Goodman Heat Pump Error Code 08

Error code 08 on a Goodman heat pump means the control board has detected incoming line voltage that is either below 185 VAC or above 255 VAC. This is outside the safe operating range for the unit. The system shuts down automatically to protect the compressor and other components from voltage-related damage.

No, you should not attempt to bypass or continuously reset the unit while code 08 is active. Abnormal supply voltage causes excessive current draw and heat in motor windings, which can result in compressor failure or electrical fires. The fault lockout is a protective function, and the underlying voltage problem must be resolved before returning the unit to service.

A power reset may temporarily clear the fault and allow the unit to restart, but the code will return if the supply voltage is still outside the 185 to 255 VAC range. Resetting without addressing the root cause risks damaging the compressor and other components. The fault must be resolved at the source, whether that is the wiring, breaker, disconnect, or utility supply.

Some causes of code 08 can be addressed by a knowledgeable homeowner, such as resetting a tripped breaker or tightening an obvious loose connection at the disconnect. However, measuring live voltage at the disconnect and contactor requires working near energized components and should only be done by a licensed technician. If the issue is with utility supply voltage, you will need to contact your local electric utility directly.

The repair cost depends entirely on the root cause. A simple connection tightening or breaker reset costs little to nothing, while replacing a circuit breaker typically runs between $150 and $350 including labor. If a full wire run replacement or utility service upgrade is needed, costs can range from $500 to several thousand dollars. A service call for diagnosis alone is typically between $75 and $150.