I have a Lennox Elite G50UH-24A-070-15. It quit entirely and threw the error "Pressure Switch open or blocked" according to the diagnostics panel on the front. Recent renos so thought it was clogged/buildup in ducting. Had them cleaned. Still throws same error. Did some research further, suggesting issue is either pressure switch or inducer motor/assembly. Had both replaced. Fired up fine immediately first thing, then next time thermostat called for heat, began throwing same error. Disconnected tubing from pressure switch to inducer while calling for heat, lost error but furnace would not ignite. Reconnected tubing and it began to ignite. Ive lost heat with same error twice since. Any ideas what would be causing this? I feel like Im at least on the right track...

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