A.O. Smith PCG2J5040T3NOV 100, PCG6240T403NOV 100, GAHH 40 100 Control Display Troubleshooting

CONTROL DISPLAY TROUBLESHOOTING

	CONTROL DISPLAY STATUS	PROBLEM		SOLUTION
6.	“P-SW”, “OPEN”, and “CLEAN SCREEN” Flashing		1. Clean the screen on the combustion air
		The air pressure switch contacts	intake chamber. Turn the power “OFF” for
		remain open longer than 11	10 to 20 seconds then “ON” again to clear
		seconds after the combustion fan	the error code. If the problem persists:
		is energized.	2. Ensure the pressure switch sensing tube
			is in good condition and securely
			connected at both ends.
			3. Ensure the inner door to the combustion
			chamber is secure and the gasket is
			properly sealing.
			4. Check operation of the air intake chamber
			fan and pressure switch.
			A.	Turn off power to the water heater.
			B. Remove the tubing from the pressure
				switch and the wires from both
				terminals of the pressure switch.
			C. Connect a digital manometer to the
				open end of the tubing from the air
				intake chamber. Turn on the power to
				the water heater and when the fan turns
				on, measure the pressure reading in the
				tubing. If the pressure reading reaches
				the .22” WC make point of the pressure
				switch, turn off power to the water
				heater and reconnect tubing to the
				pressure switch. If pressure reading does
				not reach the .22” WC make point, check
				the system and tubing for restrictions
				and cleanliness.
			D. Attach leads of ohmmeter or continuity
				tester to the terminals of the pressure
				switch. Turn on power to the water
				heater and when the air intake fan
				comes on, check for continuity across
				the pressure switch contacts. If switch
				contacts remain open (no continuity)
				while the fan is in operation - replace
				the pressure switch.
7.	“P-SW” and “SHORT” Flashing	The air pressure switch contacts	1. Turn off power to the water heater.
			2. Locate the pressure switch wiring –
		remain closed for more than 5
			ensure pressure switch wiring is correct
		seconds when they should be
			and not jumped.
		open.
			3. Remove wires to both terminals on
			pressure switch.
			4. Check pressure switch contacts with an
			ohmmeter for continuity.
			A.	If pressure switch contacts show
				continuity (closed circuit) replace
				the pressure switch.
			B.	If pressure switch contacts show
				open circuit and all wiring is correct
				– replace the lower control.
8.	“IGN” Flashing	Open ignitor circuit	1. Check all wiring to the hot surface ignitor.
			2. Check the 3 pin Molex ignitor assembly
			plug and receptacle on the lower control
			for a good connection. Repair or replace
			parts if necessary.
			3. Check resistance of the ignitor with an
			ohmmeter on the ignitor assembly plug.
			Replace ignitor if resistance is not within
			1.72 and 2.40 ohms.
			4. If above checks are good – turn off
			power for 10 seconds and then back on.
			If this error code will not clear and the
			ignitor resistance is within specifications
			– replace the lower control.
9.	“FV-SENSE” Flashing	Flammable Vapor Sensor has	1. Do not touch any electrical switch, do not use
		detected the presence of	any phone in the building and do not try to
		flammable vapors and is in lockout	light any appliance.
			2. Smell around the water heater to ensure there
			are no gas leaks at the gas control valve or in
			the supply gas line or for any other type of
			flammable vapors in the area.
			3. Carefully inspect the area surrounding the
			water heater for any substances such as gas-
			oline, paint, paint thinners, varnish, or cleaners
			that could emit flammable vapors. Remove
			anything that can potentially emit flammable
			vapors from the area and store it properly in a
			different location.
				~ continued next page ~

21