OEM Carrier Fan Timer Control Board #20054502 for Model PG8HAA036075AAJA

This is the OEM factory-specified Fan Timer Control Board for the Carrier PG8HAA036075AAJA gas furnace. Manufactured by Honeywell® for Carrier®, this board governs the sequencing of the inducer motor, hot surface igniter, gas valve, and blower fan — orchestrating every stage of the heating cycle from call-for-heat to post-purge fan delay. When this board fails, common symptoms include the furnace locking out with no heat, the blower fan running continuously or not at all, erratic ignition sequences, or the unit shutting down immediately after startup. Fault codes on the LED indicator may point directly to board failure once all other components have been verified.

• Specs: 18–30V AC control voltage | Replaces OEM #20054501 and Honeywell ST9120C2010 | Fan-on / fan-off delay timing built in | Inducer, blower, gas valve, and humidifier terminal outputs
• OEM vs Generic: This is the genuine OEM Carrier/Honeywell board with factory-calibrated fan delay timings and verified terminal layouts. Aftermarket boards often have off-spec delay intervals that cause short-cycling, nuisance lockouts, or premature heat exchanger wear from incorrect fan-off timing.
• Install difficulty: 3/5 — Power down and lock out the furnace at the breaker before beginning. Tools needed: 1/4" nut driver, flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring harness connections before disconnecting. Transfer wires one at a time to the new board to avoid miswiring.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PG8HAA036075AAJA and related models in the PG8HAA, 349HAV, 349HAZ, and 58EFA furnace families. Always verify your unit's part number on the existing board or data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — reach out before you order if you have any questions.