Symptoms
• Washing machine stops mid-cycle and displays AL error code on the control panel
• No water or insufficient water filling the drum
• Wash cycle fails to start or begins but stops immediately
• Error code remains displayed even after power cycling the machine
• Water inlet valves may emit unusual clicking or buzzing sounds
• Drum remains empty or partially filled when error occurs
Possible Causes
• Clogged or kinked inlet hoses restricting water flow
• Defective water inlet valve (common in Series 500/800 models)
• Low household water pressure below the machine's minimum requirement (typically below 20 psi in USA homes)
• Mineral deposits or sediment buildup in inlet filters
• Loose or disconnected water supply hoses at the wall or machine connection points
• Faulty water level sensor preventing proper fill detection
• Issues with the machine's electronic control board affecting water intake signals
• Cold water supply line frozen or blocked during winter months in northern USA regions
Safety Checks You Can Do
• Turn off and unplug the washing machine from the 120V outlet for 5 minutes, then plug back in and restart to reset the control board
• Check both hot and cold water supply valves behind the washing machine to ensure they are fully turned on (turned counterclockwise)
• Inspect the inlet hoses for visible kinks, cracks, or damage and straighten any bent sections
• Disconnect the inlet hoses from the back of the washing machine and check the mesh filters inside the connection points for debris or mineral buildup, rinsing with clean water if needed
• Test your home's water pressure by placing a bucket under a sink faucet and timing how quickly it fills; low pressure may indicate a household water supply issue requiring consultation with a plumber
• Verify that the inlet hoses are not kinked behind or underneath the machine where they may be hidden
• Check your home's circuit breaker panel to ensure the breaker for the washing machine is in the ON position
• Run a short test cycle without clothes to see if water fills normally
• Inspect connection points where hoses attach to both the wall water supply and the machine for loose fittings, and hand-tighten if necessary
• If error persists after these checks, the water inlet valve or control board likely requires professional service from an authorized Bosch technician
Safety First
Always disconnect the appliance from power before performing any checks. If you are unsure about any step, please contact a qualified technician.