I have an old rooftop model and I have no idea what brand it is. We have a 2 story condo with it on the roof.
First, he replaced all the wiring in the heating unit because I couldn't afford a $5000 new unit. Originally there was a small gas leak from the supply but all the wiring was really old and it looked like the unit had a fire at one time.
The unit worked after this but then after we shut the thermostat off the unit would continue to come on and off throughout the day and night.
Second, he replaced the older thermostat in the condo thinking this may be the problem. The unit still turns itself on and blows hot air even after the thermostat is off.
Third, he went back on the roof and saw that the sensor had some corrosion or gunk on it so he replaced that. Now, the heater won't come on at all.
Can anyone help us with this. I trust my mechanic but this is getting crazy.....