Rheem mini split error code P5

Common causes

• A blocked outdoor coil or failed fan.
• Low supply voltage.
• A failing compressor.
• A refrigerant overcharge.

How to fix it yourself

Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.

1. Look at the outdoor unit: clear leaves, cottonwood fluff, snow or ice from the coil and make sure the fan can spin freely and nothing is stacked against the cabinet.
2. If you own a multimeter and are comfortable using it, measure the supply voltage at the outdoor unit's L1 and L2 terminals with the unit running. A 230 V system should read roughly 208 to 253 VAC.
3. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

Technician check of compressor current and charge.

Which Rheem units show P5

This page applies to Rheem Classic and Classic Plus wall-mount (RIWH / ROWH), Endeavor Line multi-zone and Floating Air series (2023 and later) units on the Floating Air series (Friedrich-built, Gree platform). Rheem's own documentation lists P5 as "Compressor current protection", the same definition used across the Gree platform it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.

Where Rheem shows this code

Floating Air series (Friedrich-built, Gree platform): The code shows on the indoor unit's display in place of the temperature. If the display is off, press the Light button on the remote. Some models also count out the code as indicator blinks. E codes are system protections and faults, F codes are mostly sensor faults, H codes are outdoor and compressor protections, U codes are motor and valve faults, and P codes are power-supply faults.

Other Rheem codes

Same part of the system as P5:

All Rheem error codes

P5 on other brands

The same characters do not always mean the same thing. Check the brand on your unit.

• Pioneer P5 Mode conflict (multi-zone) / Condenser high temperature protection (outdoor display)
• Blueridge P5 Compressor current protection / Mode conflict (multi-zone)
• Gree P5 Compressor current protection
• Zone Air P5 Cooling mode sub-cooling (anti-freeze) protection
• Mitsubishi Electric P5 Drain pump fault (overflow protection)
• Carrier P5 Mode conflict (multi-zone)
• Trane P5 Cooling mode sub-cooling (anti-freeze) protection / Drain pump fault (overflow protection)
• Heil P5 Mode conflict (multi-zone) / Compressor current protection
• ACiQ P5 Mode conflict (multi-zone) / Cooling mode sub-cooling (anti-freeze) protection