Furnace condensate drain pipe is broken at the neutralizer
A broken PVC joint at the condensate neutralizer is a repair, and the furnace stays. Look at the break. A clean white socket means the glued joint pulled apart, and a jagged edge means the elbow snapped from heat and age. Both get cut back and reglued with a new fitting in about two hours. If the furnace also locks out during ignition, the condensate has nowhere to go, and the drain repair is what clears the lockout.
Read the full guide
Ready to hire? See where Runhome sends vetted pros for furnace and heating work.