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Error code reference

Goodman Air Conditioner Error Code br

Brown Out Protection engaged

Goodman codesGoodman air conditioner codes

Brown Out Protection engaged - power was lost or voltage is low.

First step from the service manual

Check for incoming power at correct voltage.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What br means on a Goodman air conditioner

The "br" error code on a Goodman air conditioner indicates that the Brown Out Protection feature has been triggered. This is a built-in safeguard within the control board designed to detect when incoming supply voltage drops below the acceptable operating threshold for the unit. When the control board senses insufficient voltage, it shuts down the system to prevent damage to motors, compressors, and other sensitive components that can be harmed by operating under low-voltage conditions.

Brown out conditions occur when the utility supply voltage sags below normal levels without a complete power outage. This can happen during periods of high electrical demand, utility grid instability, or due to wiring issues within the home or at the service panel. The compressor is particularly vulnerable to low-voltage conditions because it requires a strong, stable voltage to start and run reliably. Attempting to operate a compressor under low voltage leads to excessive current draw, overheating, and accelerated wear on the motor windings.

The first diagnostic step is to verify incoming power voltage at the unit's disconnect or contactor terminals using a multimeter. Standard residential systems require 208 to 240 volts AC at the unit. Voltage readings consistently below this range confirm a brown out condition. If voltage appears normal at the time of testing, the issue may be intermittent, occurring during peak load periods, and may require monitoring over time or coordination with the utility provider.

Source: manufacturer service documentation.

Common causes of br

  1. 01

    Utility grid voltage sag

    Wiring / connection

    During periods of high electrical demand, the utility supply voltage can drop below the minimum required level. This is especially common on hot summer days when many air conditioners are running simultaneously.

  2. 02

    Undersized or damaged wiring

    Wiring / connection

    Wiring from the electrical panel to the unit that is too small for the load, or that has loose or corroded connections, can cause significant voltage drop under load. Inspect all connections at the disconnect, contactor, and panel for signs of corrosion, burning, or looseness.

  3. 03

    Tripped or weak breaker

    Part replacement

    A circuit breaker that has partially tripped or is beginning to fail can allow some current through while failing to maintain proper voltage. A weak breaker may not trip fully but will cause voltage instability at the unit.

  4. 04

    Overloaded electrical panel or circuit

    Wiring / connection

    If too many high-draw appliances share a circuit or if the main panel is overloaded, voltage at the air conditioner can fall below the acceptable range. Review the panel load and circuit allocation.

  5. 05

    Faulty control board

    Part replacement

    In rare cases, the control board itself may be misreading supply voltage and triggering brown out protection even when incoming voltage is within spec. This is typically diagnosed only after ruling out all external power supply issues.

See the test procedure for each cause

Frequently asked questions about br

What does br mean on a Goodman air conditioner?
The br code on a Goodman air conditioner stands for Brown Out Protection. It means the unit detected that incoming electrical voltage dropped below the safe operating threshold and shut itself down to prevent damage to the compressor and other components. The unit will remain in this protected state until supply voltage returns to an acceptable level.
Can I fix the br error code myself?
Some causes are DIY-friendly, such as checking and tightening loose connections at the disconnect box or identifying an overloaded circuit. However, if the issue involves utility voltage problems, damaged wiring inside the panel, or a failing breaker, a licensed electrician should handle the repair. Always shut off power to the unit before inspecting any electrical connections.
Will resetting the Goodman unit clear the br error?
Resetting the unit may temporarily clear the br code, but it will return if the underlying voltage problem is not resolved. If supply voltage has returned to normal, the unit should restart on its own or after a reset. A recurring br code points to an intermittent or ongoing low-voltage condition that requires investigation.
Is it safe to keep running my air conditioner when the br code appears?
No, you should not attempt to force the unit to operate when the br code is active. The brown out protection exists specifically to prevent compressor and motor damage that can result from low-voltage operation. Running a compressor under low voltage causes excessive current draw and heat, which can lead to premature compressor failure.
How much will it cost to fix the br error on a Goodman air conditioner?
Cost depends heavily on the root cause. If the issue is a utility problem or a simple loose connection, the fix may cost little to nothing. Breaker replacement typically runs in the range of $150 to $300 including labor. If wiring needs to be upgraded or a control board needs replacement, costs can range from $200 to over $600 depending on the scope of work and local labor rates.

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