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Rheem Error Code 11: Rheem Code 11 - No Ignition
⚠️ This error indicates a failure to ignite the gas, which could lead to a dangerous gas buildup. Shut down the unit immediately and call a qualified technician.
How to Fix Rheem Code 11
- Step 1: Ensure the gas supply to the unit is turned on. Check the shut-off valve on the gas line leading to the water heater.
- Step 2: Reset the unit by turning it off and then back on. See if the error clears. If it returns, do not continue to reset it.
- Step 3: Call a qualified HVAC technician or plumber to diagnose and repair the problem. Do not attempt to troubleshoot gas-related issues yourself.
What Does Rheem Error Code 11 Mean?
Rheem error code 11 signals that your tankless water heater attempted to ignite the burner but failed. This means the unit went through its startup sequence, including the fan starting and the igniter sparking, but the main burner flame didn't establish itself. The water heater will typically try a few times before locking out on this error. This is a critical safety issue because unburned gas can accumulate, creating a risk of explosion or carbon monoxide poisoning. It's important to address this problem right away to ensure your safety and the proper operation of your water heater.
Common Causes of Rheem Code 11
- Gas supply issues (gas valve closed, low gas pressure)
- Faulty or dirty flame sensor
- Igniter failure
- Blocked or restricted vent system
- Defective gas valve
Applicable Rheem Models
Need a Pro to Fix Rheem Code 11?
This error requires immediate attention from a licensed HVAC technician. Do not attempt repair yourself.
Find a Licensed Tech Near You →Replacement Parts for Rheem Tankless Water Heater Code 11
Flame Sensor OEM: AP14914
Igniter OEM: AP14838
Gas Valve