Underfloor heating problems and how to solve them

Issue: Failure of Single Zone to Heat Up or Turn Off

If one specific zone in your underfloor heating system isn't heating up as anticipated or refuses to switch off altogether, several potential problems could be causing the issue. Fortunately, many of these issues can be addressed without professional assistance.

Underfloor Heating Actuator Concerns:

Sticky Pin Valve Beneath the Actuator

Each actuator is equipped with a small pin underneath it. To troubleshoot, remove the actuator from the affected zone and ensure that the pin valve moves freely. If it appears stuck, applying a silicone spray can often remedy the situation. Alternatively, you may gently attempt to free the pin using long-nose pliers.

Complete Actuator Failure

If an actuator has ceased functioning entirely, it's likely attributed to an electrical problem, potentially related to the thermostat or wiring board. It's advisable to enlist the expertise of a qualified electrician to inspect the circuits thoroughly. A malfunctioning actuator can also result in perpetual operation of the underfloor heating system, refusing to switch off as intended.

Underfloor Heating Thermostat Issues:

Malfunctioning Thermostat or Low Battery

Resetting a thermostat can often resolve minor issues, following the instructions outlined in the user guide. In the case of wireless, battery-powered thermostats, checking and replacing the batteries may rectify the problem. If neither of these actions yields results, there might be an underlying electrical fault, necessitating the intervention of a qualified electrician. A faulty thermostat can also be responsible for keeping the underfloor heating system activated continuously.

Issue: Failure of Multiple Zones or Entire Underfloor Heating System to Heat Up

Encountering a scenario where your underfloor heating system fails to operate as expected, affecting multiple zones or the entire system, can be frustrating. Several potential causes could be responsible for this problem.

Circulation Pump Failure

The circulation pump might have ceased functioning, typically due to an electrical fault. It's advisable to seek assistance from a qualified electrician to diagnose and address this issue.

Pump Relay Malfunction on Wiring Boards

Another potential electrical problem lies with the pump relay on the wiring boards. Professional evaluation by a qualified electrician is recommended to rectify this issue.

Isolation Valves Closed on the Manifold

Ensure that the isolation valve lever aligns with the pipework on the manifold, indicating an open position. Closed isolation valves will be positioned at 90 degrees to the pipework and should be adjusted accordingly.

Stuck Blending Valve Pin

To address this concern, remove the white thermostatic valve head and inspect the pin valve for any obstructions. If the pin is stuck, applying a silicone spray may help free it. Alternatively, gently manipulating the pin with long-nose pliers can resolve the issue before reinstalling the thermostatic head.

Boiler Failure to Ignite (No Signal)

If the boiler fails to fire up, it necessitates the expertise of a qualified electrician to examine wiring board connections and relays to identify and resolve any underlying issues.

Absence of Power Supply to the Wiring Boards

Ensure that the main isolating switch supply is turned on. If it's switched off, enlist the services of a qualified electrician to restore power and investigate any potential electrical faults.

Continuous Operation of Pump or Inability to Turn Off

If you encounter this issue, it may be due to a stuck pump relay on the wiring board, requiring intervention from a qualified electrician to rectify the electrical fault.

Additionally, a faulty thermostat or low battery could contribute to this problem. Resetting the thermostat according to the user guide and inspecting the batteries in wireless, battery-powered thermostats is recommended. If issues persist, consult a qualified electrician for further evaluation.

Furthermore, a faulty or failed actuator could be the culprit, likely stemming from an electrical issue related to the thermostat or wiring board. Seek assistance from a qualified electrician to address this concern effectively.