Trane error codes
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 Heat Pump — Stuck in defrost mode Trane Heat Pump Stuck in Defrost Mode: Causes & Fixes Trane heat pump stuck in defrost? Learn the causes (defrost board, sensor, reversing valve, relay), safe checks, tech diagnosis and repair costs. Trane Heat Pump — Ice on outdoor unit Trane Heat Pump Ice on Outdoor Unit: Causes & Fixes Ice on a Trane heat pump outdoor unit: normal frost vs. problem icing, causes like low charge, defrost faults and poor drainage, safe fixes and repair costs. Trane Heat Pump — Frozen and not defrosting Trane Heat Pump Frozen, Not Defrosting: Causes & Fixes Trane heat pump iced over and not defrosting? Learn the causes (sensor, defrost board, reversing valve, low charge), safe checks, and repair costs. Trane Heat Pump — Not cooling Trane Heat Pump Not Cooling: Causes, Fixes & Costs Trane heat pump not cooling? Learn the likely causes (capacitor, contactor, refrigerant, reversing valve, frozen coil), safe checks, and repair costs. Trane Heat Pump — Not heating Trane Heat Pump Not Heating: Causes, Fixes & Costs Trane heat pump not heating? Learn the likely causes (defrost, low refrigerant, reversing valve, capacitor), safe checks, and repair costs. Trane Furnace — Runs constantly but not enough heat Trane Furnace Runs Constantly But Not Enough Heat Trane furnace runs nonstop but can't keep up? Causes from dirty filters to failing heat exchangers, DIY checks, fixes and honest US repair costs. Trane Furnace — Leaking water Trane Furnace Leaking Water: Causes, Fixes & Costs Trane furnace leaking water is usually a clogged condensate drain, bad trap, or cracked inducer. See causes, safe checks, fixes & real US costs. Trane Furnace — Pressure switch stuck open Trane Furnace Pressure Switch Stuck Open: Causes & Fixes Trane furnace pressure switch stuck open: causes from blocked vents to a failing inducer, safe checks, and repair costs from $0 DIY to $1,200. Trane Furnace — Blower not running Trane Furnace Blower Not Running: Causes & Fixes Trane furnace blower not running? Causes from door switches to bad capacitors or blower motors, DIY checks, and honest repair costs. Trane Furnace — Blower won't shut off Trane Furnace Blower Won't Shut Off: Causes & Fixes Trane furnace blower runs constantly? Causes include thermostat fan settings, a stuck limit switch or bad control board, plus fixes and repair costs. Trane Furnace — Clicking but not starting Trane Furnace Clicking But Not Starting: Causes & Fixes Trane furnace clicking but not starting? Causes include a failing ignition relay, weak transformer, or draft inducer. Fixes and costs from $0 DIY to $600. Trane Furnace — Flame sensor problems Trane Furnace Flame Sensor Problems: Causes & Fixes Trane furnace flame sensor problems cause short cycling and lockouts. Causes, safe homeowner checks, how a technician diagnoses it, and real repair costs. Trane Furnace — Ignition lockout Trane Furnace Ignition Lockout: Causes, Fixes & Cost Trane furnace ignition lockout means failed ignition after repeated tries. Causes, safe checks, fixes and costs from $0 DIY to $700 pro. Trane Furnace — Keeps shutting off Trane Furnace Keeps Shutting Off: Causes & Fixes Why your Trane furnace keeps shutting off — overheating limits, flame loss, pressure switches and dirty flame sensors — plus fixes and costs from $0 to $3,500+. Trane Furnace — Loud bang on startup Trane Furnace Loud Bang on Startup: Causes & Fixes Trane furnace makes a loud bang on startup from delayed ignition or duct flexing. Causes, safe checks, CO safety and repair costs ($0 DIY–$3,500+). Trane Furnace — Short cycling Trane Furnace Short Cycling: Causes, Fixes & Costs Trane furnace short cycling? Causes include a dirty filter, overheating limit trips, flame-sensor and control-board faults, plus fixes and US repair costs. Trane Furnace — Won't ignite Trane Furnace Won't Ignite: Causes, Fixes & Costs Trane furnace won't ignite? Common causes include a bad igniter, dirty flame sensor, or ignition lockout, plus DIY checks and repair costs. Trane Furnace — Won't turn on Trane Furnace Won't Turn On: Causes, Fixes & Costs Trane furnace won't turn on? Causes from tripped breakers to failed transformers, blower door switches & control boards, plus fixes and honest US costs. Trane Furnace — Blowing cold air Trane Furnace Blowing Cold Air: Causes, Fixes & Costs Trane furnace blowing cold air? Causes from thermostat fan settings to failed ignition, flame sensor & control board, plus fixes and honest US costs. Trane Furnace — 2 flashes Trane Furnace 2 Flashes: System Lockout Causes & Fixes Trane furnace flashing 2 means a system lockout from failed ignition retries. Learn causes, safe checks, and repair costs ($0 DIY - $1,200). Trane Furnace — 8 flashes Trane Furnace 8 Flashes: Low Flame Sense Signal Fix Trane furnace 8 flashes means a low flame sense signal from a dirty flame sensor or weak flame. Causes, fixes and repair costs explained. Trane Furnace — 9 flashes Trane Furnace 9 Flashes: Igniter Circuit Open Fixes Trane furnace 9 flashes means an open igniter circuit or no current draw. Causes, safe checks, and repair costs from $0 DIY to $250. Trane Furnace — 3 flashes Trane Furnace 3 Flashes: Pressure Switch Error Fixes Trane furnace 3 flashes means a pressure switch error. Learn causes like blocked vents, a bad inducer, and fixes plus repair costs. Trane Furnace — 4 flashes Trane Furnace 4 Flashes: Open Limit Circuit Causes & Fixes Trane furnace 4 flashes means an open temperature limit or rollout circuit. Causes, safe checks, fixes and repair costs for US homeowners.