A.O. Smith 317443-000, 100 Power Vent DV Series 120 AC Reversed, Fault And Alert Messages

Fault And Alert Messages

Call the technical support phone number listed on the back cover for further technical assistance or to locate a qualified service agent in your area.

Possible Causes - Check/Repair	Displayed Fault/Alert Message
• The water heater’s control system is polarity sensitive and will lock
		AC Reversed
out and disable heating operation if the polarity of the power supply
is reversed. The control system will display the “AC Reversed”		Fault occurred 2 mins ago
	Power supply to water heater
Fault message on the LCD in this condition.
Note: Electronic flame sensing requires correct power supply	has reversed polarity.
polarity AND a proper earth ground to the water heater and the
Main Burner. The control system does not verify earth ground	Call a service professional:
but this should be checked first if ignition failure occurs. See the
	Your Company Name Here
Ignition Failure Fault message information below.
	(press [DOWN] for more....)
	CHANGE	BACK	ADVANCED
• The control system has failed to ignite the Main Burner.
		Ignition Failure
• Water heater is not properly grounded, loose or open ground wire
		Fault occurred 2 mins ago
to the Main Burner.
	The water heater has failed to
• Dirty/corroded flame sensor, clean flame sensor with fine steel
	ignite the burner.
wool (replace if damaged).
• Loose or open wiring to the flame sensor.	Call a service professional:
• Loose or open wiring to the 24 V Gas Valve.
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• Supply gas turned off, low gas volume.
	(press [DOWN] for more....)
• Intake air and/or vent piping is restricted or improperly installed.
	CHANGE	BACK	ADVANCED
• Low or no manifold gas pressure to the Main Burner.
• The control system has detected low current (AC amps) from the
	Low Igniter Current
Hot Surface Igniter. The control system monitors igniter current
and will declare this Fault condition if the current is not at or above		Fault occurred 2 mins ago
	Igniter current is low.
the programmed minimum requirement.
• Loose or open wiring to the Hot Surface Igniter.
• Damaged, worn or open circuit Hot Surface Igniter.
Note: Hot surface igniters are wearing parts. Wear is directly	Call a service professional:
related to heating cycle count. Heating cycle count can be viewed	Your Company Name Here
in the Heater Information menu. Increasing the Differential setting	(press [DOWN] for more....)
reduces heating cycle count.	CHANGE	BACK	ADVANCED
• The control system has detected the Blocked Exhaust Switch
		Blocked Exhaust
contacts are open.
• The condensate drain is blocked filling the exhaust elbow with		Fault occurred 2 mins ago
	The exhaust is blocked or
water - clear the condensate drain.
	restricted. Ensure
• Loose or open wiring to the Blocked Exhaust Switch.
	condensate hose is draining.
• Restricted/blocked vent piping - condensate trapped in low point.	Call a service professional:
• Excessive equivalent pipe length, exceeded the maximum number
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of 90° elbows or wrong pipe size used in the vent piping system.
	(press [DOWN] for more....)
• Excessive wind outdoors pressurizing the vent system piping.
	CHANGE	BACK	ADVANCED
• Excessive negative air pressure in the installed space.

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