Apu heater not working

I have an older Airtronic heater. Can you post a picture of how that socket looks? Does this socket connect to a laptop? Do I need to have a software installed?

 

I think I have one in my service cart at my regular job. The others are at home. I’m on my way in to work now, so I’ll look as soon as I get there.
As for the socket, no, it doesn’t need to connect to anything, though you typically turn it with a small screwdriver or punch.

 

Probably so. I'm sure they pulled it out, replaced the gaskets, replaced the glow pin screen, etc.
I must've put those in my other service cart... when I worked for Public Works, they had Webasto units on some vehicles, but no Espars, and we have neither in use at the airport that I'm aware of. When I get back home, I'll grab one of my service cart I had at Navajo before they gave the axe to the part-timers in the shop and snap a photo of it.
BTW, those glow pin screens can be a bit of a MF to get out of there... those typically plug up before the glow pin craps out, and if it's not igniting, that's your likely culprit. I have a real tiny set of Snap-On pliers I use for those, but I was in Harbor Freight not too long ago, and saw something similar there.

 

Here’s the pliers I use for the glow pin screen… actually, these are the updated ones after I had to warranty the original set that I bought. I think I’ve seen something similar at Harbor Freight and I believe NAPA, as well. But these are spring loaded, so I like to do a little ventriloquist acts with them sometimes. “Hello, my name is Mr. Needlenose. Won’t you be my friend?”, and everyone else will be like, “Jeff, you’re a creepy MF…”

 

There's a plug right there at the heater itself.. make sure you have power there, as well. Off the top of my head, I don't remember which pin does what, but I have a diagram of it somewhere.

 

Here’s the glow pin socket.

 

Does Thermo King sell that tool?

 

Possibly? I got mine when I worked for Navajo… they came with each replacement glow pin. The trucks at the time had just the Espar heater, and I don’t know who the supplier was. Then they went to the Comfort Pro APUs with electric heating coils, then to the Thermo King APUs with Espar heaters.