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Sauer Danfoss Controller, How do I determine if the controller is ba

Yahoo Message Number: 100216
I have a 2001 42' Affinity Affinity, Bed & Breakfast # 5972.  My engine temps used to range from the low 190s to just over 200.  Now they go from 192 and slowly climb up to 212 at the highest, then drop rather quickly to 192.  Also, the fan does NOT kick into high speed when the A/C is turned on.

Does anyone know how to determine if one of the two sensors are bad or if the A/C sensor is not working properly???  What procedure should I follow to determine if I have bad sensor/s, bad A/C signaling, or a bad controller?
 Please note that when the fan does not operate in high speed, the freon pressure on the red-hot side of the A/C compressor goes to over 300 -- 330 lbs.  When I pulled the plug on the sensor on the bottom of the horizontal pipe, the fan kicked into high gear and the freon pressure dropped down to the 250 lbs range.  I noticed this when a tech. replaced the leaking A/C hose fitting by the compressor.

Any advice would be appreciated.

My Sauer Danfoss is  # 1090411  SW Parameters  P0184203029A Thanks,  Den

Re: Sauer Danfoss Controller, How do I determine if the controller i

Reply #1 –
Yahoo Message Number: 100219
Den, I think I can help you determine if either the coolant or the charge air sensors are bad.  With a cold engine good sensors will measure nearly the same resistance across the two wires.  The way I have measured mine is to disconnect the six wire connector and, with the engine off, take resistance for each pair starting with the first two wires.  Two of the pairs should be about the same.  The third will be the trinary switch from the high side of the compressor.

The fan is not designed to run on high whenever the chassis A/C is on.  It cycles based on the compressor head pressure.  One Exception to that is that when I run with my rear A/C turned on the fan will run on high all the time.  That is an additional check you can make.

I hope your trinary is not bad as I think it is no longer available from the manufacturer of our systems.

If you decide to replace the Sauer Dafoss you'll need the 1090410 FDC which is the electronic controller only.

Good luck

George in Birmingham
'03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Sauer Danfoss Controller, How do I determine if the controller i

Reply #2 –
Yahoo Message Number: 100230
DenA simple preventive measure that has worked for me going on two years. When my controller did not kick the fan into high I removed the connectors at the controller and cleaned them with electrical contact cleaner and added some dialectic grease and it began to function correctly. I now do this every six months. My temp goes from 208 to 190 immediately when climbing under load but I have a C-9 and they run hotter. Dan 2006 Allure 31348

Re: Sauer Danfoss Controller, How do I determine if the controller i

Reply #3 –
Yahoo Message Number: 100244
Don't know if this will solve your problem but this is how we found a  bad coolant sensor in our coach. I tried attaching it to this post but  it did not work, look in the "Files" section of this group for a  document called "_Hydraulic Fan Test Procedure2.pdf". It will outline a  procedure for testing that may isolate the problem.

Dave M. 2002 Affinity,  #6103, 42' Bed & Breakfast with C12 engine #6103.
Dave & Cathy M, 2002 Affinity #6103, 2018 GMC Acadia, Linux Mint 19.2