Rheem Mini-Split Error Codes: Full Reference

by Dua Jones May 13, 2026

Rheem mini-splits display fault codes on the indoor unit's LED display panel or through their EcoNet connected home system for WiFi-enabled installations. Rheem's ductless error code system uses alphanumeric designations broadly consistent with standard industry conventions. This guide covers the most common Rheem mini-split error codes and recommended first steps.

Common Rheem Mini-Split Error Codes

Error Code	Meaning	DIY Fix?	First Step
E1	High pressure protection	Partially	Clear outdoor unit airflow; reset at breaker
E2	Low pressure / refrigerant issue	No	Call EPA-certified technician — refrigerant leak check
E4	Compressor overload / overheating	Partially	Clear outdoor unit; reset; call tech if recurring
E6	Communication error (indoor to outdoor)	Partially	Reset at breaker; inspect signal wire connections
F1	Indoor intake temperature sensor fault	No	Reset; call tech if recurring — thermistor
F2	Indoor coil temperature sensor fault	No	Call technician — thermistor replacement
P1	Freeze protection — coil too cold	Yes	Clean filter; let coil thaw; restart
P4	Drain fault / condensate blockage	Yes	Clear the condensate drain line

EcoNet Connected System

Rheem mini-splits that are connected to the EcoNet smart home platform can report error codes and system status directly in the EcoNet app. Connected users benefit from push notifications when a fault occurs and can view the fault history — useful for identifying intermittent faults that clear before they can be read on the unit display. Check the EcoNet app for active fault codes before performing a breaker reset.

Frequently Asked Questions

My Rheem mini-split shows P1 repeatedly — what does that mean?

P1 (freeze protection) is almost always caused by restricted airflow over the evaporator coil — most commonly a dirty filter. Clean the filter thoroughly, allow the unit to sit off for 2 hours so any ice can melt completely, then restart. If P1 returns after cleaning, reduced fan motor output or low refrigerant charge are the next possibilities — both require technician diagnosis.

How do I reset a Rheem mini-split error code?

Turn the unit off at the remote, switch the dedicated breaker off for 30 seconds, then restore power. Wait 3 full minutes before operating — Rheem compressors have a built-in protection delay after power restoration. If the same code returns immediately, the underlying fault persists and needs to be addressed rather than cleared.