anestg
Starts then stops with flashing LED indicating low coolant level.
Shorting with a paper clip across the wiring harness plug deletes the flashing LED and the generator operates as it should. 
At this point it would be easy to conclude that P/N 0E2507 (Probe coolant Level 3/8NPTF) needs to be replaced.  

On parts list for "cooling system 1.6L C1" there are two probes.   The second being P/N 0H1827.  This second probe has a condition of use stated as "(USE WITH I/N 40, P/N 0H1851).  

Does anyone know the specs of these two probes (as in resistance and what the "USE WITH" conditions mean)?  Or more simply - will they both work?

There is also a kit listed - P/N 0G0725A The kit appears to contain other components but offers no explanation as to what is included.
Any experience as to the best way to sort all this out will be much appreciated.
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Wireform
Call the Ziller store for parts purchase and clarification. They are the ones that host this site so they do deserve the business too. 
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anestg
I'm in agreement with your suggestion, but you are a bit late and failed to provide the info I need.
I called the Ziller store and ask for clarification.  They said to post my questions on the forum because "there are some really smart people on the forum.  They will help you"
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Geoff Z
Just confirming you received the shopping cart I sent you with the correct probe?
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anestg
Thanks Geoff - sorry - did not know it was you on the forum.  I responded to the shopping cart - will call you tomorrow to discuss details.
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Peddler
A flashing led has a different meaning then a solid one.  On the road without my books and I'm not sure which controller this is but it may not be what you think.
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cookelec
Flashing indicates low coolant level based on your model number.(serial number missing a digit)
The unit you are talking about should have an R-200 series board.The 0E2507 probe has been replaced with the 0H1827 probe but the sensor interface module has to be changed to an 0H1851.
These parts would be supplied in kit 0H50540SRV. Best if we knew exact serial number.
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Geoff Z
SN 4811755. You are correct an R-200 controller. I did also come up with 0H50540SRV. I confirmed with parts. Thank you for your description. That explains why it comes with a harness.

https://www.zillerelectric.com/products/generac-0h50540srv-coolant-level-sensor-probe-upfit-kit-r-panels
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