Error code

Rheem gas water heater error code A110

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Is A110 on a Rheem gas water heater an emergency?

Usually not an emergency. If you smell gas, do not touch switches or try to relight anything: leave, and call the gas utility or 911 from outside.

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What A110 means

“Shutoff Valve Test Close Error”

— Rheem, Rheem Residential Super High Efficiency gas water heater Use & Care manual (AP21831 Rev 2), alarm and alert codes. Codes vary by model: check your gas water heater’s own manual.

Where A110 fits

Next to A110 in Rheem’s table: T105 (Water Leak Sensor Not Installed) and A112 (Shutoff Valve Not Open: Heating Disabled).

What to try first

  • Call a qualified technician.

Safety: If you smell gas, do not touch switches or try to relight anything: leave, and call the gas utility or 911 from outside.

How urgent is it?

At least THIS WEEK. fixRAgent treats this code as a this-week repair: the appliance has reported a fault, but the code alone does not point at a safety hazard. This is fixRAgent’s reading, not the manufacturer’s. A photo can raise it — water near wiring, scorch marks, a gas smell — but a code never lowers what the photo shows.

Who to call

Plumber. Have the model and serial numbers from the label ready — a photo of the label works.

Recalls and manuals

Check whether your model is under a safety recall on the U.S. Consumer Product Safety Commission’s site: cpsc.gov/Recalls. Your owner’s manual is on Rheem’s support site; search it with the model number from the label.