This can be caused by a faulty thermostat or zone value or damaged
If you underfloor heating system is not reaching temperature this may be due to downward heat loss. If your heating system has been installed on an un-insulated concrete slab or over an unheated space and insulation boards were not used, there will be a considerable amount of heat loss into the sub floor.
Change the furnace filter on a regular basis to prevent airflow problems. Closed or obstructed vents can also cause it to feel like the furnace isn't making enough heat, because not all of its hot air makes it through the vents into your living areas. Check all vents to make sure louvers are open.
The heat output of an underfloor heating system can be significantly increased by installing high-quality UFH floor insulation alongside your system. Insulation improves a system's performance, improving heat-up times and ensuring the heat produced by the system will not escape the space.
The radiant floor system takes much longer to respond to air temperature changes. So if the convective heat source took over and shut off the radiant system, then the convective heat crapped out...the woodstove burning down...it would take some time for the radiant floor to begin heating up again.
This can be caused by a faulty thermostat or zone value or damaged heating cables or mats. The culprit could also be tripped circuit breakers, where your electrical box is tripped by faulty or broken wiring, or over-consumption of electricity.
Heat Loss
Heat loss can dramatically affect how long your underfloor heating system takes to warm up. Minimising heat loss through proper insulation where heat is most likely to escape is key —like windows, doors, and walls.
This is typically somewhere between 21°C and 27°C. You should also take into account how many people in your household might use a particular room regularly and for what purpose. As a general rule, it is recommended you set your underfloor heating manifold to within a temperature range of 35°C - 45°C.
Radiators might not be getting hot due to trapped air requiring bleeding, a malfunctioning boiler or central heating pump, thermostatic radiator valves that might be stuck or set too low, or the central heating system having sludge or rust which causes blockages.
Some of the most common thermostat issues include:
The thermostat is broken, not properly level, or dusty. The thermostat needs to be recalibrated. There is loose wiring causing a thermostat issue.
This problem often points to inadequate circulation of warm air. It could be due to blocked vents, a failing HVAC fan, or issues with the furnace itself. Ensure that furniture or drapes are not blocking your vents.
Underfloor heating not working could be a result of air in your pipes. It is common for air to get trapped within your piping, which can cause reduced flow and patches of the floor which aren't as warm, ultimately decreasing the system's heat output.
If this is the first time you've had underfloor heating, you may wonder why your floor doesn't feel hot. Don't panic, your floor won't feel anywhere near as hot as traditional radiator but that doesn't mean it isn't heating your room.
Radiant Heat Systems
Since these systems radiate heat more gradually, they often perform best at slightly lower temperatures. Setting your thermostat to around 65°F during the day and reducing it by 5-10°F at night can optimize energy use without sacrificing comfort.
However, for underfloor heating, the heat output can be significantly increased by insulating the area directly beneath the underfloor heating system. To keep running costs and heat output to a minimum, insulation offers the best possible solution.
Basically, your home will heat up to a comfortable temperature faster. So, whilst it won't necessarily be cheaper to leave your underfloor heating on for a sustained period initially, it could lead to long-term savings.
If your underfloor heating is not heating up and there is no sign of life on the thermostat then you need to check the electrical supply. One of the most common reasons for electric underfloor heating not working is that somebody has switched off the fused spur that supplies the underfloor heating with power!
While it's true that underfloor heating does not produce as much heat as a conventional radiator, it does generate enough heat to create a comfortable environment. The system works to evenly distribute heat over the entire floor surface, so the room temperature can reach up to 25°C.
Most modern thermostats will have a clearly marked reset button inside the panel. It's usually small and recessed, so you might need a pointed object like a paperclip to press it. For those wondering specifically how to reset air conditioner thermostat models, the process is generally the same.
Heat loss in the subfloor or the space below causes floors to heat up more slowly. A slower heating time takes longer to reach the target temperature. This is due to your heating system being installed over a concrete slab or an unheated space without insulation boards.
You can rest assured that leaving an underfloor heating system on all day long without causing any unwanted problems or damage to the system.
Most radiant floor heat systems take about a day to come up to full temperature. The reason for this is due to how the radiant heating system stores energy. Before a radiant floor can emit energy (heat) into a space, it first has to raise the floor temperature.