How To Repair Code 391 Ao Smith Tankless Water Heater
AO Smith Tankless Error Codes
Troubleshooting Guide
Acquire nearly AO Smith tankless error codes for like shooting fish in a barrel and inexpensive troubleshooting. The repair guide covers indoor, outdoor, condensing, non-condensing, and ultra-depression NOx water heaters with on-demand technology.
Apply the AO Smith code guide to find the primary causes and solutions for the problems of the post-obit models: 110, 310, 510, 240, 340, and 540 series, for safety, convenience, and swell savings.
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AO Smith tankless h2o heaters equipped with the remote controller have a keen advantage; a self-diagnosing function that helps in diagnosing the heating problem. If there is a trouble with the water heater, an installed remote will make a sound, and the error code volition display on the screen. To have the unit working properly, it has to be supplied with the power and correct connection.
A guide to troubleshooting water heaters with the listed error codes beneath is useful for DIY homeowners, but our recommendation is e'er to become assist from a qualified technician.
If the remote controller is non installed on the water heater, and at that place is a problem, the error codes will be shown differently. For case, a model 510 will display the numerical code on the seven-Seg LED on the computer board, while the 110 and 310 models only a blinking red LED that can flash one time or more. Models from the 240, 340, and 540 series will show the fault codes on both temperature controller and remote controller.
Nosotros will presume that the tankless unit, earlier failure, was correctly installed (with the right gas blazon), per the manufacturer'south instructions and codes. The tools needed to solve the problems from below are mainly the screwdriver, manometer, and multi-meter.
AO Smith tankless error codes listing
To prepare the tankless water heater from AO Smith properly and fast, nosotros will show all three fault codes (in the subtitle), the kickoff for the units with the remote controller, the second for the units with the 7-Seg LED, and third are those heaters that do not have the remote... but blinking LED.
Error Code 03 (031), In one case
Problem: Incorrect dipswitch settings.
Solution: Cheque for the proper settings on the computer board.
Error Code 10 (101), Five times
Problem: Alarm for the "991" mistake code.
Solution: Check for blockage in the vents, the distance between the intake and frazzle terminals is per instructions, and remove if there is grease or clay in the gas burner and fan motor.
Error Code 11 (111), Three times
Problem: The ignition failure.
Solution: Cheque if the Hi-limit switch properly functions and that in that location is no loose or broken wire connections, no soot on the flame rod, or a damaged computer lath. Tin can you hear a buzzing spark ignition from the burner or two clunk sounds from the gas valve?
Error Code 12, 121, Three times
Problem: Flame loss.
Solution: Check for the proper settings on the computer board.
Fault Lawmaking 31, 311, Two times
Problem: Outlet thermistor failure.
Solution: Check if there is a loose or breakage in the wire connection or droppings on the thermistor.
Error Code 32, 321, Two times
Problem: Inlet thermistor failure.
Solution: Droppings on the thermistor, loose or broken wire connection.
Error Code 331, Ii times
Problem: Mixing thermistor failure.
Solution: Droppings on the thermistor, loose or broken wire connection.
Mistake Code 341, Two times
Trouble: Exhaust thermistor failure.
Solution: See the mistake codes 331, 321, and 311.
Error Lawmaking 39, 391, Two times
Problem: Problem with the air-fuel ratio rod - AFR.
Solution: Check for the soot on the AFR rod, wire connection, and breakage.
Error Code 441, Two times
Problem: Problem with the menses sensor.
Solution: Check the wire connection, wire breakage, and debris on the period sensor impeller.
Error Code 51, 55, 510, 551, Half-dozen times
Trouble: Abnormal gas solenoid valve.
Solution: Check for connection and wire breakage or reckoner board failure (burn down marks).
Error Code 61, 611, Four times
Problem: Fan motor fault.
Solution: Check for connection/breakage of wires, corrosion or frozen connectors, fan motor covered with dust, burn marks on the computer board.
Error Code 651, Iv times
Problem: Flow adjustment valve fault.
Solution: Connections or wire breakage of the flow aligning valve, scale buildup on the motor drive that gets locked, or there is water leakage.
Error Code 661, 4 times
Problem: Bypass valve mistake (merely model 540).
Solution: Connections or breakage of wires of the menses adjustment valve, scale buildup on the motor drive which gets locked, water leakage.
Fault Code seventy, 701, One fourth dimension
Problem: Problem with the computer lath.
Solution: Check for connection and breakage of wires, burn down marks on the computer lath, and power supply to the unit.
Error Code 711, Once
Trouble: Gas solenoid valve drive circuit failure.
Solution: See error codes 111 and 121.
Error Code 72, 721, Six times
Problem: Fake flame detection.
Solution: Check if the condensate drain is installed on the vent neckband of the heater. Is there leaking from the oestrus exchanger?
Error Lawmaking 74, 741, 751
Problem: Miscommunication betwixt the water heater and remote controller.
Solution: Cheque if the remote controller is of the right blazon, also connections between the water heater and remote.
Error Code 761
Problem: Miscommunication in an Easy-Link system.
Solution: Check the connections between water heaters.
Error Code 99, 991, V times
Problem: Improper gas combustion.
Solution: Is the water heater set for the right height? Look for the blockage in the vent system and ensure if the distance between the intake and frazzle is not too small. Check if there are any foreign particles or grease on the gas burner and fan motor. Is the surrounding air contaminated?
Keep in mind that the mistake codes are shown differently if the units are connected through the Easy-Link Arrangement... information technology can be seen what the error code is and which unit has it.
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