State Industries SUF-130- 300/400/500 instruction manual 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
Fault message on the LCD in this condition. See Power Supply	Power supply to water heater
Connections on page 58 for instructions on how to properly	has reversed polarity.
connect the power supply.
Note: Electronic flame sensing requires correct power supply	Call a service professional:
polarity AND a proper earth ground to the water heater and the
	Your Company Name Here
Main Burner. The control system does not verify earth ground
	(press [DOWN] for more....)
but this should be checked first if ignition failure occurs. See the
	CHANGE	BACK	ADVANCED
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 - see Power Supply Connections on page 58.		Ignition Failure
• Dirty/corroded flame sensor, clean flame sensor with fine steel
		Fault occurred 2 mins ago
wool (replace if damaged) - see Figure 2 on page 58.
	The water heater has failed to
• Loose or open wiring to the flame sensor.
	ignite the burner.
• Loose or open wiring to the 24 VAC Gas Valve.
• 24 VAC Gas Valve control knob in the "off" position - see Figure 56	Call a service professional:
on page 58 and Figure 57 on page 58.
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• Supply gas turned off, low gas volume - see page 58.
	(press [DOWN] for more....)
• Intake air and/or vent piping is restricted or improperly installed -	CHANGE	BACK	ADVANCED
see Venting Installation on page 58.
• Low or no manifold gas pressure to the Main Burner - see Initial
Start Up on page 58.
• The control system has detected the Low Gas Pressure Switch
contacts are open.	Low Gas Pressure
• Loose or open wiring to the Low Gas Pressure Switch - see Figure
		Fault occurred 2 mins ago
3 on page 58 for location.	The supply gas pressure to the
• Supply gas pressure is below the required minimum pressure - see
	water heater is low.
Table 4 on page 58.
• Supply gas is turned off at the Main Shutoff Valve.	Call a service professional:
• Supply gas pressure is dropping when other gas fired appliances
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on a common supply gas line are operating.
	(press [DOWN] for more....)
• Low volume of supply gas - see Supply Gas Line Installation on
	CHANGE	BACK	ADVANCED
page 58 and the requirements for the Supply Gas Line on page 58
and Supply Gas Regulator on page 58.
• The control system has detected low current (AC amps) from the
Hot Surface Igniter. The control system monitors igniter current
	Low Igniter Current
and will declare this Fault condition if the current is not at or above
the programmed minimum requirement - see the Sequence Of		Fault occurred 2 mins ago
Operation on page 58 for minimum igniter amp requirements.	Igniter current is low.
• Loose or open wiring to the Hot Surface Igniter - see Figure 2 on
page 58 for igniter location.
• Damaged, worn or open circuit Hot Surface Igniter.	Call a service professional:
Note: Hot surface igniters are wearing parts. Wear is directly	Your Company Name Here
related to heating cycle count. Heating cycle count can be viewed	(press [DOWN] for more....)
in the Heater Information menu - see Heater Information on page	CHANGE	BACK	ADVANCED
58. Increasing the Differential setting reduces heating cycle count -
see Operating Set Point And Differential Adjustment on page 58.
• The control system has detected the Blocked Exhaust Switch
contacts are open.		Blocked Exhaust
• The condensate drain is blocked filling the exhaust elbow with
		Fault occurred 2 mins ago
water - clear the condensate drain - see Figure 9 on page 58.
	The exhaust is blocked or
• Loose or open wiring to the Blocked Exhaust Switch - see Figure 3
	restricted. Ensure
on page 58 for switch location.	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....)
see Venting Requirements on page 58.
	CHANGE	BACK	ADVANCED
• Excessive wind outdoors pressurizing the vent system piping.
• Excessive negative air pressure in the installed space.

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