A.O. Smith 315456-002, GAHH-40, GAHH-50 installation instructions FV-SENSE and Open Flashing

cont.

		CONTROL DISPLAY STATUS	PROBLEM	SOLUTION
11.		“FV-SENSE” and “OPEN” Flashing		1. Check all wiring to the flammable vapor
			Flammable Vapor Sensor is open	sensor.
				2. Remove the connectors from the
				flammable vapor sensor and measure
				the resistance of the sensor with an
				ohmmeter.
				A. If the reading taken is more than
				1.7 million ohms, replace the
				flammable vapor sensor.
				B. If the reading taken is less than 1.7
				million ohms, and the wiring from
				the control to the sensor is good,
				replace the lower control.
12.		“FV-SENSE” and “SHORT” Flashing		1. Check all wiring to the flammable vapor
			Flammable Vapor Sensor is	sensor.
			shorted	2. Remove the connectors from the
				flammable vapor sensor and measure
				the resistance of the sensor with an
				ohmmeter.
				A. If the reading taken is less than
				2000 ohms, replace the flammable
				vapor sensor.
				B. If the reading taken is more than
				2000 ohms, and the wiring from the
				control to the sensor is good,
				replace the lower control.
13.		“THMSTR” and “OPEN” Flashing		1. Turn power off for 10 to 20 seconds then
			The self-diagnostic test has	on again to clear this error code.
			detected the temperature sensor	2. This part of the control cannot be
			(thermistor) inside the immersion
				replaced or serviced. If the error code
			probe is open.
				cannot be cleared, the lower control must
				be replaced.
14.		“THMSTR” and “SHORT” Flashing		1. Turn power off for 10 to 20 seconds then
			The self-diagnostic test has	on again to clear this error code.
			detected the temperature sensor	2. This part of the control cannot be
			(thermistor) inside the immersion
				replaced or serviced. If the error code
			probe is shorted.
				cannot be cleared, the lower control must
				be replaced.
15.		All Segments Flashing		1. Press and release each of the
			The self-diagnostic check has	temperature adjustment buttons. If the
			detected one or both of the	above action does not clear the error, the
			temperature adjustment buttons	control will continue to regulate the water
			are stuck.	temperature at the last setting. However,
				settings will no longer be adjustable – the
				upper control should be replaced.
16.		“P-ANODE” and “OPEN” Flashing		1. Check the wire that runs from the power
			No current to Power Anode.	anode to the upper control. Check the
				wire for damage, and to ensure that the
				connectors are fully seated into the
				mating connectors on both ends.
				2. Check that the tank is full of water. Never
				use this water heater unless it is
				completely full of water. To prevent
				damage to the tank, the tank must be
				filled with water. Water must flow from
				the hot water faucet before turning “ON”
				gas to the water heater.
	17.	“P-ANODE” Flashing		1. Turn the power off for 10 to 20 seconds
			Power Anode circuit failure.	then on again to clear the error code.
				2. If the error code persists or cannot be
				cleared, replace the upper control.

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