Fisher & Paykel Dishwasher Error Code F40

• Verify the main water shutoff valve under your sink is fully open by turning it counterclockwise • Check that the dishwasher door is completely closed and the latch engages with a click • Inspect both hot and cold water inlet hoses at the back of the dishwasher for kinks, bends, or pinches; straighten any obstructions • Locate the inlet hose connection at the back of the dishwasher and check that it is hand-tight and not leaking • Turn off the dishwasher and reset it by switching off the circuit breaker for 60 seconds, then turn the breaker back on • Remove the bottom front panel access cover and locate the inlet valve filter screen; turn off water supply, disconnect the inlet hose, and rinse the filter screen with clean water to remove mineral buildup • Check that you are using the correct amount of dishwasher detergent for your water hardness and load size; excessive suds can interfere with water level detection • Verify your home's water pressure is adequate; if other faucets have weak flow, contact your water utility • Ensure the circuit breaker for your dishwasher in your electrical panel is in the ON position and hasn't tripped • If error persists after these checks, contact a professional appliance repair technician or appliance repair support service to diagnose and replace the water inlet valve or address control board issues