Why Honeywell Portable air conditioner heater is not switching on?
- JJames SchmittSep 8, 2025
If the heater on your Honeywell Portable air conditioner (with built-in heating) isn't switching on, first check that the Heating function has been activated. Also, the ambient temperature may be too high; the heating function should be switched on when the ambient temperature reaches below 25°C (77°F).