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Espar B4L Heater not starting at Elevation

37455 Views 322 Replies 60 Participants Last post by  brío
So I installed a Espar B4L in my 2020 transit, under the passenger seat and have a problem with the heater starting when I am at elevation.

I live in Boise ID, at around 3k feet elevation, when down here in the valley my heater starts 99% of the time without issues. When I travel to my local ski area around 6800K feet the heater NEVER starts first try and generally will take around 30+ minutes of trying to get the thing started. Once it does starts at elevation, it will run absolutely fine stopping and starting. When I got back down in elevation it also will always start fine, and then back up to elevation I again have the problem.

Ive completely taken apart the entire gas line from the pickup in the tank all the way to the heater, ensuring rise, fittings, etc are perfect... still have the same problem of getting it started at elevation.

Heatso has been sorta OK to work with, but I feel like they dont really know either. They will be sending me a new ECU (when they get them in a couple weeks).

Has anyone had this problem, is there a trick to getting it started I could use until i get the root cause sorted?

Appreciate any pointers!
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Are you getting any (controller or heating unit) errors? I found that if I had an error (in my case always a non-critical, nuisance type error), that error needed to be "cleared" and then I was OK to start.

I was also more likely to have one of these nuisance errors when going up to elevation and then trying to start my Espar.

Myself, also in Boise ... saw these errors when driving up to Bogus or over to Anthony Lakes, both relatively high altitude - but not THAT high. Additionally, your device should be the newer models that are adjusted to deal with high altitude.
 

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Van build and research involves so much YouTube that I bit the bullet and started paying for it. You might want to consider it. It's a tiny fraction of how much you end up spending on the van and the improvement to the quality of life is substantial.
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Whenever my espar "wont work" I have cleared the error codes and / or pulled the breaker for a full "reboot" and it has come back to life. I usually have to do this more often early in the winter ... after which it seems to work better for the remainder of the season. I'm mainly using it at 7000ft elevation for the last 3 seasons, no problems beyond what i stated above.
 
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