During our visit, the customer mentioned he recently had an error code on his hybrid water heater. The code that was present was A101. I spoke with the customer and let him know that I needed to do a troubleshoot on the unit to figure what needed to be done. After inspecting the unit and speaking with Rheem, they recommended that the suction thermistor sensor gets replaced. I had the part ordered through Rheem. The customer will get an email from fedex once the part ships. This water heater is outside of the labor warranty. The customer will be responsible for labor cost. An estimate was created for when the part arrives.