Goodman Heat Pump Error Code E5

The E5 code on a Goodman heat pump means the low voltage control circuit fuse has blown due to a short in the low voltage wiring. The low voltage system runs at 24 volts and controls the thermostat, relays, and control board functions. The unit will not operate normally until the short is found, corrected, and the 3-amp fuse is replaced.

The heat pump will not operate while the fuse is open, so it is effectively locked out of normal operation. You should not attempt to bypass the fuse or install a higher-amperage fuse, as this removes protection from the low voltage wiring and control components and could cause further damage or a fire hazard.

Goodman specifies a 3-amp automotive blade-type fuse for the low voltage control circuit. This is a standard fuse available at auto parts stores and many hardware retailers. Always replace with the correct 3-amp rating, as installing a higher-rated fuse will defeat the circuit protection the fuse is designed to provide.

Resetting the unit or simply replacing the fuse without correcting the underlying short will not clear the E5 code permanently. The new fuse will blow again as soon as the circuit is re-energized with the short still present. The wiring fault must be located and repaired first for the repair to hold.

If the repair only involves finding a pinched or miswired low voltage wire and replacing the 3-amp fuse, costs are typically in the range of $75 to $200 for a service call. If a control board or thermostat was damaged by the short and needs replacement, costs can rise to the range of $250 to $600 or more depending on the components involved.