Official GE Appliances support page for H2O / H20 in the GE Dishwasher H2O support scope scope. Pelledor links to the source and extracts only safe first checks.
Pelledor links to the official GE Appliances support page and does not host a redistributed copy.
Useful sections
Dishwasher - H20 in Display
Codes in this document
H2O / H20
Maintenance procedures
Confirm the display reads H2O or H20.
Check that the hot water valve under the sink is fully on.
Confirm recent plumbing work or a shutoff did not leave supply closed.
Check that the dishwasher is level if it can be assessed safely.
Warnings
Use the exact model manual and GE Appliances service channels when the official safe steps do not clear the code.
Other revisions
No alternate revision has been attached yet.
Source-backed notes
Dishwasher - H20 in Display
GE Appliances documents H20 as not enough water or no water entering the dishwasher and lists water valve, pressure, recent plumbing or shutoff changes, leveling, and cycle-option clearing checks.