Goodman GMSS920804CN 80,000 BTU 92% AFUE Single-Stage Gas Furnace MECH-CONDENSATE Error Fix: Condensate Drain Clogged

Error code MECH-CONDENSATE on the Goodman GMSS920804CN 80,000 BTU 92% AFUE Single-Stage Gas Furnace means: Condensate Drain Clogged. The condensate drain system is clogged — 90%+ AFUE furnaces produce significant condensate water that must drain properly; clogged drain trap, blocked hose, or failed condensate pump causes water to back up into the inducer housing, triggering pressure switch faults (3-FLASH); flush drain with vinegar or diluted bleach quarterly as preventive maintenance

The most successful fix is "Clear or Replace the Condensate Drain Trap and Pump" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$40. 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 ("Clear or Replace the Condensate Drain Trap and Pump") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Bucket, Vinegar solution.

DIY cost: $10-$40. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Goodman GMSS920804CN 80,000 BTU 92% AFUE Single-Stage Gas Furnace has 8 other known error codes, including: 10-FLASH (Incorrect Blower Speed / DIP Switch Configuration), 1-FLASH (System Lockout — Retry Limit Exceeded), 2-FLASH (Pressure Switch Stuck Closed), 3-FLASH (Pressure Switch Did Not Close), 4-FLASH (High Limit Switch Open), and 3 more.

Error code MECH-CONDENSATE also appears on 2 other Goodman models: GMVC960804CN 96% AFUE 80,000 BTU Two-Stage Gas Furnace, GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower. The fix may vary by model, so check each model's specific page for tailored repair steps.