Here is a complete list of Rheem tankless hot water heater error codes and to see whats wrong with your Rheem water heater in Ontario.

 Tankless error codes listed below. Rheem Error Code 00 – This code indicates a power interruption or power supply problem. Check the power source and connections.

Rheem Error Code 11 – This code indicates a problem with the ignition or ignition sensor. Check the sensor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 12 – This code indicates a problem with the flame sensor. Check the sensor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 13 – This code indicates a problem with the gas supply or gas valve. Check the gas supply and valve, and replace or repair them as necessary.

Rheem Error Code 14 – This code indicates a problem with the thermal fuse. Check the fuse and wiring connections, and replace or repair them as necessary.

Rheem Error Code 15 – This code indicates a problem with the inlet water temperature sensor. Check the sensor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 16 – This code indicates a problem with the outlet water temperature sensor. Check the sensor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 21 – This code indicates a problem with the overheating sensor. Check the sensor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 24 – This code indicates a problem with the flow sensor. Check the sensor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 29 – This code indicates a problem with the neutralizer. Check the neutralizer and wiring connections, and replace or repair them as necessary.

Rheem Error Code 31 – This code indicates a problem with the inlet water filter. Check the filter and clean or replace it as necessary.

Rheem Error Code 32 – This code indicates a problem with the heat exchanger. Check the exchanger and clean or replace it as necessary.

Rheem Error Code 33 – This code indicates a problem with the combustion air supply. Check the air supply and connections, and clean or repair them as necessary.

Rheem Error Code 35 – This code indicates a problem with the fan motor. Check the motor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 51 – This code indicates a problem with the gas valve or wiring connections. Check the valve and wiring connections, and replace or repair them as necessary.

Rheem Error Code 52 – This code indicates a problem with the modulating gas valve or wiring connections. Check the valve and wiring connections, and replace or repair them as necessary.

Rheem Error Code 61 – This code indicates a problem with the fan motor or wiring connections. Check the motor and wiring connections, and replace or repair them as necessary.

Rheem Error Code 70 – This code indicates a problem with the communication between the control board and the remote control. Check the connections and reset the remote control.

Rheem Error Code 71 – This code indicates a problem with the communication between the control board and the water flow control valve. Check the connections and replace or repair the valve as necessary.

Rheem Error Code 72 – This code indicates a problem with the communication between the control board and the remote control. Check the connections and reset the remote control.

Trying to service or repair your Rheem tankless water heater on your own can cause damage to the tankless unit. Ignoring these error codes and continuing to use your Rheem tankless water heater with issues can result in more damage and even more costly repairs if not repaired properly. 

It can even be dangerous trying to do the repair yourself if you have no licensed gas fitter. So, if you get any error codes with your Rheem tankless water heater, don’t wait to contact a licensed repair service provider for help with your Rheem water heater. We can help you avoid potential harm and make sure your tank unit is working properly.

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