I have a Max E Therm SR333NA heater that is only about four years old but hasn't been fired up in over two years. Due to the cool summer, I want to use and can't get the unit to fire up.
The heater will ignite, burn for five seconds,release a short puff of light smoke, shut down and continue through that sequence until I turn it off the heater. No diagnostic lights on the Fenwall light.
Any tips out there?