Why does my radiator feel cold after I change the setting?

A radiator can take time to respond after you adjust the heat setting or thermostat, especially if the room is already near the target temperature. Give it a little time, then check whether the selected setting is actually above the room temperature.

Step-by-step checks

1. Turn the thermostat up by a small amount and wait several minutes.
2. Check whether the unit is in a low setting or frost-free mode, which may not feel very warm in normal use.
3. Make sure windows and doors are shut, because open-window conditions can reduce or stop heating.
4. If the radiator has a timer or programme function, confirm that heating is meant to be active now.

What the observation means

• If heat returns when you raise the setting, the radiator was probably already close to the set temperature.
• If the unit stays cold while the controls indicate heating, stop using it and check for any unusual smells, noises or signs of damage.

When to stop using it

Stop using the radiator if it repeatedly fails to heat, overheats, trips protection too often or shows damage to the cable, plug or casing. If the issue remains unresolved or safe use is uncertain, contact the retailer or store where it was purchased.