State Water Heaters SUF 60120 THRU, Instruction Manual

Page: 60 / 80

60
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
(page 61),
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
(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.
WATER IS TOO HOT
• Operating Set Point is set too high. See
Operating Set Point
and Differential Adjustment
(page 48).
• If installed, check Thermostatic Mixing Valve settings.
• Tank Probe Offset setting improperly set - see
Temperatures
Menu
(page 48).
• Lime build-up on temperature probes. Inspect and Clean.
• Improper water piping - see
Water Piping Diagrams
(page
69) .
NOISY OPERATION
• Sediment or lime scale accumulations can cause
rumbling and pounding noises during heating cycles.
See
Maintenance
(page 63) 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
(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
(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. See
Commercial
Water Heater Limited Warranty
(page 76) .
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 "?"
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