Easy trouble shoot test
I have a 10 year old 1st gen Coolbot and this plugged in and fixed my problem immediately. If you suspect your heater has failed (room won't go below 60 but doesn't climb above 60 either) you can check by holding your hand tight around the heater/sensor as they are installed and if after a second of warming it the a/c compressor kicks in you know it hasn't been heating.
Rating: 5 stars