Eberspächer Hydronic II, 12 kW

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   Hi
Onboard my H505 #072, delivered in 2015, I have installed a heater system based on the Hydronic II, circulating warm mixture of coolant and water to radiators placed in the different rooms of the boat. 
Recently the heater stopped, and I have not been able to start up again. First I thought that this was due to low diesel level, but after refueling the heater would still not start. There was no sign of life.

Today I discovered that the the accumulator tank for the circulating water mixture placed in the engine room was empty.

Can the fact that the heater is missing the circulating water mixture is the cause of the failure?

Where can the water mixture have gone? I cannot see any sign of water leakage anywhere (have not checked all corners and cavities in the boat yet).

Best regards from Bjarne

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Bjarne Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 25 June 2014 Location: Bergen, Norway Status: Offline Points: 71	Post Options Post Reply Quote Bjarne Report Post Thanks(0) Quote Reply Topic: Eberspächer Hydronic II, 12 kW Posted: 03 January 2018 at 17:25
	Hi Onboard my H505 #072, delivered in 2015, I have installed a heater system based on the Hydronic II, circulating warm mixture of coolant and water to radiators placed in the different rooms of the boat. Recently the heater stopped, and I have not been able to start up again. First I thought that this was due to low diesel level, but after refueling the heater would still not start. There was no sign of life. Today I discovered that the the accumulator tank for the circulating water mixture placed in the engine room was empty. Can the fact that the heater is missing the circulating water mixture is the cause of the failure? Where can the water mixture have gone? I cannot see any sign of water leakage anywhere (have not checked all corners and cavities in the boat yet). Best regards from Bjarne

High Time Members Profile Send Private Message Find Members Posts Add to Buddy List Vice Admiral Joined: 04 September 2012 Location: Portsmouth UK Status: Offline Points: 819	Post Options Post Reply Quote High Time Report Post Thanks(0) Quote Reply Posted: 03 January 2018 at 21:56
	The loss of the circulating water is almost certainly associated with the heater failing. There must be a leak somewhere in the system - water doesn't just disappear. Even it has escaped and then evaporated there should be traces of the antifreeze/inhibitor additive visible somewhere. You need to do a thorough search of the system to discover where the water is leaking and fix the problem (or get your original installer to do it). Once the system is watertight again fill it up and bleed the air out. Only then should you try firing the system up again. When the heater failed was it sudden i.e was it hot and just stopped, or was it cold and would not start? In either case was there a fault code displayed on the controller? Most Eberspacher units display fault codes if they fail. The fault code should give an indication of why the unit has shutdown. I am not familiar with your Hydronic II but I installed a 5KW Hydronic system on High Time driving 4 matrix fan heaters 5 years ago so have some understanding of hydronic systems. Mine has worked without problem since first installed.
	Roger High Time (415 #038)

Bjarne Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 25 June 2014 Location: Bergen, Norway Status: Offline Points: 71	Post Options Post Reply Quote Bjarne Report Post Thanks(0) Quote Reply Posted: 22 January 2018 at 10:47
	We noticed the failure when the heater wouldn't start. I did multiple start attempts before I noticed the empty tank. This has probably caused the heater to go into blocked mode. We are using the EasyStart T controller, and I do not think this display will present any failure code. At least I have not seen any. As Roger is saying, the water does not just disappear. We can see the water has drained into a canal in the lowest point in front of the engine room. However, we have not been able to locate the leakage point. We have opened all covers, dismantled furniture etc to get access to the hoses and connections. We've also used endoscope camera. We believe we have checked all connections, but have not seen any loose hose clamps or other obvious leakage points. The only trace of bleeding we have seen is from the top of the tank where the overflow hose is connected. But this might be related to our refilling of the tank. We have refilled the tank and tried to restart without any luck. The questions to you all are How do we reset the heater (if it is in blocking mode)? How do we vent the water hoses after the refilling the empty tank? Other advices or good ideas?

High Time Members Profile Send Private Message Find Members Posts Add to Buddy List Vice Admiral Joined: 04 September 2012 Location: Portsmouth UK Status: Offline Points: 819	Post Options Post Reply Quote High Time Report Post Thanks(0) Quote Reply Posted: 22 January 2018 at 11:26
	Hi Firstly the Easystart T does display error codes - at least the Manual here seems to say this (see Page 12 onwards) - but I can't confirm this as my controller is different. If you can find an error code that you don't understand then you could call the local service agent for advice as suggested on page 12. Regarding bleeding the system, there should be several bleed screws included at the highest points in the system. Firstly each radiator, or matrix heater, usually has a bleed screw included. Secondly, there will be a bleed screw on the highest point of the boiler (looking at the photo of your unit, you will probably need to remove the outer case to see it) and finally there may be one or more bleed screws in the pipework if this has any high points. My only other suggestion is to do a good Google search for Installation Manuals on your system and also a trawl on other Forums like YBW or Cruiser. Eberspacher problems are frequently reported and fixed on these Forums (Fora?). Good luck finding your leak. Edited by High Time - 22 January 2018 at 11:28
	Roger High Time (415 #038)

Bjarne Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 25 June 2014 Location: Bergen, Norway Status: Offline Points: 71	Post Options Post Reply Quote Bjarne Report Post Thanks(0) Quote Reply Posted: 29 January 2018 at 12:13
	Hi I was onboard this weekend to continue looking for a solution to my problem. I also checked the display as advised by Roger. The code displayed was "ndiA", meaning no diagnosis information available. The display might be able to display error codes given that the heater is correct and completely connected to the display. It seems that this is not the case for my system. It seems that my heater is in blocking mode, and I do not know how to solve this. The heater does not give any response as of today. Any solutions, advices regarding how to deblock? Bjarne

Wild Members Profile Send Private Message Find Members Posts Add to Buddy List Vice Admiral Joined: 18 March 2010 Location: Turkey-Greece Status: Offline Points: 937	Post Options Post Reply Quote Wild Report Post Thanks(0) Quote Reply Posted: 29 January 2018 at 17:27
	hello I have the same system with the old display not the EASYSTART. there is no diagnosis possible when the bleu-white cable is not connected between the display and the Hydronic contollerbox. blue-white cable from display EASYSTART connector B1 pin 5 to heaterconnector B2 pin 4. When you unpluged the 12 pin connector of the heater you must have 12v between pin B4 (Bleu-white cable) and pin A2 (brown cable negatif) of the connector, if not check the 5amp fuse on the 0.75mm red wire. when the heater has going several times in error ,you must clear the error memory (see manual EASYSTART) and unblock the system before restart. You need the diagnosis system connected to do this I think. I have the error keys and repair manual for the HydronicII but unfortunaly only in dutch. Edited by Wild - 29 January 2018 at 17:35
	Wild and Wet Belgium 545e#268



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