Fault And Alert Conditions

•Colder incoming water temperature lengthening the time required to heat water to desired temperature.

•Hot water piping leaks, open faucets, water heater drain valve leaking or open.

•Sediment or lime scale accumulation may be affecting water heater operation. See Maintenance on page 60 for sediment and lime scale removal procedures.

•Water heater not firing at full input rating. Check manifold gas pressure, see instructions on page 51. Check actual firing rate of the water heater, see instructions on page 52.

Water Is Too Hot

•Operating Set Point is set too high. See Operating Set Point And Differential Adjustment on page 45.

•Upper and/or Lower Probe Offset settings improperly set - see Temperatures Menu (cont) on page 46.

•Improper water piping - see diagrams beginning on page 67.

Noisy Operation

•Sediment or lime scale accumulations can cause rumbling and pounding noises during heating cycles. See the Maintenance section of this manual beginning on page 60 for sediment and lime scale removal procedures.

•Normal operating noise of electrical components; Combustion Blower, transformer hum, relay contact closure.

Water Leakage Is Suspected

•Ensure the water heater drain valve is tightly closed.

•Check cleanout opening for leaks - see Figure 4 on page 9.

•Check inlet/outlet water connections and system piping.

•Check the Temperature-Pressure Relief Valve.

•Excessive water temperature.

•Excessive water pressure.

•Defective Temperature-Pressure Relief Valve.

Note: Excessive water pressure is the most common cause of Temperature-Pressure Relief Valve leakage. Excessive water system pressure is most often caused by "thermal expansion" in a "closed system." See Thermal Expansion and Closed Water Systems on page 14. The Temperature-Pressure Relief Valve is not intended for the constant relief of thermal expansion.

Temperature-Pressure Relief Valve leakage due to pressure build up in a closed system that does not have a thermal expansion tank installed is not covered under the limited warranty. Thermal expansion tanks must be installed on all closed water systems.

Replacement Parts

Replacement parts may be ordered from the manufacturer, authorized service agencies or distributors. When ordering parts be sure to have the complete water heater Model Number, Serial Number and Series Number available. This information can be found on the rating label affixed to the water heater.

Refer to the parts list included with the water heater from the factory for more information or call the parts department or technical support phone number listed on the back cover of this manual for further assistance.

Fault Conditions

When the control system declares a Fault condition it will display a Fault message on the control system's LCD with an exclamation "!" mark. The control system will lock out and disable heating operation until the condition is corrected. The water heater must be serviced by a qualified service agent before operation can be restored.

Alert Conditions

When the control system declares an Alert condition it will display an Alert message on the control system's LCD with a question "?" mark. The water heater will continue to operate during an Alert condition but the water heater must be serviced by a qualified service agent as soon as possible.

Resetting Control System Lock Outs

To reset the control system from a lock out condition; turn the power supply off for approximately 20 seconds and then back on. Keep in mind; if the condition that caused the Fault has not been corrected, the control system will continue to lock out.

Diagnostic Checks

Electrical Shock Hazard

•Turn off power to the water heater before performing any service.

•Label all wires prior to disconnecting when performing service. Wiring errors can cause improper and dangerous operation.

•Verify proper operation after servicing.

•Failure to follow these instructions can result in personal injury or death.

The following section, Fault And Alert Messages on page 58, lists some of the messages the control system will display on the LCD when there are operational problems. This is not a complete list. Along with each of the Fault and Alert messages described there will be a list of possible causes and things to check and repair.

Only qualified service agents, as defined in Qualifications on page 6, using appropriate test equipment, should perform any service procedures on the water heater.

Note: If you are not qualified and licensed or certified as required by the authority having jurisdiction to perform a given task do not attempt to perform any of the diagnostic or service procedures described in the following section.

If you do not understand the instructions in the following section do not attempt to perform any procedures.

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

Jumping out control circuits or components can result in property damage, personal injury or death.

•Service should only be performed by a qualified service agent using proper test equipment.

•Altering the water heater controls and/or wiring in any way could result in permanent damage to the controls or water heater and is not covered under the limited warranty.

•Altering the water heater controls and/or wiring in any way could result in altering the ignition sequence allowing gas to flow to the main burner before the hot surface igniter is at ignition temperature causing delayed ignition which can cause a fire or explosion.

Any bypass or alteration of the water heater controls and/or wiring will result in voiding the appliance warranty.