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Eberspacher Hydronic Lockout remedies?


zoltan

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Feel free to lambast me if I have posted this in the wrong forum.

I have a petrol Eberspacher Hydronic for my truck's living quarters and it won't start.

I suspect that now it has gone into lockout. I bought it from a well known auction site from a German fellow (couldn't find any petrol ones in UK) and assumed it was OK. That was several years ago and in the intervening time it has either deteriorated in storage or it was always duff. (It is a new installation to me)

I've checked the wiring harness and all appears to be correct there. I have then pulled it partially apart to enable me to check that the components all function. From this the water pump (B4WS) is not responding to 12v. I've made absolutely sure it isn't failing due to low voltage as i know Ebers commonly fail to start from LV.

At a pinch I can work it with an external electric water pump but that still won't help me with the locked out control module.

Has anyone hacked one of these?

I *could* take it go a dealer to get them to unlock it but I'm off on a trip on Friday and would quite like this thing working and a visit to a dealer really isn't in the spirit of this forum

Anyone?

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Trawled through dozens of pages on Espar.com. manuals very good but same story: it is a software lockout so it is a trip to the dealers or buy the diagnostic reset tool for £300 :(

I want a button on the side so that when it is -20 in the middle of no-where I can keep warm. Unless I can find a way to bypass/gain control of this I'm reluctant to have this in the truck. I understand the Webasto Thermo-top doesn't have this lockout feature

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IIRC Eberspacher service software is available on the web - don't know if it covers your unit though. You need a k-line interface to connect to the unit. I am told that some of the OBD - PC interfaces can do this, but I've never got as far as trying it.

I have a pcb here I designed for an Eberspacher interface, but I never got around to building it as I found the problem with my heater in the meantime. :blush:

Webasto heaters can be recovered from some kinds of lockout by removing one of the fuses. For safety reasons it only works for things like 'no start' and not for 'overheat'.

For instance...

Hardware and Software

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I bit the bullet and took my heater in to the local dealer who were extremely helpful: they ran it on the diagnostics and it hadn't locked out which was good news. No arsey attitude and did it while I waited. I have a simple water pump failure which I can replace and the fan was excessively noisy. They didn't make any charge for checking so I ordered the parts through them when I got back home. Should be here on a next day service so thanks to South Eastern Auto Electrical Services in Maidstone, cinderella will be going to the ball afterall

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