Bradford White · AeroTherm Series G2

Bradford White AeroTherm Series G2 error code 6

Supply Voltage Fault

What it means

The voltage is too low at power-up. The control monitors the input line voltage one minute after power-up, and if the voltage is below 155 VAC, the fault code will be displayed.

Source: Installation and Operation Manual, Hybrid Electric Heat Pump Water Heater, 238-55123-00C (ECO 9059), page 34

Also listed in: Quick Service Guide, Heat Pump Water Heaters AeroTherm Series (Service Manual Supplement), 238-55219-00A, page 1

What Bradford White says to do

If a "Fault Code 6" is shown on the display, the water heater is not receiving the correct voltage as a result of incorrect wiring. To correct this fault, turn the power OFF to the water heater, correct the wiring issue, then turn the power back ON.

Source for these steps: Installation and Operation Manual, Hybrid Electric Heat Pump Water Heater, 238-55123-00C (ECO 9059), page 15

Last checked 2026-10-03.

Safety first

WARNING: Turn OFF the electrical supply to the unit before installation and before removing any access panels to service the heater. (p.3, p.24)
DANGER: Shut OFF power to the water heater before draining water to avoid electrocution. (p.29)
CAUTION: For your safety, do NOT attempt to repair the water heater or any of its parts. Refer any repairs to a qualified service technician. (p.28)

From the manufacturer's manual for this series.

The same code on other models

Codes mean different things on different heaters. Match the series to the model number on your rating label.