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Old 12-15-2019, 08:28 PM   #51
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Default Re: espar hydronic d5 controller failure mode

It's dead again! I'm waving the white flag, it was fun to troubleshoot but now I want it to work. In looking for a replacement ECU, I came across this one
https://heaters4you.com/eberspacher-...nit&results=66

Advertised for Mercedes Vito, not Sprinter, but it is a D5WZ. Anyone know if that would work? I'll do some calling around tomorrow.
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Old 12-15-2019, 08:30 PM   #52
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Default Re: espar hydronic d5 controller failure mode

Quote:
Originally Posted by markxengineering View Post
It's dead again! I'm waving the white flag, it was fun to troubleshoot but now I want it to work. In looking for a replacement ECU, I came across this one
https://heaters4you.com/eberspacher-...nit&results=66

Advertised for Mercedes Vito, not Sprinter, but it is a D5WZ. Anyone know if that would work? I'll do some calling around tomorrow.
Give 'Vanski' a call and see if he's got any left...

https://sprinter-source.com/forum/sh...ad.php?t=80666

Keith.
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Old 12-15-2019, 08:32 PM   #53
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Default Re: espar hydronic d5 controller failure mode

for reference
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Old 12-15-2019, 08:55 PM   #54
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Default Re: espar hydronic d5 controller failure mode

by the looks of all the funky schtuff all over the board
(esp the black spot under the plastic coating in the pic above)?

IMHO?

it's nuts to try fix this thing, unless spending countless hours (out in the cold) trying to fix mass-produced electronic junk is what floats yet boat?

here's how i 'fixed' mine:
https://www.ecstuning.com/b-genuine-...on/0058308061/

and with the REST modification, so can use it as an engine preheater, she's been working like a charm!

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Old 12-15-2019, 09:11 PM   #55
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Default Re: espar hydronic d5 controller failure mode

The repair effort was worth the it to me because of the learning. But that's a good price on a new one. Unfortunately the shipping date is 10 days away and I'm trying to hit the road, but I still might go for it if nothing else surfaces.
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Old 12-15-2019, 09:23 PM   #56
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Default Re: espar hydronic d5 controller failure mode

just have em ship it to one of your destinations that you'll be at for a few days.
it's a pretty easy+straight-forward R&R (an hour or so), but might want to also get some (a foot) of the exhaust hose:
http://www.lubricationspecialist.com...aust-per-foot/
couldnt get mine to let go (was welded), so just cut it off and replaced it.

and... in anticipation of the R&R on the road, you could also remove the existing unit, use an insert(barbed) connector to connect the hoses, so ya dont have to do anything but do the install, once arrive at the place where the new one will be waiting for you?
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Old 12-15-2019, 09:29 PM   #57
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Default Re: espar hydronic d5 controller failure mode

Did you verify the fan by trying to run off 6ish volts directly. It may be your brushes are wearing out and your ECU is just fine. If replacing just ECU then you may still be in the same boat.
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Old 12-15-2019, 09:42 PM   #58
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Default Re: espar hydronic d5 controller failure mode

Yes, I verified that the transistor mentioned earlier in the thread is the issue- it always gets a signal in but only sends power out the the fan some of the time. Fan was always fine when powered by a battery.
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Old 12-15-2019, 09:52 PM   #59
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Default Re: espar hydronic d5 controller failure mode

like i mentioned above, with all that 'stuff' thats all over the components on the board, any of it could be causing all sorts of 'semi-conducting' problems, on the micro electronic/integrated circuits (at 5vdc or less)?

there's no tellin whats goin on with the 'ecu'
but hey, dont take my word for it (voc-tech hs grad: industrial electronics)
40yrs + experience
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Old 12-15-2019, 10:08 PM   #60
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Default Re: espar hydronic d5 controller failure mode

Tangentially related, but doesn't the ATC just send a 12V+ "On" signal to the heater? If so, It may be worthwhile just fitting one of the chinese coolant heaters. Last I checked they are something like 300$ on the web, and should retrofit fairly easily.
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