American Water Heater (A)BCG38T500-8P ユーザーズマニュアル

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Servicing should only be performed by a Qualifi ed Service Agent

4   Check molex plug connector between igniter/flame sensor assembly and control board; 

Also check flame sense (12 pin) plug connection at control board.

Igniter not sensed and/or water heater not grounded.
1   Test igniter resistance.  It should should be 11 - 20 ohms. Replace igniter if open 

continuity.

2   Ensure that the water heater is grounded. Check all ground wires on heater and 

controls.

3   Check molex plug connector between igniter/flame sensor assembly and control board.  

Also check igniter (4 pin) plug connection at control board.

Flame sensed out of sequence; continuous flame sensed for more than 5 seconds 
without gas valve being energized.  
1   Ensure that the gas valve is not failing to close at the end of the heating cycle.

Internal control board failure. 
1   Replace ignition control board.