| 1 | Rheem HVAC Error Code 1: How to Fix It | medium | Easy |
| 1 Flash | Rheem HVAC 1 Flash Error Code: How to Fix It | low | Easy |
| 10 | Rheem HVAC Error Code 10: How to Fix It | medium | Medium |
| 10 Flash | Rheem HVAC Error Code 10 Flash: How to Fix It | high | Hard |
| 11 | Rheem HVAC Error Code 11: How to Fix It | high | Medium |
| 11 | Rheem Water Heater Error Code 11: How to Fix It | critical | Medium |
| 12 | Rheem HVAC Error Code 12: How to Fix It | critical | Hard |
| 12 | Rheem Water Heater Error Code 12: How to Fix It | critical | Medium |
| 13 | Rheem HVAC Error Code 13: How to Fix It | high | Medium |
| 13 | Rheem Water Heater Error Code 13: How to Fix It | critical | Hard |
| 14 | Rheem Water Heater Error Code 14: How to Fix It | critical | Medium |
| 14 | Rheem HVAC Error Code 14: How to Fix It | medium | Medium |
| 15 | Rheem Water Heater Error Code 15: How to Fix It | critical | Hard |
| 15 | Rheem HVAC Error Code 15: How to Fix It | medium | Medium |
| 16 | Rheem HVAC Error Code 16: How to Fix It | medium | Medium |
| 17 | Rheem HVAC Error Code 17: How to Fix It | medium | Hard |
| 18 | Rheem HVAC Error Code 18: How to Fix It | medium | Medium |
| 19 | Rheem Water Heater Error Code 19: How to Fix It | high | Hard |
| 19 | Rheem HVAC Error Code 19: How to Fix It | medium | Medium |
| 2 | Rheem HVAC Error Code 2: How to Fix It | medium | Hard |
| 2 Flash | Rheem HVAC Error Code 2 Flash: How to Fix It | high | Medium |
| 20 | Rheem HVAC Error Code 20: How to Fix It | medium | Medium |
| 21 | Rheem HVAC Error Code 21: How to Fix It | high | Medium |
| 21 | Rheem Water Heater Error Code 21: How to Fix It | high | Medium |
| 22 | Rheem HVAC Error Code 22: How to Fix It | high | Medium |
| 23 | Rheem HVAC Error Code 23: How to Fix It | medium | Medium |
| 24 | Rheem Water Heater Error Code 24: How to Fix It | high | Hard |
| 24 | Rheem HVAC Error Code 24: How to Fix It | medium | Medium |
| 25 | Rheem HVAC Error Code 25: How to Fix It | medium | Medium |
| 26 | Rheem HVAC Error Code 26: How to Fix It | medium | Medium |
| 27 | Rheem HVAC Error Code 27: How to Fix It | medium | Medium |
| 28 | Rheem HVAC Error Code 28: How to Fix It | medium | Medium |
| 29 | Rheem Water Heater Error Code 29: How to Fix It | high | Medium |
| 29 | Rheem HVAC Error Code 29: How to Fix It | medium | Medium |
| 3 | Rheem HVAC Error Code 3: How to Fix It | high | Medium |
| 3 Flash | Rheem HVAC Error Code 3 Flash: How to Fix It | critical | Medium |
| 30 | Rheem HVAC Error Code 30: How to Fix It | medium | Medium |
| 31 | Rheem HVAC Error Code 31: How to Fix It | high | Medium |
| 31 | Rheem Water Heater Error Code 31: How to Fix It | medium | Medium |
| 32 | Rheem HVAC Error Code 32: How to Fix It | high | Medium |
| 32 | Rheem Water Heater Error Code 32: How to Fix It | medium | Medium |
| 33 | Rheem HVAC Error Code 33: How to Fix It | critical | Medium |
| 4 | Rheem HVAC Error Code 4: How to Fix It | high | Medium |
| 4 Flash | Rheem HVAC Error Code 4 Flash: How to Fix It | critical | Hard |
| 41 | Rheem HVAC Error Code 41: How to Fix It | high | Hard |
| 42 | Rheem HVAC Error Code 42: How to Fix It | high | Hard |
| 43 | Rheem HVAC Error Code 43: How to Fix It | high | Medium |
| 5 | Rheem HVAC Error Code 5: How to Fix a Weak Flame Sensor | medium | Easy |
| 5 Flash | Rheem HVAC Error Code 5 Flash: How to Fix It | critical | Medium |
| 57 | Rheem HVAC Error Code 57: How to Fix It | medium | Medium |
| 6 | Rheem HVAC Error Code 6: How to Fix It | medium | Medium |
| 6 Flash | Rheem HVAC Error Code 6 Flash: How to Fix It | medium | Medium |
| 61 | Rheem HVAC Error Code 61: How to Fix It | high | Medium |
| 61 | Rheem Water Heater Error Code 61: How to Fix It | high | Medium |
| 62 | Rheem HVAC Error Code 62: How to Fix It | high | Medium |
| 63 | Rheem HVAC Error Code 63: How to Fix It | high | Medium |
| 65 | Rheem Water Heater Error Code 65: How to Fix It | high | Medium |
| 7 | Rheem HVAC Error Code 7: How to Fix Fan Limit Fault | medium | Medium |
| 7 Flash | Rheem HVAC Error Code 7 Flash: How to Fix It | high | Hard |
| 71 | Rheem HVAC Error Code 71: How to Fix It | high | Medium |
| 72 | Rheem HVAC Error Code 72: How to Fix It | high | Hard |
| 76 | Rheem Water Heater Error Code 76: How to Fix It | medium | Easy |
| 8 | Rheem HVAC Error Code 8: How to Fix It | high | Medium |
| 8 Flash | Rheem HVAC Error Code 8 Flash: How to Fix It | medium | Medium |
| 81 | Rheem HVAC Error Code 81: How to Fix It | critical | Hard |
| 82 | Rheem HVAC Error Code 82: How to Fix It | critical | Hard |
| 9 | Rheem HVAC Error Code 9: How to Fix It | critical | Medium |
| 9 Flash | Rheem HVAC Error Code 9 Flash: How to Fix It | high | Medium |
| 91 | Rheem HVAC Error Code 91: How to Fix It | critical | Hard |
| 92 | Rheem HVAC Error Code 92: How to Fix It | high | Medium |
| 93 | Rheem HVAC Error Code 93: How to Fix It | high | Medium |
| 94 | Rheem HVAC Error Code 94: How to Fix It | critical | Hard |
| 9F | Rheem HVAC Error Code 9F: How to Fix It | medium | Medium |
| E1 | Rheem Water Heater Error Code E1: How to Fix It | high | Hard |
| E2 | Rheem Water Heater Error Code E2: How to Fix It | high | Medium |
| E3 | Rheem Water Heater Error Code E3: How to Fix It | critical | Easy |