Good morning. Weil mclain ultra 80 series 2, lp, 2007 install. E 02 code, failed ignition 5 times. How does this unit detect flame or ignition? This has been an ongoing problem and very intermittent for quite some time now. Combustion chamber is very clean, replaced igniter in the past. Just replaced gas valve (installed lp orifice also) yesterday...seems worse now. Will run thru a complete cycle if or when it does fire. Again...how does sense flame? Thank you.
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