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Eberspacher BN4 info and help FAQ
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thomas.
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PostPosted: Tue Aug 15, 2017 6:58 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

topnotch wrote:
Hey guys, i was wondering if yo ucould help me out.

I`ve got a BN4 (pictured below) - its to go in my 68 swedish bay, but the dash switch is missing. There seems to be quite a few switches out there. 4 terminals, 6 terminals, etc etc

Do you know which one would fit? Struggling to find any in the UK at the mo! I`m also after the last piece of angled ducting which passes through the rear bulkhead under the rear seat.

Cheers, Mike

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If you just want it to work what I did was use a defroster switch. I have a timer switch but never installed it. My heater is usually on while driving in the cold months. Here's a photo of mine.

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neena
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PostPosted: Sat Feb 17, 2018 1:15 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

We fired up our recently installed BN4 and it worked great! The bus was hot as hell. Used it three times without incident, including once earlier today. Now, however, the fan kicks in, but the fuel pump doesn’t run. No problems with wires or connections. Discovered that the white 8amp fuse was blown, but after replacing it, it immediately blew again as soon as we turned the heater on.

Help! What could be causing the overheat switch to think it is overheating even though it’s not?
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PostPosted: Sat Feb 17, 2018 2:23 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

neena wrote:
We fired up our recently installed BN4 and it worked great! The bus was hot as hell. Used it three times without incident, including once earlier today. Now, however, the fan kicks in, but the fuel pump doesn’t run. No problems with wires or connections. Discovered that the white 8amp fuse was blown, but after replacing it, it immediately blew again as soon as we turned the heater on.

Help! What could be causing the overheat switch to think it is overheating even though it’s not?


Don't know if you already have this or not but it might help:
https://www.thesamba.com/vw/archives/manuals/bn4troubleshooting.php
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scrivyscriv Premium Member
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PostPosted: Sun Feb 18, 2018 4:48 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

neena wrote:
... the white 8amp fuse was blown, but after replacing it, it immediately blew again as soon as we turned the heater on.

Help! What could be causing the overheat switch to think it is overheating even though it’s not?




Pull the switch out and look at it, the contacts are probably too close. You can bend the contacts out a little to get the gap, then fine adjust the screw for the overheat cutoff temp.
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PostPosted: Sun Feb 18, 2018 8:11 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

scrivyscriv wrote:
neena wrote:
... the white 8amp fuse was blown, but after replacing it, it immediately blew again as soon as we turned the heater on.

Help! What could be causing the overheat switch to think it is overheating even though it’s not?




Pull the switch out and look at it, the contacts are probably too close. You can bend the contacts out a little to get the gap, then fine adjust the screw for the overheat cutoff temp.


Does that also mean pulling the heater? Just want to be sure before wasting an hour trying to do this with the heater in situ.
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PostPosted: Sun Feb 18, 2018 10:31 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

It was easier to get out than we thought it'd be. Here's what we've got....it's a pretty big gap....about .034" but whether that's too much or too little we don't know. Is there a factory setting? We can't find one in the manuals.

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PostPosted: Sun Feb 18, 2018 11:40 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

I may be totally off base here because I don't know jack about these flamethrowers and they've always been a mental block of mine, but I DO know what I'm doing around these electrical systems and to me an instapop fuse when power is applied means one thing- a direct short.

Since it just occurred out of the blue I'd make damn sure that a spade connector somewhere isn't touching metal- including at the switch up under the dash.

My 2c, that might be worth even less than that. Laughing

Keep us posted. It has to be something simple... the damn thing worked!
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PostPosted: Sun Feb 18, 2018 11:49 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

We made a small adjustment to the screw on the overheat switch and the heater works fine. For now. We'd feel more comfortable if we were making a factory recommended adjustment rather than a random one. If anyone has any info, don't be shy.

One of the manuals said there should be continuity between both sides of the switch. That wasn't the case with ours both with and without a fuse in place.

Also for the first time ever, the heater started up even though we'd forgotten to pull the thermostat cable lever to the open position. That's not supposed to happen right?
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PostPosted: Sun Feb 18, 2018 11:59 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

neena wrote:
Also for the first time ever, the heater started up even though we'd forgotten to pull the thermostat cable lever to the open position. That's not supposed to happen right?

It depends on how cold it is, in the summer you definitely have to pull the thermostat all the way out, in the winter not so much, sounds normal to me.
As for the blowing safety fuse?, that gap looks OK from here, never had an issue with one so I've never measured them. Bimetal springs do change with age and corrosion between the bonded layers of the metal sometimes, but Tram may be onto something since it's blowing so fast. Even if the duct was blocked it should take a minute until the switch heats enough to short itself out.
Hmmm......., whatever, it's working now so Yay!
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PostPosted: Mon Feb 19, 2018 6:57 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

busdaddy wrote:
neena wrote:
Also for the first time ever, the heater started up even though we'd forgotten to pull the thermostat cable lever to the open position. That's not supposed to happen right?

It depends on how cold it is, in the summer you definitely have to pull the thermostat all the way out, in the winter not so much, sounds normal to me.
As for the blowing safety fuse?, that gap looks OK from here, never had an issue with one so I've never measured them. Bimetal springs do change with age and corrosion between the bonded layers of the metal sometimes, but Tram may be onto something since it's blowing so fast. Even if the duct was blocked it should take a minute until the switch heats enough to short itself out.
Hmmm......., whatever, it's working now so Yay!


Yes, so far so good because it hasn’t popped a fuse over 6 more uses! But now, it’ll only run on the timer. We turn the switch to on and it doesn’t light up anymore, only when the timer is on. When the timer runs out the heater goes off. Is that a dash switch issue?
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PostPosted: Mon Feb 19, 2018 8:03 am    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

neena wrote:
busdaddy wrote:
neena wrote:
Also for the first time ever, the heater started up even though we'd forgotten to pull the thermostat cable lever to the open position. That's not supposed to happen right?

It depends on how cold it is, in the summer you definitely have to pull the thermostat all the way out, in the winter not so much, sounds normal to me.
As for the blowing safety fuse?, that gap looks OK from here, never had an issue with one so I've never measured them. Bimetal springs do change with age and corrosion between the bonded layers of the metal sometimes, but Tram may be onto something since it's blowing so fast. Even if the duct was blocked it should take a minute until the switch heats enough to short itself out.
Hmmm......., whatever, it's working now so Yay!


Yes, so far so good because it hasn’t popped a fuse over 6 more uses! But now, it’ll only run on the timer. We turn the switch to on and it doesn’t light up anymore, only when the timer is on. When the timer runs out the heater goes off. Is that a dash switch issue?

I'd suspect lack of #15 power to the switch first, is the black wire powered when the key is on?
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PostPosted: Mon Feb 19, 2018 7:23 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

busdaddy wrote:
I'd suspect lack of #15 power to the switch first, is the black wire powered when the key is on?


Just checked and there is power to the black wire when the key is turned on but turning the switch to "on" still doesn't do anything. Only the timer works. Hmmmm Think

I was really hoping for a simple solution here!
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PostPosted: Mon Feb 19, 2018 8:10 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

I have seen a few threads over the last several years with similar timer switch problems and some have been fixed by disassembling the switch for a clean and lube job. Jason has some really good detailed topics about the Eberspacher heaters, so check this link out if you haven't seen it already! Page 4 has the switch fix.

https://www.thesamba.com/vw/forum/viewtopic.php?t=614419&start=160
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PostPosted: Mon Feb 19, 2018 8:23 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

scrivyscriv wrote:
I have seen a few threads over the last several years with similar timer switch problems and some have been fixed by disassembling the switch for a clean and lube job. Jason has some really good detailed topics about the Eberspacher heaters, so check this link out if you haven't seen it already! Page 4 has the switch fix.

https://www.thesamba.com/vw/forum/viewtopic.php?t=614419&start=160


Great, thanks! We happen to have bought this switch from Jason when we took a detour to his house to load up on heater parts during a summer road trip. Of COURSE his thread has the solution! I'll check out how to clean and lube it and put that task on the list for this week.
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PostPosted: Mon Feb 19, 2018 11:34 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

If a clean and lube dont get you right, then I have switch or two I can send ya Wink After I unpack it all from moving. Rolling Eyes

What switch did I give you guys? The smaller 181 - thing type or the bigger BA6 one?
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PostPosted: Mon Feb 19, 2018 11:41 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

notchboy wrote:
If a clean and lube dont get you right, then I have switch or two I can send ya Wink After I unpack it all from moving. Rolling Eyes

What switch did I give you guys? The smaller 181 - thing type or the bigger BA6 one?


You’re my hero. I forgot that was the couple you loaded up with heater parts. It all comes together now. You are in good hands with Jason.
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PostPosted: Tue Feb 20, 2018 7:06 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

notchboy wrote:
If a clean and lube dont get you right, then I have switch or two I can send ya Wink After I unpack it all from moving. Rolling Eyes

What switch did I give you guys? The smaller 181 - thing type or the bigger BA6 one?


Hi there! Where'd you move? Seemed you had a nice thing going where you were!

The switch we got from you has a 311 part #. If you have another switch like this, let us know! A cleanup didn't work so we opened it up and it looks like this diode here has bitten the dust which is probably our problem.

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PostPosted: Tue Feb 20, 2018 8:48 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

Wow. Didnt even know I had a 311 switch. They all do the same thing but are wired different. I have some 181 ones. Or you can do this.


Ask Crofty to give you a better deal if you want it. Hes a good guy. Let me know if you want another used one or will go with this nos one.

Yes the old house was nice. But now Im single Wink Someone had to move Laughing

https://www.thesamba.com/vw/classifieds/detail.php?id=2140237
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OK, this thread is over. You win.

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PostPosted: Tue Feb 20, 2018 9:18 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

notchboy wrote:
Wow. Didnt even know I had a 311 switch. They all do the same thing but are wired different. I have some 181 ones. Or you can do this.


Ask Crofty to give you a better deal if you want it. Hes a good guy. Let me know if you want another used one or will go with this nos one.

Yes the old house was nice. But now Im single Wink Someone had to move Laughing

https://www.thesamba.com/vw/classifieds/detail.php?id=2140237


You're not "single"... you're "unique". Laughing

I think D&n got a 181 switch with the heater setup originally. I am wondering if that 181 switch might have the same diode so their 311 switch could be repaired. Too bad Radio Shaft isn't in business anymore.
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PostPosted: Tue Feb 20, 2018 11:15 pm    Post subject: Re: Eberspacher BN4 info and help FAQ Reply with quote

So yeah. The 341 stockpile is good for now. Until I decide to liberate it. I won it as part of the separation. Lets see a vert this Fall Rolling Eyes
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OK, this thread is over. You win.

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