First time firing it up this spring, pilot light has been lit but nothing happens when I turn it on. The thermostat was replaced last year and the gas valve was replaced probably 3-4 years ago. Any ideas why it won't start?
Is the filter clean? Clean the cartridges for a cartridge filter or give the system a backwash and rinse if it’s a sand filter. Also remove the pressure sensor and check to see that water comes out of the copper tube when water is circulating to prove their is not blockage
It's possible there is a blockage in one of the lines---those tubes are a very popular place for spiders to build a nest. check especially where you see curves in any of the tubes
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