Rheem Error Codes
Every Rheem error code we have catalogued, with what it means on site — 11 codes in total. In R-Pro, tap any code to get the meaning, likely causes and inspection steps, even with no signal in the plant room.
11 codes
| Code | What it means |
|---|---|
| 21 | Low pressure control open (low charge / frozen coil / dirty filter) |
| 29 | High pressure (dirty outdoor coil / fan off / overcharge) |
| 27 | Low or no line voltage |
| 28 | High line voltage |
| 1 Flash | Low pressure switch open |
| 2 Flash | High pressure switch open |
| 3 Flash | Defrost sensor failure |
| 4 Flash | Outdoor thermistor error |
| 5 Flash | Overcurrent protection |
| 6 Flash | Compressor overcurrent protection |
| 7 Flash | PCB communication error |
Official Rheem source / manual ↗
Look up any error code — offline — in R-Pro.
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