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GE Dishwasher Error Code H2O (No Water Detected)

H2O means the dishwasher isn’t detecting water entering the tub, usually the supply valve or a kinked line.

Risk: Low

Meaning

H2O appears when the dishwasher doesn’t detect water filling the tub within the expected time. The water supply valve under the sink being closed is the single most common cause, oddly common after a dishwasher is reinstalled or a sink is serviced.

The information provided here is a diagnostic aid and does not replace the intervention of a qualified professional.

Possible causes

No cause is certain until it has been checked on the appliance.

Very likely Water supply valve under the sink partially or fully closed
Likely Kinked or crushed water supply line
Possible Inlet water valve screen clogged with sediment
Possible Float switch stuck, falsely reporting the tub as full
Rare Water inlet valve failed

Tools needed

Flashlight
Adjustable pliers
Small brush
Bucket

First checks

Check the shutoff valve under the sink is fully open.
Follow the supply line from the valve to the dishwasher and look for kinks.
Lift the float cup inside the tub and confirm it moves freely up and down.
Run the kitchen faucet to confirm water pressure reaches that line at all.

Step-by-step diagnosis

Look under the sink and confirm the shutoff valve is fully open. A valve turned back for other work is the single most common cause.
Run the kitchen tap for a moment. No pressure at the tap means the problem is the house supply, not the dishwasher.
Follow the braided supply line from the valve to the dishwasher, checking for kinks and crush points where the unit was pushed back into its opening.
Reach inside the tub and lift the float cup, then let it fall. It must move freely. A float held up by a stray label reports a full tub that is not there.
Cut power and water, then unscrew the supply line at the inlet valve into a bucket. Pull the small screen out of the valve inlet and brush the sediment off it. This screen clogs slowly and starves the fill.
Reconnect, open the valve, and run a fill to watch water actually arrive.

What not to do

Replacing the water inlet valve before checking the supply valve is actually open.
Running repeat cycles hoping the code clears itself without checking the water supply.

When to stop

Water reaches the valve, the screen is clean, the float moves, and H2O still appears. The inlet valve has failed.
You find a wet fitting or a weeping valve body.

An error code varies by brand

The same code can have a different meaning depending on the brand and model. Always check your appliance's manual before acting.

Related guides

When to call a professional

If the simple checks turned up nothing, if the repair involves electricity, gas, or the sealed refrigerant system, or if you have any doubt at all: stop there and hand the appliance over to a qualified technician.