American Water Heater 318935-003 installation instructions Status Light Code Troubleshooting Chart

STATUS LIGHT CODE TROUBLESHOOTING CHART

LED STATUS	PROBLEM	CORRECTIVE ACTION
0 FLASHES (LED NOT LIT)	Pilot light is not lit. Not enough	Follow the lighting instructions on the front of the
	power (millivolts) to keep it lit.	water heater and record any diagnostic codes.
		See Diagnostic Status Light Code section.
1 FLASH (EVERY 3 SECONDS)	Normal operation.	No corrective action necessary.
2 FLASHES	Insufficient power (millivolts) to the	1. Check all wiring connections. If problem
	gas control valve/thermostat.	persists proceed to step 2.
		2. Replace the thermopile. See “Replacing the
		Pilot/Thermopile Assembly.”
4 FLASHES	High water temperature has	Replace the gas control valve/thermostat. See
	activated the over heat sensor.	“Removing and Replacing the Gas Control Valve/
		Thermostat.”
5 FLASHES	Water temperature sensor failure	Replace the gas control valve/thermostat. See
		“Removing and Replacing the Gas Control Valve/
		Thermostat.”
7 FLASHES	Gas Control Valve/Thermostat	Replace the gas control valve/thermostat. See
	failure.	“Removing and Replacing the Gas Control Valve/
		Thermostat.”
8 FLASHES	This condition only appears if the	Make sure that the gas control valve/thermostat
	gas control/temperature knob has	knob is set to OFF. Wait one minute. Remove
	been turned off and the thermopile	the outer door. Look through the sight glass for
	continued to produce electric	a pilot flame. If a pilot flame is observed with the
	power. This condition can occur if	gas control valve/thermostat knob set to the OFF
	the thermopile does not cool down	position, the pilot valve is stuck open. Turn the
	as quickly as expected when the	main gas supply OFF. Replace the gas control
	unit is shut off. This condition	valve/thermostat. For instructions, see “Removing
	can also occur if the gas control/	and Replacing the Gas Control Valve/Thermostat.”
	temperature knob has been	If the pilot flame is not observed when the gas
	turned off and the pilot continues
		control valve/thermostat knob is set to the OFF
	to operate because the pilot valve
		position, wait 10 minutes for the thermopile to cool,
	is stuck in the open position.
		then attempt to relight the pilot by following the
		lighting instructions on the water heater’s label.
		If this condition returns, replace the gas control
		valve/thermostat. See “Removing and Replacing
		the Gas Control Valve/Thermostat” for instructions.
9 FLASHES	Combustion chamber temperature	1. Check all connections. If the problem persists,
	sensor circuit is open or shorted	proceed to step 2.
		2. Replace the temperature sensor.
		(Temperature sensor replacement must be
		performed by a qualified person.) If the
		problem persists, proceed to step 3.
		3. Replace the gas control valve/thermostat. For
		instructions, see “Removing and Replacing
		the Gas Control Valve/Thermostat.”
10 FLASHES	LDO occurrence was detected	1. Reset the system by following these steps: 1.)
	in the combustion chamber	Turn the temperature adjustment knob to OFF.
	(contaminants)	2.) Unplug the thermopile plug from the gas
		control valve/thermostat. 3.) Wait for about
		three minutes. 4.) Plug the thermopile plug
		back into the gas control valve/ thermostat.
		5.) Turn the temperature adjustment knob to
		PILOT and restart the water heater as directed
		in this manual. If the problem persists, proceed
		to step 2.
		2. Follow the procedure outlined in “Cleaning the
		Combustion Chamber and Flame-Trap.”
		If the problem persists, proceed to step 3.
		3. Shut off the gas supply to the water heater
		and contact Technical Assistance. The
		telephone number is listed on the cover of this
		manual.

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