Bosch Dishwasher Error Code E:26

E:26 on a Bosch dishwasher indicates a fault with the water switch circuit. This code only appears during a diagnostic test program, not during a normal wash cycle. The cause is either a faulty water switch harness, a failed water switch, a failed water switch motor, or a failing power module. A voltage measurement at the water switch terminals is the key test to determine which component is at fault.

A power reset may temporarily clear the E:26 code from the display, but it will not resolve the underlying hardware fault. Because this code only surfaces during a diagnostic test program, you may not see it return immediately after a reset. The water switch circuit problem will persist until the faulty harness, water switch, water switch motor, or power module is actually repaired or replaced.

Repair cost depends on which component is at fault. A replacement wiring harness is typically the least expensive fix, while a new water switch or water switch motor generally falls in a moderate parts price range. Replacing the power module is usually the most costly repair. Adding professional labor, total repair costs can range from around $100 to $350 or more depending on parts pricing and local labor rates.

Diagnosing E:26 requires running a test program, performing continuity checks on the wiring harness, and measuring 120 VAC at live terminals, all tasks that carry an electrical shock risk and require a multimeter and some familiarity with appliance wiring. Knowledgeable DIYers comfortable working around line voltage can follow the diagnostic steps, but those unfamiliar with electrical testing should hire a qualified technician. Replacing the water switch or harness is relatively straightforward once the faulty component is confirmed.

Since E:26 does not display during a normal wash cycle, the dishwasher may continue to run, but the water switch fault means the control board may not be receiving accurate information about water flow or fill status. Running the appliance with a compromised water monitoring circuit carries a risk of improper fill levels or undetected water-related issues. It is best to diagnose and repair the fault before continued regular use.