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I recently bought a used Jandy LX Heater - it was listed cheap as "not working - air flow switch error", so I figured I scored and could put in a new-old-stock pressure switch for like $30 from ebay. Once I got it home, I discovered the problem was with the blower itself - it would just humm...

I have a Hayward H250 millivolt heater (natural gas), and the pilot won't stay lit when the button is released. Two things I noticed: 1) The thermopile seems to be putting out very little voltage - when first lit it starts around 8mv, and after 2 minutes only reaches 18mv. 2) The pilot is a...