Tag: ao-smith
All the articles with the tag "ao-smith".
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A.O. Smith Water Heater E4 Error Code - Causes & Fix
E4 (or E04) on A.O. Smith electric tankless heaters means moisture or a leak detected inside the unit. Shut off power and water, find the leak, dry the cabinet, then test.
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A.O. Smith E2 Error Code - Causes & Fix
E2 means water temperature exceeded the high limit. Press the reset button on the thermostat. If the code returns, replace the control.
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A.O. Smith E21 Error Code - Causes & Fix
E21 means a shorted thermistor (TH-1 or T-Out). Most often the sensor itself has failed. Check wiring, then replace the thermistor.
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A.O. Smith Tankless E20 Error - Causes & Fix
E20 means the inlet thermistor is shorted. The fix is to replace the inlet temperature sensor or check its wiring and connections.
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A.O. Smith E10 Error Code - Causes & Fix
E10 means the inlet temperature sensor is open. Check the thermistor connection first, then replace the sensor if the code returns.
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A.O. Smith Tankless E06 Error - Causes & Fix
E06 on an A.O. Smith tankless heater means water temperature is too high. Run a hot tap for 5 minutes to clear the fault or check sensors.
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A.O. Smith Tankless E04 Error - Causes & Fix
E04 on an A.O. Smith electric tankless water heater means moisture or a leak is detected inside. Turn off power and water, then call support.
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A.O. Smith Tankless E02 Error - Causes & Fix
E02 means over-temperature: heated water exceeded the limit. Most often caused by low flow or a failing thermistor. Here's how to fix it.
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A.O. Smith E2 Error Code - Causes & Fix
E2 means over-temperature shutdown on A.O. Smith electric tankless heaters. Most common fix: replace the thermistor sensor.
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A.O. Smith E1 Error Code - Causes & Fix
E1 on an A.O. Smith tankless water heater means high-temperature shutdown. Most often caused by a faulty sensor or thermostat.
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AO Smith Water Heater 3 Flashes — What It Means and How to Fix It
AO Smith water heater flashing 3 times? This means the pilot is out or won't stay lit. Here's how to diagnose the thermocouple and thermopile and fix it yourself.
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AO Smith Water Heater 4 Flashes — What It Means and How to Fix It
AO Smith water heater flashing 4 times indicates an igniter fault or flame sense failure. Learn what causes it, how to test the igniter, and which parts fix it.
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A.O. Smith Water Heater E1 Error Code — Sensor Fault Guide
A.O. Smith water heater E1 error means a temperature sensor fault. This guide covers gas and electric models, sensor testing, and how to fix or replace the sensor.
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A.O. Smith Water Heater Error Codes Guide
Complete A.O. Smith water heater error code guide. Covers Vertex, Voltex, ProLine tankless, and commercial models with fault codes and technician fixes.