Took off cover of control board and notice the red light flashes 4 times, stops and then flashes 4 times again. What does this indicate is wrong?
Two things- Clean the sensor rods or replace(cheap and easy with YouTube instruction video) and at the same time replace the main program chip (also a easy plug in chip). The whole repair takes two hours for a homeowner and costs about 50 bucks for a chip. These are easy an generally the flame sensor rod is the culprit. The code may also be the limit switch but try EZ and cheap first. See You Tube..
https://www.youtube.com/watch?v=npxcVo7RK2c
I bought an used RTG-74PVP-2 unit for $100 with a code 29... 4 BLINKS on the RED light. I flushed the system and it worked for an hour... so, found this thread and proceeded to clean the FLAME RODS.
When I got into the unit I could clearly see the top of the burners were dirty/covered with a nasty white crystalized powder... (wear protective gear).
The overall process took about an hour. If it happens again, I'll remove the unit and clean it more thoroughly on the bench, maybe even replace the heat exchanger.
So far it's working great.
note: Anyone with the ability to responsibly turn the gas off, a long Philips X-head screwdriver, copper wire brush, and a camera... you can do this fix.
useful link: waterheatertimer.org/images/Rheem-Tankless-Parts-860.jpg
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Hi Freda Shaw, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? What is the model number?
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