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I see no responders to you as yet, so let’s start the ball rolling. It is always a good idea to post your coach and year, plus the make/model number of the device you are having issues with. This gives readers a little more info to respond and help.
When you say you “spray the contacts”, do you mean the relay contacts of a 12vdc control relay in the back of the water heater, which then connects 120vac to the water heater electric element (through water heater ECO and thermostat)?
If yes, then the relay contacts may be badly burned or pitted and the relay probably should be replaced. Filing (burnishing) relay contacts with very fine burnishing tools can clean contact surfaces from mild contamination, but when they are damaged badly replacement is the best solution. I would contact the manufacturer, Dometic (bought certain parts of Atwood and I think Lippert bought other divisions) to see if you can obtain a replacement part.
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