Goodman GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower MECH-PRESSURE-SW Error Fix: Pressure Switch Failure

Error code MECH-PRESSURE-SW on the Goodman GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower means: Pressure Switch Failure. The inducer pressure switch has failed or its hose is compromised — causes 2-FLASH (stuck closed) or 3-FLASH (won't close); test with manometer to verify inducer creates proper negative pressure; check the small rubber hose between inducer housing and switch for cracks, kinks, or water blockage; the switch itself can fail mechanically with age

The most successful fix is "Test and Replace Inducer Pressure Switch" (medium difficulty, ~60 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test and Replace Inducer Pressure Switch") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Flashlight.

DIY cost: $15-$25. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Goodman GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower has 8 other known error codes, including: 10-FLASH (Incorrect Blower Speed / DIP Switch Configuration), 11-FLASH (Communication Error — ComfortNet Bus), 12-FLASH (Blower Motor Fault (ECM)), 13-FLASH (Outdoor Ambient Sensor Fault), 1-FLASH (System Lockout — Retry Limit Exceeded), and 3 more.

Error code MECH-PRESSURE-SW also appears on 2 other Goodman models: GMSS920804CN 80,000 BTU 92% AFUE Single-Stage Gas Furnace, GMVC960804CN 96% AFUE 80,000 BTU Two-Stage Gas Furnace. The fix may vary by model, so check each model's specific page for tailored repair steps.