Bosch Dishwasher Error Code 2H

2H means the control board recorded that the last wash cycle took longer than 99 minutes to complete. The most common reasons are cold incoming water, a failed heating element, a faulty NTC temperature sensor, a tripped Hi-Limit thermostat, or a defective heater relay on the control module. The board stores this code after the cycle ends rather than stopping the cycle mid-run.

The dishwasher will generally still run cycles after displaying 2H, since the code is logged at cycle end rather than as a hard lockout. However, if the heating system is faulty, dishes are not being sanitized properly and heavily soiled loads will not clean well. Running the machine repeatedly with a heating fault can also cause the Hi-Limit thermostat to trip again or put additional stress on the control board. Address the root cause before continuing regular use.

A reset, typically performed by pressing and holding the Start button for 3 to 5 seconds or cutting power at the breaker, will clear the 2H display. However, if the underlying cause is not resolved, the code will return after the next cycle again exceeds 99 minutes. Use the reset to clear the code after you have addressed the root cause, not as a substitute for diagnosing the heating system.

Start by running your kitchen hot water tap for 30 to 60 seconds before starting a cycle to ensure hot water reaches the machine. If the code returns, you need to test the heating element for continuity with a multimeter, check the NTC sensor resistance against Bosch specifications, and inspect the Hi-Limit thermostat and control board heater relay. A failed heating element or NTC sensor are the most common parts to replace and are DIY-accessible on most Bosch models if you are comfortable with basic appliance repair.

If the fix is simply preheating the water supply line, there is no cost. A replacement NTC temperature sensor typically runs $15 to $40 for the part. A new heating element for a Bosch dishwasher usually costs $30 to $80 in parts. A Hi-Limit thermostat is generally under $20. If the control module heater relay is the fault, the entire control board may need replacement, which can cost $100 to $250 for the part alone, making professional diagnosis worthwhile before purchasing that component.