Rheem Error Code Reference — All 58 Codes
Complete Rheem error code cheat sheet. All 58 fault codes with plain-English explanations and direct links to fix guides.
Use this page when your Rheem furnace, air conditioner, heat pump, or mini split is flashing a fault. Start with the exact code, then open the fix guide to diagnose airflow, ignition, sensor, pressure switch, board, or communication problems before you order parts or book a service call.
Tip: search the exact brand, model, and code together, for example "Rheem error code 13" or "Rheem pressure switch fault".
| Error Code | What It Means | Guide |
|---|---|---|
| Best Furnace Igniter Replacement | Universal and Brand-Specific Picks | Fix → |
| Rheem A01 Error Code | Causes & Fix | Fix → |
| Rheem Air Handler E1 Error Code | Causes & Fix | Fix → |
| Rheem Classic Series Furnace Error Codes | Complete Guide | Fix → |
| Rheem EcoNet A101 Error Code | Causes & Fix | Fix → |
| Rheem Furnace 2 Flashes | Causes & Fix | Fix → |
| Rheem Furnace 2 Flashes | Pressure Switch Fault | Fix → |
| Rheem Furnace 3 Flashes | Causes & Fix | Fix → |
| Rheem Furnace 3 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace 4 Flashes | Causes & Fix | Fix → |
| Rheem Furnace 4 Flashes | Open High Temperature Limit Fix | Fix → |
| Rheem Furnace 5 Flashes Error Code | Flame Sensor Fault Fix | Fix → |
| Rheem Furnace 6 Flashes | Rollout Switch Open Fix | Fix → |
| Rheem Furnace 7 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace 7 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace 8 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace 9 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace Blower Won't Shut Off | Causes & Fix | Fix → |
| Rheem Furnace Blowing Cold Air | Causes & Fix | Fix → |
| Rheem Furnace Error Code 57 | Causes & Fix | Fix → |
| Rheem Furnace Error Codes | All Flash Codes Explained | Fix → |
| Rheem Furnace Igniter Not Working | Causes & Fix | Fix → |
| Rheem Furnace Not Heating | Causes & Fix | Fix → |
| Rheem Furnace Won't Turn On | Causes & Fix | Fix → |
| Rheem Performance Platinum PDN Tankless Error Codes | Complete Fix Guide | Fix → |
| Rheem R96V Furnace Problems & Error Codes | Most R96V failures trace to pressure switch faults (codes 45/46/57) from blocked venting or plugged condensate traps, not failed boards. | Fix → |
| Rheem RA13 Air Conditioner Error Codes | Fault Code Diagnostic Guide | Fix → |
| Rheem RA16 Heat Pump Error Codes | Flash Code Diagnostic Guide | Fix → |
| Rheem RGPS Furnace Error Codes | Flash Code Diagnostic Guide | Fix → |
| Rheem RPH Series Packaged Unit Error Codes: Complete Guide | Rheem RPH packaged heat pump error codes and fault diagnostics. Flash codes, fault descriptions, and step-by-step technician fixes. | Fix → |
| Rheem RTGH-95DVLN Problems & Error Codes | Code 11 ignition failure is most common, usually caused by gas supply interruption, flame rod fouling, or igniter failure requiring cleaning or part replacement. | Fix → |
| Rheem Split System Heat Pump Error Codes | RA14, RA15, RP15 Fault Guide | Fix → |
| Rheem Tankless Error Code 12 | Causes & Fix | Fix → |
| Rheem Tankless Water Heater Control Board Replacement Guide | Persistent error codes, ignition failures, no heating, or unresponsive controls mean your PCB is faulty. Replacing the control board restores normal operation after you rule out sensors and wiring. | Fix → |
| Rheem Tankless Water Heater Error 76 | Causes & Fix | Fix → |
| Rheem Tankless Water Heater Flame Sensor Replacement Guide | Flame proving errors, unit won't ignite, shuts off mid-cycle, or carbon buildup on rod? Replacing the flame sensor fixes detection faults. | Fix → |
| Rheem Tankless Water Heater Flow Sensor Replacement Guide | Error code 24, no hot water ignition, or intermittent shutdown point to flow sensor failure. Replacing the flow meter restores proper operation. | Fix → |
| Rheem Tankless Water Heater Secondary Heat Exchanger Replacement | Low outlet temp, error 29, water leaks, poor hot water flow, and visible corrosion mean your secondary heat exchanger has failed. Replacing it restores proper heating and clears the fault. | Fix → |
| Rheem Water Heater Anode Rod Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Blinking Light Codes | What Each Flash Means and How to Fix It | Fix → |
| Rheem Water Heater Dip Tube Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Drain Valve Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Error Codes | Complete Guide | Fix → |
| Rheem Water Heater Gas Control Valve Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Heating Element Replacement | Signs & How-To | Fix → |
| Rheem Water Heater High-Limit Switch / ECO Replacement Guide | Heater won't run after lockout, power cycle doesn't clear fault, or ECO trips repeatedly. Replacing the upper thermostat / ECO assembly restores operation. | Fix → |
| Rheem Water Heater Leaking | Causes & Fix | Fix → |
| Rheem Water Heater No Hot Water | Causes & Fix | Fix → |
| Rheem Water Heater No Ignition | Causes & Fix | Fix → |
| Rheem Water Heater Not Enough Hot Water | Causes & Fix | Fix → |
| Rheem Water Heater Pilot & Burner Assembly Replacement Guide | Pilot won't stay lit, weak flame, burner won't ignite, or sooting? Replacing the Rheem pilot assembly or burner assembly fixes failed flame proving and gas delivery issues. | Fix → |
| Rheem Water Heater T&P Relief Valve Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Thermocouple Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Thermostat Replacement | Signs & How-To | Fix → |
| Rheem Water Heater Water Too Hot | Causes & Fix | Fix → |
| Rheem XE40M06ST45U1 Water Heater Problems & Error Codes | Most XE40M06ST45U1 units lose hot water from a tripped ECO or failed heating element. Reset the high-limit switch or test and replace the faulty element. | Fix → |
| Rheem XE40T06ST45U1 Water Heater Problems & Error Codes | Most common: red 4-blink code from tripped ECO or loose element wiring. Reset the high-limit switch and check element terminals for damage. | Fix → |
| Rheem XE50T10HS45U1 Problems & Error Codes | Wet rope sensor triggers false leak alarms on this 50-gallon ProTerra heat pump. Disconnect sensor from board, dry it, replace if needed. | Fix → |