Quote:
Originally Posted by bspiek
What control boards are recommended? My furnace lights but doesn’t recognize the flame. I’ve done all of the cleaning and polishing like I do on a normal house furnace but none have worked.
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You can download the Troubleshooting Guide here:
http://bryantrv.com/docs2/docs/subsw.pdf
Page 14 has the LPG ignition sequence listed in full. The "section of ignition sequence" they omitted is the "flame sensor voltage". If the components (thermostat/limit/ECO switch, gas valve, ignitor/electrode and control board) are all working properly, the burner will ignite.
Cleaning a faulty flame sensor might cause it to work but also may not.
The entire process is dependent on having 12VDC at the control board connection and that there is no corrosion on any of the connections on the water heater. I've had several through the years that had corrosion on the thermostat/limit switch "blade plug connection" (under the black plastic cover) and others with corrosion on the electrical connectors on the gas valve and/or on the connectors on the control board on the back of the water heater.
Take a look at the ignitor/electrode assembly. It's also the flame sensor and produces a "microvoltage" that feeds back to the control board to confirm ignition and flame. If it doesn't sense a flame and send that voltage to the control board, the system will shut down.
From what you're saying, it sounds like the water heater is igniting, but then shutting down after a flame starts. It may be the electrode, the wiring back to the control board/gas valve or it could be a bad control board. I'd suspect it's likely to be "in the front part of the water heater where things stay wet and rusty" rather than the control board.
That said, if I were to buy a replacement board, I'd buy Dinosaur Electronics brand. They seem to be much more "robust and reliable" than OEM boards.