59
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 at the breaker 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
Turn off power at the branch circuit
breaker serving the water heater
before performing any service.
Electrical Shock Hazard
•
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
60, 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
technician 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.
•
Any bypass or alteration of the water
heater controls and/or wiring will result
in voiding the appliance warranty.
• Sediment or lime scale accumulation may be affecting
water heater operation. See Maintenance on page 62 for
sediment and lime scale removal procedures.
• Water heater not firing at full input rating. Check actual firing
rate of the water heater, see instructions on page 55. Note
that the water heaters covered by this manual are capable
of modulating their firing rate. The firing rate is dictated by
the hot water draw and various other temperature limitations.
WATER IS TOO HOT
• Operating Set Point is set too high. See Operating Set Point
And Differential Adjustment on page 47.
• If installed check Thermostatic Mixing Valve settings
• Upper and/or Lower Probe Offset settings improperly set - see
Temperatures Menu (cont) on page 48.
• Lime build-up on temperature probes. Inspect and Clean.
• Improper water piping - see diagrams beginning on page 68.
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 62
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 AND ALERT CONDITIONS
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 "?"
