How to Fix / Troubleshooting

Safety first: TRVs are battery-powered; no mains isolation is usually required, but always follow manufacturer guidance.

Check room mapping: In the Wiser app, ensure each TRV is assigned to the correct room and controller thermostat.
Reset and rebind TRVs: Remove the TRV from the app, reset it according to Drayton instructions, then re-add and assign it to the correct room.
Check valve pin: Remove the TRV head and ensure the radiator valve pin moves freely and returns under spring pressure. Free gently if stuck.
Update firmware: Use the app to update TRV firmware to the latest version.

Smart radiator thermostats (TRVs) heat when they should be off, despite room thermostat being satisfied.

Possible Causes