Rheem Error Code and Repair Guides - 26 Guides
Rheem HVAC troubleshooting hub with 26 guides for fault codes, alarms, symptoms, parts checks, and repair decisions.
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".
Start With These Rheem Guides
Rheem FAQ
Where should I start with Rheem error codes?
Start with the exact Rheem model and displayed code or alarm, then open the closest guide on this page. Match the symptom, recent service history, and any secondary codes before resetting the equipment or ordering parts.
Do Rheem fault codes always mean a bad control board?
No. Many Rheem codes point to airflow, water flow, sensors, wiring, power quality, filters, switches, or operating conditions. Check the simple causes in the guide before replacing an expensive board.
When should I stop troubleshooting a Rheem fault myself?
Rheem HVAC equipment can hide unsafe ignition, refrigerant, high-voltage, or combustion problems behind a simple blinking code. Stop and use the repair checklist or compare service options when the guide points to gas, refrigerant, line voltage, sealed-system work, food-safety temperatures, or repeated faults after a reset.
| Error Code | What It Means | Guide |
|---|---|---|
| Rheem Tankless Control Board Replacement | Rheem tankless control-board guide for PCB faults, power checks, sensors, flame signal, fan wiring, and exact board matching before replacement. | Fix → |
| Rheem Water Heater Error Codes | LED, EcoNet, Tankless | Fix → |
| Rheem Water Heater Blinking Light Codes | Rheem blinking-light guide for pilot, thermopile, thermocouple, ECO switch, gas-control, and ignition faults before replacing water-heater parts. | Fix → |
| Rheem Electric Water Heater Error Codes | Rheem electric water-heater code guide for ECO trips, high-temperature cutoff, thermostat faults, heating elements, sensors, and reset limits. | Fix → |
| Rheem Furnace 5 Flashes Error Code | Flame Sensor Fault Fix | Fix → |
| Rheem RA16 Heat Pump Error Codes | Rheem RA16 heat-pump guide for flash codes, pressure trips, defrost-board faults, thermistors, capacitors, contactors, and reversing valves. | Fix → |
| Rheem Ruud Furnace Error Codes | Rheem and Ruud furnace flash and 2-digit codes for Classic, Prestige, and Endeavor units. Decode flame, pressure, limit, and blower faults. | Fix → |
| Rheem Classic Series Furnace Error Codes | Complete Guide | Fix → |
| Rheem RPH Series Packaged Unit Error Codes: Complete Guide | Use this Rheem RPH Series Packaged Unit Error Codes reference to match the code with likely causes, service checks, and repair decisions. | Fix → |
| Rheem Air Handler E1 Error Code | Causes & Fix | Fix → |
| Rheem Furnace 2 Flashes | Pressure Switch Fault | Fix → |
| Rheem Furnace 3 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace 4 Flashes Limit Fault | Rheem furnace 4-flash guide for open high-limit faults, overheating, airflow restrictions, blower issues, filters, and reset limits. | Fix → |
| Rheem Furnace 6 Flashes | Rollout Switch Open Fix | Fix → |
| Rheem Furnace 7 Flashes Error Code | Causes & Fix | Fix → |
| Rheem Furnace 8 Flashes Error Code | Ignition Lockout | Fix → |
| Rheem Furnace 9 Flashes Error Code | Reversed Polarity Fix | Fix → |
| Rheem Furnace Error Code 57 | Causes & Fix | Fix → |
| Rheem Furnace Error Code 7 Flashes | Low Flame Signal Fix | Fix → |
| Rheem Furnace Error Codes | All Flash Codes Explained | Fix → |
| Rheem Heat Pump Error Codes | Rheem RA14, RA15, and RP15 heat pump fault codes. Decode E1, E2, E4, and E5 sensor, high-pressure, and low-pressure trips. | Fix → |
| Rheem RA13 Air Conditioner Error Codes | Rheem RA13 guide for high-pressure, low-pressure, compressor overload, control-board, thermistor, anti-short-cycle, and low-voltage faults. | Fix → |
| Rheem RGPS Furnace Error Codes | Flash Code Diagnostic Guide | Fix → |
| Best Furnace Igniter Replacement: Universal and Brand-Specific Picks | Choose a furnace igniter replacement by matching style, voltage, bracket, and brand fit before ordering a universal or OEM part. | Fix → |
| Furnace Blinking 3 Times | Cross-Brand Comparison Guide | Fix → |
| How to Reset a Furnace After Lockout | Per-Brand Reset Procedures | Fix → |