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Same thing happened to me last year. I chased it for a while but it ended up being the ignitor. The transformer itself is in a metal box with 2 tubes that extend into the combustion housing(the high tension ignitor wires are in these tubes). At first I thought it was the noise supression circuit...

Its normal operation. There is a sensor in the front of the outlet that controls the on/off based on outlet air temp. Back when I was trying to figure this out I bypassed that sensor to see if it would just stay on like my older unit did. With the sensor disabled, it did indeed stay on and not...

Mine came with an issue from GL that I had to fix but if yours was working fine before I don't think it applies unless you dropped or hit the unit hard. In my case the heater would start and run but then once warm it would cycle off normally but then wouldn't restart. Sometimes I got the flame...

What kind of fuel is in it? Mine hates anything but clean diesel. Also, whats the fuel pressure when its running?

Did this unit work normally before or is the first time you are using it?

Perfect, thanks so much for responding. Hearing someone else has one doing the same thing makes me feel like its just the design.

Nope, does the same thing without tubes hooked up....its odd for sure.

I started using my H140 and I have noticed that it cycles often. It fires right up and then stays lit for about 3 mins, then shuts down for 1 min. Rinse and repeat. Ducts on or off makes no difference. It's not a flame out, no red light. It just shuts off fuel. My guess is the max outlet temp is...