Electrolux Dryer Error Code H3/B3

The H3/B3 code means the dryer's control board has detected that the incoming power supply amplitude is too low. The board monitors the AC voltage waveform continuously, and this fault is triggered when voltage falls below the acceptable operating range. The issue typically points to a problem with the home's electrical supply rather than a failed dryer component. Diagnostic test (7) is the first step for evaluating this condition.

Resetting the dryer by disconnecting power may temporarily clear the error code, but the fault will return if the underlying low-voltage condition is still present. The H3/B3 code is triggered by a real-time measurement of the power supply, so it will reappear as soon as the dryer powers on and detects the same low amplitude. The root cause in the electrical supply must be corrected for the error to stay cleared.

Repair costs vary depending on the cause. If the issue is a failing circuit breaker, replacement costs typically range from $50 to $150 including an electrician's labor. Outlet replacement or wiring repairs can range from $100 to $300 or more depending on the extent of the work. If the dryer's main control board is ultimately found to be at fault, board replacement parts and labor can range from $150 to $400. Getting the power supply evaluated first can prevent unnecessary part replacements.

Some causes of H3/B3 can be addressed by a knowledgeable DIYer, such as checking for a tripped breaker or inspecting the outlet for loose connections. However, working with 240V dryer circuits carries serious shock and fire hazards, so any work beyond resetting the breaker should be done by a licensed electrician or qualified appliance technician. Measuring live voltage at the outlet with a multimeter is a safe first step if you are comfortable using one properly.

It is not recommended to operate the dryer while this error is active. Running a dryer on low voltage can cause motors and heating elements to draw excessive current, which can overheat components and create a fire risk. The dryer may also perform poorly or fail to complete cycles. Address the power supply issue before resuming normal use.