Arrived on site to inspect propane water heater not working intermittently. The error code that was present was an 8-4 flash which corresponds with a valve fault detected. We provided an estimate to perform a tune up so we could do a deep dive into the water heater. We found that the burner was a little dirty and the pilot was clean. Tested resistance of the igniter and found it was well within spec. We believe the gas valve is failing and that’s the cause of the error code. To verify, we reached out to Rheem tech support. They confirmed the code we were seeing was due to a failing gas valve. Provided estimate to replace which was accepted. Once we had the valve in hand, we turned off gas and power to the unit. We then removed the old gas valve and installed the new one. Ran gas piping back up to the union and bubble tested connections. No gas leaks present. Tested operation. Set gas valve to B which is around 140 degrees. We bled air from the faucet until it was flowing smoothly. Wa