Bosch Dishwasher Error Code E:29

E:29 on a Bosch dishwasher means the appliance is detecting a supply voltage below approximately 98 VAC, which is the minimum required for proper operation. This low voltage condition can cause the wash cycle to stop abruptly, run for an unusually long time, or result in poor rinsing and drying. The code does not appear during the wash cycle itself and is only revealed when the diagnostic test program is run. The issue typically originates in the home's wiring rather than in the dishwasher itself.

Running the dishwasher with a low supply voltage is not recommended. Operating appliances below their rated voltage can cause overheating in motors and control components, potentially leading to premature failure or a safety hazard. It is best to resolve the voltage issue before continuing to use the appliance. Disconnect the dishwasher if you are unable to immediately diagnose the wiring problem.

If the problem is a loose wiring connection you can safely tighten yourself, the cost may be minimal. If an electrician is needed to evaluate or repair the household circuit, expect to pay somewhere in the range of $75 to $250 or more depending on the complexity of the work and local labor rates. If the dishwasher's internal power module turns out to be faulty, parts and labor for that repair can range from $150 to $400 or higher. Getting a diagnosis of the electrical supply first is the most cost-effective approach.

Start by running the dishwasher's test program to confirm E:29 is stored as an active fault. Then use a multimeter to measure the AC voltage at the dishwasher's power supply connection and verify it reads between 98 and 120 VAC. Check all wiring connections at the circuit breaker, junction box, and the appliance's terminal block for looseness or corrosion. If voltage is consistently low, consult a licensed electrician to evaluate the circuit.

A reset may temporarily clear the stored fault code, but the E:29 error will return if the underlying low voltage condition is not corrected. Because the code does not display during normal operation, you may not notice it has returned until symptoms reappear or you run the diagnostic program again. Fixing the supply voltage issue is the only reliable way to permanently resolve this fault.