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ffnuontrol Inlet Thermistor <br /> 7 e the Venturi motor is operating Check sensor wiring for damage. <br /> tly.*ce gas valve assembly. Measure resistance of sensor.* <br /> ea diagnostic code by resetting the Clean sensor of scale build-up. <br /> main power supply to the water heater. Replace sensor. <br /> tgoing Temperature �Gasave <br /> 7(psafety <br /> s too hot) <br /> shutdown because water heater Check flame rod and wire for damage. <br /> Confirm fan motor is functioning Check gas solenoid valve for open or <br /> correctly. short circuit.* <br /> Replace the gas valve assembly. Replace gas valve assembly. <br /> 7.Venturi Blockage Please call Rinnai technical <br /> First, follow the recommended solutions department <br /> for Diagnostic Code 10. <br /> If the Code 10 solutions do not correct High Exhaust Gas Temperature <br /> the problem, ensure the Venturi is not Ensure Heat Exchanger fins are clean <br /> blocked. and not blocked. <br /> Please call Rinnai technical department. Confirm inlet water temperature is not <br /> Electrical Grounding too high. <br /> Check all components for electrical Clear diagnostic code by resetting <br /> short. the main power supply to the water <br /> heater. <br /> Data Transfer Error <br /> Combustion Fan <br /> • If the PCB has been replaced, ensure <br /> the data transfer process has been Check the motor wire harness for <br /> completed. loose or damaged connections. <br /> Measure resistance of motor wire <br /> Condensate Pump (Accessory) harness.* <br /> Confirm wire connections and harness Ensure the combustion fan spins <br /> are good. freely. <br /> • Ensure condensate reservoir is empty Recirculation Low Flow <br /> and condensate pump is operating. Ensure bypass plug is removed and <br /> Out oin Thermistor bypass filter is installed. (COV Mode) <br /> Check sensor wiring for damage. Ensure both the inlet water filter and <br /> • Measure resistance of sensor.* bypass filter are clean and free of <br /> debris. <br /> • Clean sensor of scale build-up. Ensure Parameter setting are correctly <br /> Replace sensor. set for recirculation mode. <br /> Heat Exchanger Thermistor Ensure Pump supply voltage. <br /> Follow the steps above for Code 32 for Ensure air is removed from the <br /> troubleshooting. recirculation line. <br /> Exhaust Thermistor Water Flow Control <br /> • Check sensor wiring for damage. Measure resistance values of the <br /> Measure resistance of sensor.* water flow control.* <br /> Replace sensor. The water flow control valve has failed <br /> to close during the bath fill function. <br /> Freeze Protection Thermistor Immediately turn off the water and <br /> s above for Code 38 for discontinue the bath fill function. <br /> Follow the steps Contact a licensed professional to <br /> troubleshooting. service the appliance. <br /> * See "Electrical Diagnostics" on Technical Data PC Board <br /> Sheet located on inside front cover of water heater. Replace PC Board <br /> Rinnai Tankless Water Heater Installation and Operation Manual 78 <br />