What should I check first for Whirlpool washer error F20?

Check both the hot and cold faucets are completely turned on.

F20Low

Whirlpool washer error F20

F20 indicates a water inlet problem — no water, or not enough of it, reaching the washer.

Also shows as F2 0

Symptom
F20
Free checks
5 checks
Then the part
A supply tap not fully open

The 5 free checks

Start at the top. Unplug the machine first.

01
Check both the hot and cold faucets are completely turned on.
02
Check the water inlet screens for clogging.
03
Check the inlet hoses are not kinked.
04
Unplug the washer for 5 minutes, then plug it back in to reset the control.
05
Check the fill lines for kinks, and in winter for freezing.

What causes it

Listed most likely first.

Cause	How often	DIY
A supply tap not fully open	Most common	Yes
Water inlet screens clogged	Common	Yes
Inlet hose kinked	Common	Yes
An inlet water valve does not open when it is activated	Common	Call a pro

Before you check anything

Disconnect the power first. Unplug the machine at the socket, or switch off its circuit at the consumer unit if it is hard-wired. Do this before opening any panel, reaching into a pump filter, or moving the appliance.
Turn off the water before disconnecting a hose, and have a towel and a shallow tray ready — a drain hose holds water even when the drum looks empty.
Gas, mains wiring and sealed refrigeration are for a qualified professional — in many countries that is a legal requirement, not advice. If you smell gas, do not touch any switch: leave, and call your gas emergency number from outside.
Stop if you smell burning, see scorched wiring, or find water near an electrical connection. None of those is a code to look up.

The checks on this page are the manufacturer’s own, rewritten and sourced, and they are reference information rather than a repair instruction for your particular machine. Model, age and installation all change what is safe to do. You are the one standing in front of it — if a step looks wrong for the machine you have, trust that and call a technician.