Error 11 is a common ignition fault. It means your water heater failed to light. Causes may include no gas supply, a faulty igniter, or issues with flame sensing.
You can do a basic check yourself: Open a hot water tap and listen—do you hear the fan start, gas valves clicking, and the igniter clicking? If you don’t smell any gas or hear ignition clicks, there may be no gas supply or a valve issue. If you hear ignition but no flame lights, the igniter or flame rod could be at fault. Either way, Error 11 requires professional attention.
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