Rheem error codes
19 documented codes with ranked causes, repair costs, and step-by-step guidance.
Rheem heat pump code chart (6) Rheem furnace code chart (13)
Rheem Heat Pump — Ice on outdoor unit Rheem Heat Pump Ice on Outdoor Unit: Causes & Fixes Ice on a Rheem heat pump outdoor unit: normal frost vs. a real problem, the main causes (airflow, drainage, low charge), safe fixes and repair costs. Rheem Heat Pump — Stuck in defrost mode Rheem Heat Pump Stuck in Defrost Mode: Causes & Fixes Rheem heat pump stuck in defrost? Learn the likely causes (defrost board, coil sensor, reversing valve), safe checks, and repair costs from $0 to $2,500. Rheem Heat Pump — Not cooling Rheem Heat Pump Not Cooling: Causes, Fixes & Costs Rheem heat pump not cooling? Learn the likely causes (capacitor, contactor, refrigerant, reversing valve), safe checks and honest US repair costs. Rheem Heat Pump — Not heating Rheem Heat Pump Not Heating: Causes, Fixes & Costs Rheem heat pump not heating? Ranked causes from thermostat settings to reversing valves and low refrigerant, safe checks, and repair costs from $0 to $2,500+. Rheem Heat Pump — Frozen and not defrosting Rheem Heat Pump Frozen, Not Defrosting: Causes & Fixes Rheem heat pump iced up and not defrosting? Learn the causes (defrost board, sensor, airflow, low charge), safe checks, and repair costs from $0 to $1,500+. Rheem Furnace — Clicking but not starting Rheem Furnace Clicking But Not Starting: Causes & Fixes Rheem furnace clicking but not starting? Causes include a bad igniter, relay, inducer, control board or transformer. Fixes and costs: $0 DIY to $1,200+. Rheem Furnace — Leaking water Rheem Furnace Leaking Water: Causes, Fixes & Costs Why a Rheem furnace leaks water: clogged condensate drain, failed pump, AC coil pan, venting issues. Safe checks, pro fixes, and costs from $0 to $2,500+. Rheem Furnace — Pressure switch stuck open Rheem Furnace Pressure Switch Stuck Open: Causes & Fixes Rheem furnace pressure switch stuck open: blocked vents, condensate, or a weak inducer, safe checks, and repair costs from $0 to $1,200 or more. Rheem Furnace — Runs constantly but not enough heat Rheem Furnace Runs Constantly, Not Enough Heat: Fixes Rheem furnace runs nonstop but the house stays cool? Learn the likely causes, safe homeowner checks, what a tech will test, and typical repair costs. Rheem Furnace — Blower not running Rheem Furnace Blower Not Running: Causes & Fixes Rheem furnace blower not running? Causes include door switch, board fuse, blower capacitor, motor and control board — plus safe DIY checks and repair costs. Rheem Furnace — Blowing cold air Rheem Furnace Blowing Cold Air: Causes & Fixes Rheem furnace blowing cold air? Common causes like thermostat fan settings, flame sensor failure or limit lockout, plus fixes and repair costs. Rheem Furnace — Flame sensor problems Rheem Furnace Flame Sensor Problems: Causes & Fixes Rheem furnace flame sensor problems cause short cycling and lockouts. Common causes, safe homeowner checks, pro cleaning and typical costs of $80–$250. Rheem Furnace — Ignition lockout Rheem Furnace Ignition Lockout: Causes, Fixes & Costs Rheem furnace ignition lockout means failed trial-for-ignition after multiple tries. Causes, safe checks, and $0 DIY to about $1,550 repair costs. Rheem Furnace — Keeps shutting off Rheem Furnace Keeps Shutting Off: Causes & Fixes Rheem furnace keeps shutting off? Common causes include overheating, flame sensor, pressure switch and limit faults — fixes and costs from $0 to $3,500+. Rheem Furnace — Loud bang on startup Rheem Furnace Loud Bang on Startup: Causes & Fixes Rheem furnace loud bang on startup usually means delayed ignition or expanding ductwork. Causes, fixes and costs from $0 DIY to $900. Rheem Furnace — Short cycling Rheem Furnace Short Cycling: Causes, Fixes & Costs Rheem furnace short cycling? Causes include dirty filters, overheating limits, oversizing and flame-sensor faults — fixes and costs from $0 to $1,800. Rheem Furnace — Won't turn on Rheem Furnace Won't Turn On: Causes, Fixes & Costs Rheem furnace won't turn on? Causes from tripped breakers to failed boards, safe checks you can do, plus honest US repair costs. Rheem Furnace — Won't ignite Rheem Furnace Won't Ignite: Causes, Fixes & Costs Rheem furnace won't ignite? Common causes include a failed hot surface igniter, dirty flame sensor, or ignition lockout — fixes cost $0–$1,200. Rheem Heat Pump — Flashing fault light Rheem Heat Pump Flashing Light: Causes & Fixes Rheem heat pump flashing fault light on the defrost board? What the blink codes mean, causes ranked by likelihood, safe checks, and repair costs.