Water Heater Gas Valve.

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EarthWindandFire
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Joined: Sat. Dec. 18, 2010 12:02 pm
Location: Connecticut
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Other Heating: Oil Furnace and Kerosene Heaters.

Post by EarthWindandFire » Fri. Jan. 03, 2020 3:26 pm

Happy New Year to everyone!

I have a 2 year old natural gas water heater that stopped working a few day's before Christmas. I was sure it was a bad thermopile but I called Rheem's tech-line and they recommended to replace the gas valve. Just so happens, when I first installed it I had a problem lighting it so they had sent me a replacement gas valve. Sometimes God works in mysterious ways!

My question is, based on these pictures, why does the gas valve probe look so moldy? I have the temp set fairly high, way above a temperature that should produce mold growth.

Please share your thoughts, I won't lose sleep over this but I'm curious what you guys think.

Thanks,

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Water Heater A.jpg
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Water Heater B.jpg
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McGiever
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Joined: Sun. May. 02, 2010 11:26 pm
Location: Junction of PA-OH-WV
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: PEA,NUT,STOVE /ANTHRACITE
Other Heating: Ground Source Heat Pump and some Solar

Post by McGiever » Fri. Jan. 03, 2020 11:52 pm

galvanic action
Galvanic action occurs when two electrochemically dissimilar metals are in contact and a conductive path occurs for electrons and ions to move from one metal to the other. One metal corrodes as its ions are deposited onto the other metal. ... Cathodes are noble, or stable, metals that are not prone to corrosion.

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