York error codes (page 2)

26 documented codes with ranked causes, repair costs, and step-by-step guidance.

York heat pump code chart (5) York furnace code chart (21)

York Furnace — 9 flashes York Furnace 9 Flashes: Reversed 115 VAC Polarity Fix York furnace 9 flashes means reversed 115 VAC polarity. Causes, safe checks, and repair costs from $0 DIY to about $250 for an electrician. York Furnace — 7 flashes York Furnace 7 Flashes: Ignition Lockout Causes & Fixes York furnace 7 flashes usually means ignition lockout after failed trials. Causes, safe checks, fixes and repair costs from $0 DIY to $1,200+.