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 |
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| AC Reversed |
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out and disable heating operation if the polarity of the power supply |
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is reversed. The control system will display the “AC Reversed” |
| Fault occurred 2 mins ago |
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Fault message on the LCD in this condition. See Power Supply | Power supply to water heater |
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Connections on page 39 for instructions on how to properly connect | has reversed polarity. |
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the power supply. |
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Note: Electronic flame sensing requires correct power supply | Call a service professional: |
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polarity AND a proper earth ground to the water heater and the |
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Your Company Name Here |
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Main Burner. The control system does not verify earth ground |
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(press [DOWN] for more....) |
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but this should be checked first if ignition failure occurs. See the |
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CHANGE | BACK | ADVANCED |
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Ignition Failure Fault message information below. |
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• The control system has failed to ignite the Main Burner. |
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• Water heater is not properly grounded, loose or open ground wire |
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to the Main Burner - see Power Supply Connections on page 39. |
| Ignition Failure |
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• Dirty/corroded flame sensor, clean flame sensor with fine steel |
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| Fault occurred 2 mins ago |
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wool (replace if damaged) - see Figure 2 on page 7. |
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The water heater has failed to |
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• Loose or open wiring to the flame sensor. |
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ignite the burner. |
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• Loose or open wiring to the 24 VAC Gas Valve. |
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• 24 VAC Gas Valve control knob in the "off" position - see Figure 56 | Call a service professional: |
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on page 51. |
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Your Company Name Here |
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• Supply gas turned off, low gas volume - see page 37. |
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(press [DOWN] for more....) |
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• Intake air and/or vent piping is restricted or improperly installed - | CHANGE | BACK | ADVANCED |
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see Venting Installation on page 21. |
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• Low or no manifold gas pressure to the Main Burner - see Initial |
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Start Up on page 50. |
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• The control system has detected the Low Gas Pressure Switch |
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contacts are open. | Low Gas Pressure |
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• Loose or open wiring to the Low Gas Pressure Switch - see Figure |
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| Fault occurred 2 mins ago |
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3 on page 8 for location. | The supply gas pressure to the |
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• Supply gas pressure is below the required minimum pressure - see |
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water heater is low. |
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Table 4 on page 13. |
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• Supply gas is turned off at the Main Shutoff Valve. | Call a service professional: |
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• Supply gas pressure is dropping when other gas fired appliances |
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Your Company Name Here |
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on a common supply gas line are operating. |
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(press [DOWN] for more....) |
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• Low volume of supply gas - see Supply Gas Line Installation on |
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CHANGE | BACK | ADVANCED |
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page 37 and the requirements for the Supply Gas Line on page 13 and |
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Supply Gas Regulator on page 13. |
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• The control system has detected low current (AC amps) from the |
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Hot Surface Igniter. The control system monitors igniter current |
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Low Igniter Current |
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and will declare this Fault condition if the current is not at or above |
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the programmed minimum requirement - see the Sequence Of |
| Fault occurred 2 mins ago |
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Operation on page 58 for minimum igniter amp requirements. | Igniter current is low. |
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• Loose or open wiring to the Hot Surface Igniter - see Figure 2 on |
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page 7 for igniter location. |
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• Damaged, worn or open circuit Hot Surface Igniter. | Call a service professional: |
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Note: Hot surface igniters are wearing parts. Wear is directly | Your Company Name Here |
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related to heating cycle count. Heating cycle count can be viewed | (press [DOWN] for more....) |
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in the Heater Information menu - see Heater Information on page | CHANGE | BACK | ADVANCED |
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47. Increasing the Differential setting reduces heating cycle count - |
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see Operating Set Point And Differential Adjustment on page 45. |
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• The control system has detected the Blocked Exhaust Switch |
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contacts are open. |
| Blocked Exhaust |
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• The condensate drain is blocked filling the exhaust elbow with |
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| Fault occurred 2 mins ago |
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water - clear the condensate drain - see Figure 9 on page 16. |
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The exhaust is blocked or |
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• Loose or open wiring to the Blocked Exhaust Switch - see Figure 3 |
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restricted. Ensure |
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on page 8 for switch location. | condensate hose is draining. |
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• Restricted/blocked vent piping - condensate trapped in low point. | Call a service professional: |
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• Excessive equivalent pipe length, exceeded the maximum number |
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Your Company Name Here |
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of 90° elbows or wrong pipe size used in the vent piping system - |
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(press [DOWN] for more....) |
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see Venting Requirements on page 22. |
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CHANGE | BACK | ADVANCED |
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• Excessive wind outdoors pressurizing the vent system piping. |
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• Excessive negative air pressure in the installed space. |
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