Ruud — RUTGH-84DVLN condensing tankless water heater

Code 12 · Condensing tankless gas water heater · easy

“No hot water since the weekend. The tankless heater clicks and tries to start when a tap opens, then quits, and the remote display shows code 12.”

Based on

Ruud error-code database — 12 (gas shut-off valve not fully opened)Ruud RUTGH-84DVLN use & care / service manual