The A20 error on a Fisher and Paykel dishwasher typically indicates a problem with the flood switch. The flood switch is a safety feature that detects if there is an excessive amount of water in the dishwasher's base, signaling a potential leak or water overflow issue. If you've already checked the hose and filter and ruled out any clogs or blockages, there are a few other steps you can take to troubleshoot and potentially fix the A20 error:
Unplug the Dishwasher: To ensure your safety, disconnect the dishwasher from the power source by unplugging it or turning off the circuit breaker.
Check for Water in the Base: The flood switch may trigger the A20 error if there is any water collected in the base of the dishwasher. Carefully remove the lower front panel of the dishwasher and check for any standing water in the base. If you find water, soak it up with a sponge or towel.
Inspect for Leaks: Once you've removed any standing water, run a short cycle with the front panel off and observe if any water is leaking from any components or connections. If you identify a leak, you may need to replace a faulty hose, seal, or other parts causing the issue.
Test the Float Switch: The float switch is responsible for signaling the flood switch. Check if the float is moving freely and not obstructed by any debris. Gently move the float up and down to ensure it moves smoothly and isn't stuck.
Reset the Dishwasher: After addressing any potential issues, reset the dishwasher by plugging it back in or turning on the circuit breaker. Press the power button to turn it on and see if the A20 error is still present.
Contact Customer Support or a Technician: If the A20 error persists despite your troubleshooting efforts, it may indicate a more complex problem. In such cases, it's best to contact Fisher and Paykel customer support or seek assistance from a qualified technician who can diagnose and repair the dishwasher.
Remember to exercise caution while troubleshooting and working with electrical appliances. If you're unsure about any steps or encounter any difficulties, it's safer to seek professional help rather than attempting complex repairs on your own.