Internal bypass rarely goes bad. More likely the high limit switches have corrosion on them and have failed. Pull the high limit switches out and see if there is corrosion on them. If there is replace both high limits and put a dab or white lithium grease on top before installing.
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Internal bypass rarely goes bad. More likely the high limit switches have corrosion on them and have failed. Pull the high limit switches out and see if there is corrosion on them. If there is replace both high limits and put a dab or white lithium grease on top before installing.