How is underfloor heating troubleshooting done?
Floor heating is a popular heating system that provides even and pleasant heat to a room. Like any technical system, however, it can develop faults. This article explains how to troubleshoot underfloor heating and fix the most common problems.
The most common faults
Before starting repairs, it helps to identify what kind of fault you are dealing with. The most common ones are:
- Uneven heat distribution
- A leak in the heating system
- Electrical faults
- Thermostat malfunctions
1. Check the thermostat
The first step is to check the thermostat. Make sure it is switched on and set to the correct temperature. Also check that it is programmed correctly, since scheduling errors are a common cause of a floor that never seems to heat up. If the thermostat is old, faulty, or was not fixed by a settings check, it should be replaced.
2. Check fuses and electrical connections
Next, check the fuses and electrical connections. Make sure the fuses are intact and the connections are secure and undamaged. A blown fuse should be replaced; loose or corroded connections can cause the system to cut out or malfunction and should be tightened or repaired.
3. Check the heating cables
Heating cables are a key part of an electric underfloor heating system, and damage to them can prevent heat from spreading evenly. Inspect the cables visually, or use a thermal camera to spot cold or overheating spots. A damaged cable section generally needs a professional to repair or replace it.
4. Check the manifold, valves and pipes
In a water-circulation floor heating system, the manifold and valves are important components. Make sure the manifold works correctly and the valves are open. Clogged or faulty valves, or a blocked pipe, can prevent water from circulating and cause uneven heat. A blocked pipeline can usually be flushed clean; this often requires a professional's tools.
5. Check the system pressure and look for leaks
In a water-circulation system, pressure is an important indicator. Check the pressure gauge and make sure the reading is within the manufacturer's recommended range. Low or dropping pressure often points to a leak. Leaks are serious, since they can cause significant water damage, so locate the source as early as possible; a thermal camera or other specialist equipment is often needed to pinpoint it. Once the leak is found, a professional can repair it, usually by sealing or replacing the affected section of pipe.
6. Air the system
Air can build up in a water-circulation floor heating system and block water flow, which is a common cause of uneven heat. Bleed the system regularly through its air release valves to let trapped air out and keep it running efficiently.
7. Call a professional
If you cannot find or fix the fault yourself, it is best to call a professional. Underfloor heating systems are complex, and a heating technician can diagnose the problem reliably and repair it safely, especially where pipework, electrical wiring or heating cables are involved.
More background on troubleshooting underfloor heating is available from:
