A20 means water is not draining. The two listed causes are clogged filters and a blocked drain.
Model compatibility: Fisher & Paykel reuses codes across series and model years, so A20 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Fisher & Paykel gives A20 as a dishwasher that will not drain, caused either by clogged filters or by blocked drainage.
Water in the tub and A20 on the display
These two appear together. The manufacturer’s support article for A20 is laid out as a table with two rows, and each row holds one cause and its fix.
Cause 1: the filters are clogged
Bail out as much water as possible; a cup and a small towel will do.
Clean the filters.
Press START/PAUSE so the program carries on.
The article lists this one first.
Cause 2: the drain is blocked
Remove the standing water again. Then the article lists the following checks:
the drain hose has no kink in it;
the connection and the piping are correct and open;
on a new installation, the S-pipe drain spigot has been drilled out.
The spigot item concerns new installations only, and the article gives no reason for it.
Safety while checking
Turn the dishwasher off before your hands go near the filters or hose. Lay a towel on the floor for spills, and never work behind the unit while it is still connected to power. Sliding a built-in dishwasher out of its cabinet can strain the hoses, so get help if it has to be moved.
If the water does not go away
The last line of the article says that if troubleshooting fails, a service technician is needed. No further owner step is given. Tell the technician about the filter cleaning and hose check so the visit begins further on.
Related
A3 is the DishDrawer’s own drain code, with hose and pipe checks of its own.
Dishwasher drain service in Los Angeles
Ring (310) 872-1939 when A20 will not clear, and ask for Fisher & Paykel dishwasher repair in Los Angeles. The model number should be at hand when you call.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Fisher & Paykel appliance?
Book a specialist visit for a clear estimate and approval before any repair.
