Underfloor Heating Actuator Problems

An actuator is a component of a machine that moves and controls a mechanism or system e.g. opening a valve. When it comes to UFH, issues with actuators usually occur due to poor connection or sticky pins.

Underfloor heating actuator not working

An actuator needs an electric charge to work. If there is a wiring problem between the system and the thermostat, then an actuator can’t function; this will lead to your underfloor heating not working the way it is supposed to. Electricians will need to check the circuits and assess.

Sticky pin valve underneath an actuator

Beneath every actuator, there is a pin. If the pin is stuck then the actuator doesn’t release properly – meaning that the system may be on when it’s not meant to be, or not on when it is meant to be. Use silicone spray and a pair of pliers to free the pin.

Heat displacement

Homeowners may notice that certain parts of their UFH don’t feel like they’re releasing heat the way they are supposed to. This problem is often linked to circuits or actuator placement as a result of poor labelling at the installation stage.

If hot water is not flowing to the zone

Check the electrics, flow rates and flow temperatures as detailed above.
The zone actuator heads may be fitted to the wrong zones.

Checking connections are correct

• Turn all room thermostats down to 5 ̊C
• Check zones individually (other zones must be off)
• Turn the thermostat in the zone up high
• If another zone gets warm, it shows the actuator controlled by the thermostat is probably fitted to the wrong zone valve
• Continue to test all other zones and move actuators to their correct positions
• Re-label actuator heads