Water heater (AO Smith, power vented) gives me error code "Error in the hot surface igniter circuit"

Question

Water heater in a rental unit was off for several weeks; now when it's been turned on it is giving an error code that translates to "Error in the hot surface ignitor circuit." The manual says to: 1) Check that all wiring is correct and secure; and 2) Replace hot surface ignitor. Nothing has changed with the wiring, so the logical answer would seem to be that I need to replace the hot surface ignitor--but the water heater is only 18 months old. The manufacturer will do a service call, but I have to pay for the labor cost, even if the part is under warranty. Any suggestions?

Answer 1

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Right beside the hot surface igniter you will see the flame sensor, make sure there is nothing touching the sensor. A small piece of lint or soot can ground the sensor. Be careful not to touch the igniter as they are very fragile. Do a visual inspection of the igniter and if it appears cracked or broken it will need to be replaced.