Espar problem...unique to me?

I've had my Espar bunk heater for almost 2 years and love it when it works right.... My problem is that on say mid 40 degree F nights when the heater has to cycle on and off it fails to restart.
Now I know I'm not freezing to death but after paying $1,200 to buy it installed, to me it should always work not just on cold as hell nights where it constantly runs... on the times I mention I also leave the cab windows partially down to keep the heater constantly running so it won't cycle.

Am I the only one with this problem?

I make a point to run it off of a jug of kerosene a few times a year to clean the burn chamber but don't know what else to do to get it to consistently stop and start.

 

After posting this it took 3 resets on the switch for it to finally fire up, the first attempts just resulted in a lot of smoke, a few popping noises from the exhaust then it shut off again.

Once it fires up and needs to keep running its dependable as a hammer.

I can't be the only one...

 

So the orifice is a likely culprit? Will running it on kerosene clean that or just the burn chamber?

I had bad luck with this unit from the start, the kid that installed it pointed the exhaust pipe up behind the sleeper so it filled with water choking the heater out, the burn chamber was horribly carboned up past the fins. I had a cleaned chamber installed, fixed the exhaust and it did work much better but has always had that restart problem.

I carry a spare glow pin and screen in case it fails otr, when I bought it I was running to Edmonton, Ab. weekly I always like to be ready for a problem.
If the Espar tool isn't good for the glow pin, what should I carry in case I need to change it on the road?

So on a 40 or 50 degree night when you just need a little heat will it cycle off and on all night?

 

One other thing I learned last winter is that fuzz, lint or dust that would be caught by a filter can accumulate and trigger an overheat sensor. It would start, run for a couple minutes then shutoff.
After calling a TK dealer I took the outside case off and used an airseat blower to clean off the outside and inside of the heating unit... fun thing to happen in Wyoming while the roads are closed.

 

Ok that makes a lot of sense, similar to a pilot circuit on a carbeurator to me. I can see my dust, fuzz or whatever problem contributing to that.

I really appreciate the help...thanks.