Kathryn Goult Posted May 28, 2023 Share Posted May 28, 2023 Our heater, eberspacher hydronic, is not working (again). This time the fault code is 39. Vehicle fan relay control short circuit. My partner has checked and rechecked the wiring. The heater starts and stops after 2 mins. Can any one help please? Link to comment Share on other sites More sharing options...
Keithl Posted May 28, 2023 Share Posted May 28, 2023 Not knowing your exact system layout I'm assuming you have a circulation pump on some kind? If so a common cause of shutting down after a minute or so is the circulation pump not working and the heater doing an overtemp shutdown. Possibly worth checking as fault codes sometimes do not reflect reality. Boat yards are a good place to try and get Eberspacher heaters repaired as they are often fitted to canal boats and the like. Link to comment Share on other sites More sharing options...
david lloyd Posted May 28, 2023 Share Posted May 28, 2023 Kathryn, I posted a similar problem on a thread a couple of months ago as the Eberspacher Combitronic on our 2006 Pioneer Renoir kept failing to start up and run on diesel. Had it to an Eberspacher service agent (an auto electrician) to pinpoint the problem which turned out to be low leisure battery voltage - these heaters take quite a bit to start. Had the leisure batteries changed and that sorted the problem. As a matter of interest, looking back through the service history a similar problem with the heater had been evident in 2012 - the solution then? Two new leisure batteries and I think they were the ones I just replaced! David Link to comment Share on other sites More sharing options...
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