Rheem Tankless Water Heater Error Code 11: Flame Failure Error Code 11
Error code 11 indicates that the water heater has failed to ignite, resulting in no hot water. This is typically caused by issues with the gas supply, igniter, or flame sensor.
Flame Sensor
Factory OEM Part #: 100108303
Igniter Assembly (OEM #100108304)
Multimeter Resistance & Harness Pinout Specs
Unplug Power Before ProbingStep-by-Step Disassembly & OEM Part Replacement
Unplug & Access Panel
Turn off the power to the water heater and remove the access panel to reach the internal components.
Locate Component
Identify the flame sensor and igniter assembly located near the burner assembly.
Multimeter Ohm/Voltage Check
Using a multimeter, check the resistance of the flame sensor; it should read between 0-5 Ohms.
Swap New OEM Part
If the flame sensor is faulty, replace it with the new OEM part and reassemble the access panel.
Frequently Asked Questions (Rheem Code 11)
How do I reset the error code 11?
To reset error code 11, turn off the power to the unit for 30 seconds and then turn it back on.
What should I check if the error persists after replacing the flame sensor?
If the error persists, check the gas supply and ensure that the igniter is functioning properly.
Shows panel removal, multimeter Ohm test, and OEM #100108303 replacement.
Order Both Culprit Parts Together
Technicians recommend inspecting both #100108303 and #100108304 while the appliance panel is open:
Check #100108303 In-Stock →