The UP code on a Bosch dishwasher usually signals a problem with water intake—either the appliance isn’t getting enough water, or there’s a blockage preventing proper flow. Follow these step-by-step troubleshooting tips to resolve it:
Step 1: Verify the Water Supply
- Make sure the main water tap connected to your dishwasher is fully open.
- Inspect the water inlet hose for bends or kinks that could restrict flow.
- Ensure your household water pressure is within the Bosch recommended range (usually 20–120 psi).
Step 2: Clean the Inlet Filter
- Turn off both the dishwasher and water supply.
- Disconnect the inlet hose from the back of the appliance.
- Locate the small mesh filter inside the hose connector. Rinse it under running water to remove debris.
- Reconnect the hose and turn the water back on.
Step 3: Check the Float Mechanism
- Open the dishwasher and locate the float (usually a small dome at the bottom).
- Press it gently to confirm it moves freely—this component tells the machine when it has enough water.
- Clean around the float to remove dirt or soap buildup that could block movement.
Step 4: Reset the Dishwasher
- Many error codes disappear after a reset.
- Press and hold the Start/Reset button for 3–5 seconds (check your model’s manual).
- Let the dishwasher drain and restart to see if the error clears.
Step 5: Inspect the Water Inlet Valve
- If the UP code persists, the water inlet valve may be malfunctioning.
- Look for loose connections, debris, or signs of wear.
- Replacing a faulty valve typically resolves ongoing water supply errors.
Tips:
- Avoid overloading the dishwasher; this can affect water distribution.
- Regularly clean spray arms and filters to maintain smooth water flow.
- For consistent issues, contact a certified Bosch service technician.
Disclaimer: This guide is AI-generated for general informational purposes. For persistent errors or complex repairs, consult a qualified Bosch technician to ensure safe and proper maintenance.
