OEM Carrier Fan Timer Control Board 20054502 for Model PG8HAA048075AAJA

This OEM fan timer control board (part# 20054502) is the factory-specified replacement for the Carrier PG8HAA048075AAJA gas furnace. Manufactured by Honeywell for Carrier, this board governs all critical sequencing functions — including inducer pre-purge, hot surface ignition timing, gas valve activation, blower on/off delays, and fault code diagnostics. When the board fails, common symptoms include the furnace locking out after ignition attempts, the blower running continuously or not at all, incorrect fan-on/fan-off timing, or a complete loss of heating function with no status LED activity.

• Part Number: 20054502 | Replaces: 20054501, ST9120C2010 | Manufactured by Honeywell for Carrier
• OEM vs Generic: This is a genuine OEM board built to exact factory tolerances. Aftermarket boards may lack precise timing calibration, increasing the risk of nuisance lockouts, premature component wear, and voided equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring, line-voltage blower leads, and multiple harness connectors. Always photograph all wiring before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Recommended for experienced DIYers or qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PG8HAA048075AAJA gas furnace (4-ton, 75,000 BTU, single-stage). Verify your unit's existing part number against the data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence today.