failing on the second stage

Old 12-31-21, 12:53 PM
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failing on the second stage

Fails on second stage launch. dead stop
I have a American Standard furnace. Needed to replace the transformer. Woke up a few weeks later and was cold.
At this point It does everything according to the sequence of operation. At the point it calls for the second stage, the induce draft motor speeds up and the whole system crashes.

What Am I missing? I will look at the pressure switches, anything else? The flame is already running for 20 or so seconds, so I figure the basic controls are working and indicating a correct state.

Old 12-31-21, 01:20 PM
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What fault code are you getting ?

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