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How to Fix Atwood Water Heater Mixing Valve 90029 Leak - Step-by-Step
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How to Fix Atwood Water Heater Mixing Valve 90029 Leak - Step-by-Step

Nobody can explain why my pressure gauge reads 150 PSI at the Atwood 90029 mixing valve when every manual says it should max out at 125 PSI. My Atwood water heater has been sitting unused for about 8 months, and now I've discovered the mixing valve (part #90029) has developed a slow drip.

I'm wondering if this is something I can fix myself or if I need to replace the whole valve? I've heard something about O-rings going bad during storage, but I'm not sure if it's worth trying to rebuild it or just bite the bullet and get a new one. Any advice on the best approach would be really appreciated! …more
Robert, RV Mechanic
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