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Sounds like it may be a dirty flame sensor. It can be gently cleaned with steel wool or scotch bright pad (not emery or sand paper). Its a small rod that sits in the flame. I believe it is part of the spark ignition assembly on your model. Only open your burner compartment though if your are certain you have the skills (and perhaps gaskets etc) to reassemble it safely.
Above are the manuals required to diagnose and service your error code.
EA: No flame ionization detected with water flow.
Verify that all manual gas shut off valves are open.
Check gas type.
Reset error code and open a water tap to cycle the heater in an effort to purge air on new installations. Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater.
Check three wire connections to ignition group on the lower front of the heat exchanger are secure.
Check gas pressure.
Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod.
Check that the minimum power fan speed has been adjusted to the proper value.
Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If flame is unstable or yellow with proper gas pressure.
contact your gas company if the error code is "12," indicating that the gas supply was interrupted.
have a good day !! In LP models, the 12 error code may also appear if the LP gas supply has gotten low. To clear the code, replace or refill the LP gas supply.
it sounds like the flame sensor is dirty or faulty. when the pilot lights the flame sensor rod recognises the flame to allow the main gas valve to open and ignite the burners. you can clean the flame sensor with some steel wool or sandcloth
LP pressure needed is no less than 11 inches of water column while all gas appliances are in operation. Info is in the installation manual near checking CO2 levels.
If it has the little thermal cut-off in power wire to thermostat (has a little plastic jacket over it) try removing it, and connect female spade from power wire, directly to male spade on thermostat, and see what happens. Also, make sure electrode is positioned in flame good for flame sensing properly.
Have you tried positioning the electrode closer to where flame is? That also senses flame to keep gas valve open, and if not sensing flame, with cause it to shut down. Clean it with a small brass brush, or similar, and make sure it's getting good flame from burner directed at it. Let me know if that helps. Do you by chance have a multimeter, or 12 volt test light for troubleshooting ?
The ignitor is also a flame sensor. If it's not working to ignite, good chance it's not sensing flame to keep gas flowing as well. Could also be board.
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