Diagnosis
That’s the fan blowing room air over heating elements that aren’t actually hot. On this model, the most common culprit is a failed or tripped thermal cutoff fuse, which is a safety part that can blow if the heater overheats.
How to Fix It
Unplug the heater and let it cool completely. You’ll need to open the case to check the fuse. 1) Flip the heater over and remove the four screws on the bottom plate. 2) Carefully lift the outer shell off. 3) Locate the ceramic heating element assembly. You’ll see a small, rectangular fuse (usually white or beige) clipped or soldered to one of the metal heater brackets. 4) Use a multimeter to test it for continuity. If it shows no continuity, it’s blown. You can find an exact replacement by searching for the part number printed on the old fuse. 5) Solder or securely clip in the new fuse, reassemble the unit, and test it.
If That Didn't Work
If the fuse is fine, the ceramic heating element itself might have failed. You can test it for continuity as well. A lack of continuity means the element is dead and the whole heater assembly needs replacing, which often isn’t cost-effective.
Heads Up
That fuse trips for a reason—usually blocked air vents or the heater being placed too close to a wall or curtains. Before you run it again, make sure it’s on a hard, flat surface with at least three feet of clearance on all sides, especially the front grille and rear vents.