Symptom: Heater Does Not Turn Off
Possible Cause(s):
- Unit is undersized for the room;
- Room is extremely poorly insulated and heat loss from leaky doors and windows or poor wall / ceiling insulation is exceeding unit's ability to heat the space.
Possible Repair(s):
- Stop excessive air infiltration into room by weatherstripping doors and windows;
- Insulate walls if they are exterior walls having no insulation;
- Add additional heater(s) as required. See How to Size an Electric Room Heater
