Fault And Alert Messages - A.O. Smith Vertex 100 Power Vent DV Series 120 Instruction Manual

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
• The water heater's control system is polarity sensitive and will lock
out and disable heating operation if the polarity of the power supply
is reversed. The control system will display the "AC Reversed"
Fault message on the LCD in this condition.
note: Electronic flame sensing requires correct power supply
polarity AND a proper earth ground to the water heater and the
Main Burner. The control system does not verify earth ground
but this should be checked first if ignition failure occurs. See the
Ignition Failure Fault message information below.
• The control system has failed to ignite the Main Burner.
• Water heater is not properly grounded, loose or open ground wire
to the Main Burner.
• Dirty/corroded flame sensor, clean flame sensor with fine steel
wool (replace if damaged).
• Loose or open wiring to the flame sensor.
• Loose or open wiring to the 24 V Gas Valve.
• Supply gas turned off, low gas volume.
• Intake air and/or vent piping is restricted or improperly installed.
• Low or no manifold gas pressure to the Main Burner.
• The control system has detected low current (AC amps) from the
Hot Surface Igniter. The control system monitors igniter current
and will declare this Fault condition if the current is not at or above
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
related to heating cycle count. Heating cycle count can be viewed
in the Heater Information menu. Increasing the Differential setting
reduces heating cycle count.
• The control system has detected the Blocked Exhaust Switch
contacts are open.
• The condensate drain is blocked filling the exhaust elbow with
water - clear the condensate drain.
• Loose or open wiring to the Blocked Exhaust Switch.
• Restricted/blocked vent piping - condensate trapped in low point.
• Excessive equivalent pipe length, exceeded the maximum number
of 90° elbows or wrong pipe size used in the vent piping system.
• Excessive wind outdoors pressurizing the vent system piping.
• Excessive negative air pressure in the installed space.
dIsplaYed fault/alert MessaGe
AC Reversed
Power supply to water heater
has reversed polarity.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
Ignition Failure
The water heater has failed to
ignite the burner.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
Low Igniter Current
Igniter current is low.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
Blocked Exhaust
The exhaust is blocked or
restricted. Ensure
condensate hose is draining.
Call a service professional:
Your Company Name Here
(press [DOWN] for more....)
CHANGE
54
Fault occurred 2 mins ago
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Fault occurred 2 mins ago
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Fault occurred 2 mins ago
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Fault occurred 2 mins ago
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