Here goes. I have a Raypak RP1200 heater that has worked fine other than the LED (?) display was impossible to read. I decided to try racing the membrane switch decal that has a thin layer of plastic that covers the display and also has the mode button and the temperature up and down buttons. I replaced it today but when I took the heater apart, I discovered it was the display itself and not the decal.
Looking at the display, it seemed to have a thick plastic cover over it that was distorted, dirty and blackened. Here is a picture.
Using WD40 and some alcohol, I was able to get the gummy stuff off the display to the point it looked fairly clean and I was pretty optimistic that I would be able to see the display clearly. I put it all back together and turned on the switch. NOTHING!!!!! No display whatsoever!
I don't know if I wired something incorrectly or I destroyed the display trying to remove the plastic film and clean it.
I wonder if it is possible just to solder in a new display? Problem is I don't see a part number.