Space heater not heating

Symptoms

• Fan blows air but it's not warm
• Only cool or room-temperature air comes out
• Was heating fine recently and then stopped
• Display shows normal operation but no warmth

Likely causes

• CommonUnit set to fan-only mode by mistakeMany heaters have a fan-only setting that circulates air without heating it.
• CommonFailed heating elementThe most common reason a heater blows air but never gets warm.
• PossibleTip-over or overheat switch stuck in the tripped positionA stuck safety switch can prevent the heating element from ever engaging, even though the fan runs.
• PossibleThermostat set below room temperatureIf the target temperature is already below the current room temperature, the element won't turn on.
• Less commonFailed thermal fuseA safety fuse that blew from a past overheating event and cut power to the element permanently.

What to do

1. Check the mode setting and switch it to heat rather than fan-only.
2. Raise the thermostat setting well above the current room temperature to force the element to engage.
3. Make sure the unit sits flat, level, and undisturbed, since a tripped tip-over switch can silently block the heating element while the fan still runs.
4. Let the unit cool fully, unplug it for a few minutes, then plug back in and retest.
5. Listen and feel near the vents for any warmth building at all in the first minute, since some elements take a short time to heat up.
6. If the fan runs consistently with zero warmth after these checks, the heating element or an internal fuse has likely failed.

Tools and parts

• None

When to call a pro

Replacement is almost always more practical than repairing a failed heating element or internal fuse on a consumer space heater.

Safety