to “pre-heat” to the desired temperature.
Contact your Electrician to test your underfloor heating system.
If you have done the above steps and are still experiencing issues, contact your electrician to perform troubleshooting tests. Your electrician should check the following:
Check the thermostat’s wiring.
Remove the thermostat from the wall and ensure that the wiring into the thermostat is done correctly and securely.
Check the voltage coming into the thermostat.
While Warmup thermostat’s are all dual voltage, it is important to bring the correct voltage from the panel into the thermostat depending on the voltage of the heating cable. If there is a 120V cable in the floor, the incoming voltage should be 120V. If there is a 240V cable in the floor, the incoming voltage should be 240V. If 120V is brought in to power a 240V cable, it will decrease the wattage output of the cable, thus increasing the time it takes a room to heat to the desired temperature.
Check the heating cable’s resistance readings.
Using a digital multimeter, check the resistance of the heating cables. If the cable’s resistance is out of range, it may indicate an issue with the heating cable.
Repairing floor heating cable.
After your electrician performs the above tests, if it is determined that the heating cable is damaged, your electrician will need to perform a cable repair. Once the location of the break has been identified, follow the below video to repair the cable:
Cable repair kits can be ordered free of charge from our Warmupedia Shop.
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.
