Blueridge mini split error code P1

Common causes

• Utility voltage sagging or spiking (common in rural areas and during heat waves).
• Running on an undersized generator, extension cord or inverter.
• A loose connection at the breaker, disconnect or outdoor terminal block, dropping voltage under load.
• A failed capacitor or PFC circuit on the outdoor board.

How to fix it yourself

Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician.

1. 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.
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. With power off, tighten every power connection from the breaker to the outdoor unit.
4. If it happens only when other big loads start (well pump, dryer, EV charger), the branch circuit or service may be marginal. An electrician can check voltage drop.
5. A whole-house or dedicated HVAC surge protector is cheap insurance if your utility power is rough.

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

If supply voltage measures normal and the connections are tight, the outdoor board's power section is at fault and a technician should replace it.

Which Blueridge units show P1

This page applies to Blueridge BMKH wall-mount, floor-ceiling and multi-zone (2016 and later) and BMY / BMX S-series single-zone (2023 and later) units on the BMY / BMX S-series (Midea table, classic codes). Blueridge's own documentation lists P1 as "Over-voltage or under-voltage protection", the same definition used across the Midea platform (classic codes) 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 Blueridge shows this code

BMY / BMX S-series (Midea table, classic codes): The code appears on the indoor unit's LED display in place of the set temperature. Some models also blink the indicator lamps in a pattern that matches the code. E codes are faults in the indoor unit or its communication link, F codes are faults on the outdoor side, and P codes are protections: the outdoor unit has stopped itself to prevent damage. EC is the refrigerant leak check.

Other Blueridge codes

Same part of the system as P1:

All Blueridge error codes

P1 on other brands

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

• Pioneer P1 Over-voltage or under-voltage protection / High pressure protection (outdoor display)
• Zone Air P1 Over-voltage or under-voltage protection
• Mitsubishi Electric P1 Indoor intake (room) air temperature sensor fault (open or short circuit)
• Carrier P1 Over-voltage or under-voltage protection
• Trane P1 Over-voltage or under-voltage protection / Indoor intake (room) air temperature sensor fault (open or short circuit)