New Raypak LP heater issue. high limit fault

Finally changed UG. Old one looked corroded and less than $40 part. Will see if it helps.
 

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And changed the internal bypass since the new UG did not resolve problem. No high limit error today, but I will monitor going forward to see if this is the fix. Looks like the spring got stuck and rusted on the old bypass - see photo.
 

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