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For the 44 code I noticed this in the troubleshooting guide
"You have excessive restriction in air delivery system. Check filter(s) and ductwork. If problem still persists, replace furnace control board. Make sure replacement board has a date code of 9506 or later. This new furnace control board will allow unit to run in high fire when necessary. See description of operation at start of Fault Code 44. If problem still persists, use Appendix E to evaluate."
From Appendix E: "If furnace is on a call for heat or cooling and duct static is too high, ICM tries to overcome external static pressure. If duct static is excessive,
ICM RPM will be out of range and a Fault Code 44 will flash on circuit board"
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Nick
Last edited by cabmandone; 01-01-2021 at 08:28 AM..
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