Trane error codes (page 2)

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

Trane heat pump code chart (5) Trane furnace code chart (23)

Trane Furnace — 5 flashes Trane Furnace 5 Flashes: Flame Sensed Without Gas Trane furnace 5 flashes means flame detected with the gas valve off. Causes, safe checks, technician diagnosis and repair costs from $0 to $600. Trane Furnace — 6 flashes Trane Furnace 6 Flashes: Reversed Polarity & Grounding Trane furnace 6 flashes means reversed 115 VAC polarity or poor grounding. Causes, safe homeowner checks, and real US repair costs for this pro-only fix. Trane Furnace — 7 flashes Trane Furnace 7 Flashes: Gas Valve Circuit Error Fixes Trane furnace 7 flashes means a gas valve circuit error. Learn the causes, safe checks, and repair costs — commonly $150–$1,200+ for a pro fix. Trane Furnace — Code 90 (2 blinks) Trane Furnace Code 90 (2 Blinks): Causes & Costs Trane or American Standard furnace flashing code 90 / 2 blinks? What this inducer and pressure-switch fault family means, safe checks, and repair costs.