Reason 1: The switch is not really adjusted to the "hot air" position, or is not in place. Reassert.
2. The contact of the electric heating element is loose or the contact is poor. Check and weld well.
3. The heating wire is broken or burned. Check, if you disconnect a little, you can use a brass piece to connect the broken head and clamp it tightly. If the damage is serious, it should be replaced according to the original specifications.
4. There is a problem with the thermostat. Check whether the contacts of the metal sheet are sintered, if it is sticky, it can be sawed with a fine saw blade and polished smooth with No. 0 sandpaper. If the damage is serious, the bimetal sheet or thermostat of the same specification should be replaced.
