State Water Heaters SSE-5 Service Handbook
Commercial electric water heaters
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Service Handbook
commercial electric Water HeaterS
modelS SSe-5 tHru SSe-120
SerieS 100 and 102
inStallation conSiderationS - pre Service
cHecKS - Water Heater conStruction -
operation & Service - troubleSHooting
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Servicing SHould only be performed by a Qualified Service agent.
PRINTED IN THE U.S.A 1008
198337-000
1
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Summary of Contents for State Water Heaters SSE-5
- Page 1 Service Handbook commercial electric Water HeaterS modelS SSe-5 tHru SSe-120 SerieS 100 and 102 inStallation conSiderationS - pre Service cHecKS - Water Heater conStruction - operation & Service - troubleSHooting 500 Tennessee Waltz Parkway Ashland City, TN 37015 Servicing SHould only be performed by a Qualified Service agent.
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Page 3: Table Of Contents
COMMERCIAL ELECTRIC WATER HEATER SERVICE MANUAL TABLE OF CONTENTS LWCO (Low Water Cut Off) ..........47 INTRODUCTION ............... 2 Qualifications ..............2 Powered Anode Rod ............48 Service Warning ..............2 Electronic Controls ............49 Tools Required..............3 CCB - Central Control Board........50 INSTALLATION CONSIDERATIONS ........ -
Page 4: Introduction
INTRODUCTION INTRODUCTION This Service Manual is designed to be an aid in servicing and troubleshooting the commercial electric water heater models listed on the cover.The instructions, illustrations and procedures contained in this manual are used to verify proper operation and to diagnose and repair common service problems. -
Page 5: Instruction Manual
INTRODUCTION INSTRUCTION MANUAL Have a copy of the Instruction Manual that came with the water heater on hand for the correct model water heater you are working with before servicing. Installation information given in this Service Manual IS NOT a complete installation instruction. -
Page 6: Installation Considerations
INSTALLATION CONSIDERATIONS INSTALLATION CONSIDERATIONS Installation information given in this Service Manual IS NOT a complete installation instruction. Installation information covered in this Service Manual has a limited focus as it applies to servicing. This Service Manual does not replace or supersede the Instruction Manual that came with the water heater. -
Page 7: Electrical Requirements
INSTALLATION CONSIDERATIONS ELECTRICAL REQUIREMENTS Grounding Review the electrical ground requirements given in the Instruction Manual that came with the water heater and ensure the water heater has been properly grounded. The water heater must be grounded in accordance with the National Electric Code and/or local codes. -
Page 8: Pre Service Checks
PRE SERVICE CHECKS PRE SERVICE CHECKS WIRING CONNECTIONS With the power supply to the water heater turned off ensure the wiring connections are properly tightened to all components including: high voltage terminal blocks, fuse blocks, contactors and transformers. Loose connections at any connection point will cause increased amperage and excessive heat which can damage wiring and components. -
Page 9: Water Heater Construction
WATER HEATER CONSTRUCTION WATER HEATER CONSTRUCTION Electronic Controls The water heaters covered in this Service Manual are equipped with an electronic control system - see page 56. The control system senses temperature electrically from an Immersion Temperature Probe. The probe is installed in a threaded opening in the storage tank (wet well) and senses water temperature directly. -
Page 10: 5 - 20 Gallon Models
WATER HEATER CONSTRUCTION 5 - 20 GALLON MODELS Figure 1 Servicing should only be performed by a Qualified Service Agent... -
Page 11: Gallon Models
WATER HEATER CONSTRUCTION 30 - 120 GALLON MODELS Figure 2 Servicing should only be performed by a Qualified Service Agent... -
Page 12: Operation & Service
OPERATION & SERVICE OPERATION & SERVICE This section of the manual will cover principles of electricity, single and three phase power, fuses, heating element construction & operation, heating element sensors, contactors, common service procedures and more. Information and service procedures presented in this section will be referenced in the troubleshooting sections at the end of this manual. - Page 13 OPERATION & SERVICE Ohms Law A law that explains the relationship between voltage, current and resistance. The law states that the electric current flowing through a conductor is equal to the voltage divided by the resistance. The following equations further explain ohms law. V = Volts (electrical pressure) A = Amps...
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Page 14: Single And Three Phase Power
OPERATION & SERVICE SINGLE AND THREE PHASE POWER These water heaters can be factory ordered for standard: 277/208/240/480 volt power. 277 volt models are single phase only - other voltages may be single or three phase. Field Conversions Some water heaters may be converted for single or three phase power within the guidelines listed below. -
Page 15: Checking Single Phase Power
OPERATION & SERVICE Checking Single Phase (1Ø) Power A single phase power supply will be connected to the L1 and L2 terminals of the Power Distribution Block or directly to the contactor on models equipped with a single element. On 208/240/480 volt power supplies both wires are “hot”... -
Page 16: Checking Three Phase Power
OPERATION & SERVICE Checking Three Phase (3Ø) Power A three phase power supply will be connected to the L1, L2 and L3 terminals of the Power Distribution Block or directly to the contactor on models equipped with a single element. All three wires are “hot”... -
Page 17: Fuses
OPERATION & SERVICE FUSES Depending on total amp draw and how they were ordered some water heaters will be equipped with power circuit fuses to protect the heating element circuits. All models will have two fuses to protect the primary winding of the 120 Volt Control Circuit Transformer. See Figures 1 and 2 on pages 8 and 9 for location. -
Page 18: Heating Elements
OPERATION & SERVICE HEATING ELEMENTS Heating Element Construction The water heaters covered in this manual use electric heating elements to heat water. Heating elements convert electrical energy into heat energy. Heating elements are constructed using 3 tubes formed into U shaped loops. The two ends of each loop are permanently fitted into the element flange. -
Page 19: Six And Three Wire Heating Elements
OPERATION & SERVICE Heating Element Wiring This section will provide more detailed information on heating elements and how they are wired in single phase, three phase Delta and three phase Y configurations. See “Single And Three Phase Power” on page 12. Six and Three Wire Heating Elements Depending on how a water heater is ordered and factory configured it will be equipped with heating elements that have six wiring leads or three wiring leads. -
Page 20: Single Phase Element Wiring
OPERATION & SERVICE Single Phase Wiring - 3 Pole Contactor The illustrations below show how six wire heating elements (page 17) are wired to 3 pole contactors on water heaters connected to a single phase power supply. See the “Contactors” section of this manual - pages 34 - 38. Connection Diagram Wiring Diagram Single phase (1Ø) - Page 21 OPERATION & SERVICE Single Phase Wiring - 4 Pole Contactor The illustrations below show how six wire heating elements (page 17) are wired to 4 pole contactors on water heaters connected to a single phase power supply. See the “Contactors” section of this manual - pages 34 - 38. Connection Diagram Wiring Diagram Models configured for...
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Page 22: Three Phase Element Wiring
OPERATION & SERVICE Three Phase Delta Wiring - 3 Pole Contactor The illustrations below show how six wire heating elements (page 17) are wired to 3 pole contactors on water heaters connected to a three phase power supply. See the “Contactors” section of this manual - pages 34 - 38. - Page 23 OPERATION & SERVICE Three Phase Delta Wiring - 4 Pole Contactor The illustrations below show how six wire heating elements (page 17) are wired to 4 pole contactors on water heaters connected to a three phase power supply. See the “Contactors” section of this manual - pages 34 - 38.
- Page 24 OPERATION & SERVICE Three Phase Y Configuration - 3 Pole Contactor The illustrations below show how three wire (Y configured) heating elements (page 17) are wired to 3 pole contactors on water heaters connected to a three phase power supply. See the “Contactors”...
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Page 25: Heating Element Ratings & Configurations
OPERATION & SERVICE Heating Element Ratings There are six “standard” heating element KW ratings used; 3, 6, 9, Heating Element Flange 12, 15 and 18KW. Heating element flanges are stamped with the part number, voltage and KW rating - see the illustration to the right. Heating Element Configurations The table below shows standard heating element configurations used. -
Page 26: Heating Element Amperage Tables
OPERATION & SERVICE Heating Element Amperage - Six Wire Elements The table below shows the approximate amp draw through each loop (see page 17) of a six wire heating element. First determine the actual rated wattage and voltage of the element being tested - see page 23. -
Page 27: Heating Element Amperage Test
OPERATION & SERVICE Heating Element Amperage Test This test should be considered as a first diagnostic procedure for the common service complaints of no hot water or not enough hot water. The heating element amperage test shown on this page is the best procedure to quickly determine which (if any) heating elements are not working properly. -
Page 28: Heating Element Voltage Test
OPERATION & SERVICE Heating Element Voltage Test This test is typically performed after an amperage test (page 25) has determined one or more heating elements (or heating element loops) is not drawing the correct amperage. There are five standard element/contactor wiring configurations for the water heaters covered by this manual - see pages 18 - 22. - Page 29 OPERATION & SERVICE Heating Element Voltage Test (cont) A Single Phase Power - 3 Pole Contactor - Six Wire Element (see diagrams page 18): 1 Measure and record voltage to all three heating element loops between the first and third lower terminals of the contactor - L1 &...
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Page 30: Heating Element Resistance Tables
OPERATION & SERVICE Heating Element Resistance - Six Wire Elements This table shows the approximate resistance (in ohms) of each loop (see page 17) in a six wire heating element. First determine the actual rated wattage and voltage of the element being tested - see page 23. -
Page 31: Heating Element Resistance Test
OPERATION & SERVICE Heating Element Resistance & Ground Tests This is a two part test. In the first test the actual resistance (ohms) of each heating element loop is measured. In the second part of this test each heating element loop is tested for any continuity to ground to ensure the heating element is not shorted to ground. -
Page 32: Heating Element Ground Test
OPERATION & SERVICE Heating Element Ground Test Secure power to the water heater at the main breaker or disconnect switch. Verify with an AC volt meter that there is not any voltage present at the Power Distribution Block (see Figure 2 on page 9) or the contactor on single element models. Disconnect and label the power wires from the contactor(s) to all elements being tested. -
Page 33: Replacing Heating Elements
OPERATION & SERVICE Replacing Heating Elements Secure power to the water heater at the main breaker or disconnect switch. Verify with an AC volt meter that there is not any voltage present at the Power Distribution Block and contactors inside the water heater - see Figures 1 and 2 on pages 8 and 9 for location and pages 12 - 14 for power supply test procedures. -
Page 34: Heating Element Sensors
OPERATION & SERVICE ELEMENT SENSORS The water heaters covered in this manual monitor heating elements using Element Sensors. Each Element Sensor monitors all the three loops of a heating element - see pages 16 & 17. There will be one Element Sensor for each heating element. IE: water heaters equipped with 5 heating elements will have 5 Element Sensors. -
Page 35: Element Sensor Operation
OPERATION & SERVICE Element Sensor Operation When current (amperage) flows through a wire in an electrical circuit a magnetic field is developed that radiates out from the wire. The individual current sensors detect this magnetic field. When current flows in a wire routed through the hole in one of the individual current sensors, the sensor is activated and sends a signal back to the CCB confirming the presence of current. -
Page 36: Contactors
OPERATION & SERVICE CONTACTORS This section of the manual provides information on how contactors are constructed, how they work and how to test contactor operation - see pages 8 & 9 for location. Contactor Construction - How They Work Magnetic contactors are used to energize and de-energize the heating elements. The water heaters covered in this manual are equipped with either 3 pole or 4 pole contactors the illustrations below show a 3 pole contactor - see Contactor Configurations on page 35 to view 4 pole contactor illustrations. -
Page 37: Contactor Configurations
OPERATION & SERVICE Contactor Configurations Depending on how the water heater was configured in the factory there will be two types of contactors used; 3 pole and 4 pole contactors. The illustrations below show the five standard contactor configurations. There are more detailed heating element connection/wiring diagrams for these standard configurations on pages 18 - 22. -
Page 38: Contactor Inspection
OPERATION & SERVICE Contactor Inspection A thorough visual inspection of the contactors should be performed as part of any regular maintenance program and whenever the water heater is being serviced. Refer to the listed Steps and images below for this procedure. Secure power to the water heater at the main breaker or disconnect switch. -
Page 39: Contactor Coil Voltage - At Contactor
OPERATION & SERVICE Contactor Coil Voltage Test - At Contactor This test procedure will measure contactor coil voltage at the contactor. Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. Adjust the temperature settings to ensure a call for heat is active for all heating elements. Raise the Operating Set Point to 140°F or higher. -
Page 40: Contactor Coil Voltage - At Ccb
OPERATION & SERVICE Contactor Coil Voltage Test - At CCB This test procedure will measure contactor coil voltage where it originates at the J4 & J17 wiring terminals on the CCB. See page 50 for the CCB’s J4 wiring terminal location. Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. -
Page 41: Transformers
OPERATION & SERVICE TRANSFORMERS This section of the manual provides information on how to check wiring and test the multiple tap 120 VAC Control Circuit Transformer and the 24 VAC transformer - see Figures 1 and 2 on pages 8 & 9 for location of the transformers. Service Note: There are two different 120 VAC transformers used on the water heaters covered in this manual. - Page 42 OPERATION & SERVICE 120 VAC Transformer Wiring - 480 Volt Models This is a multiple or “multi” tap transformer that can accept 2 different input voltages to it’s primary winding. This transformer outputs 120 VAC power from it’s secondary winding which powers the CCB (page 50) and the contactor coils.
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Page 43: Vac Control Circuit Transformer Test
OPERATION & SERVICE 120 VAC Control Circuit Transformer Test Ensure the main breaker or disconnect switch is turned on. Verify with an AC volt meter that proper voltage is present at the Power Distribution Block or the contactor on single element models (see Figures 1 and 2 on pages 8 & 9 and pages 12 - 14). Check Primary Winding Voltage: Using an AC volt meter;... -
Page 44: 24 Vac Transformer Test
OPERATION & SERVICE 24 VAC Transformer Test Ensure the main breaker or disconnect switch is turned on. Verify with an AC volt meter that proper voltage is present at the Power Distribution Block or the contactor on single element models (see Figures 1 and 2 on pages 8 & 9 and pages 12 - 14). Check Primary Winding Voltage: Using an AC volt meter;... -
Page 45: Immersion Temperature Probe
OPERATION & SERVICE IMMERSION TEMPERATURE PROBE This section of the manual provides Immersion Temperature Probe information on how test the Immersion Temperature Probe - see Figures 1 & 2 on pages 8 & 9 for location. The Immersion Temperature Probe contains the ECO (energy cut out) and a Temperature Sensor. -
Page 46: Temperature Sensor Resistance Test
OPERATION & SERVICE Temperature Sensor Resistance Test Secure power to the water heater at the main breaker or disconnect switch. Unplug the J5 plug from the CCB - see page 50 for location. Using an ohm meter: set the ohm meter range to a scale above 30,000 ohms initially. Touch the ohm meter probes between the two middle pins (black wires) of the J5 plug end as shown in the image below. -
Page 47: Temperature Sensor Dc Voltage Test
OPERATION & SERVICE Temperature Sensor DC Voltage Test Ensure the main breaker or disconnect switch is turned on. Verify the CCB has the correct input voltage at the J2 socket and is properly grounded - perform the “Checking Power and Ground To The CCB” tests on page 54. Unplug the J5 plug from the CCB (note: the control system will lock out and display “Temp Probe Open”... -
Page 48: Eco Voltage Test
OPERATION & SERVICE ECO Voltage Test Ensure the main breaker or disconnect switch is turned on. Verify the CCB has the correct input voltage at the J2 socket and is properly grounded - perform the Checking Power and Ground To The CCB tests on page 54. Using an AC volt meter;... -
Page 49: Lwco (Low Water Cut Off)
OPERATION & SERVICE LWCO - LOW WATER CUT OFF The water heaters covered in this manual are equipped with a LWCO (low water cut off) safety device. The control system monitors a LWCO probe (see the images below) constantly to ensure the water level inside the water heater remains at or above the level where the probe is installed. -
Page 50: Powered Anode Rod
OPERATION & SERVICE POWERED ANODE ROD All of the water heaters covered in this manual are equipped with a standard anode rod. Some of the water heaters covered in this manual are also equipped with a powered anode rod. See pages 8 & 9 for location. Both types of anode rods are designed to reduce tank corrosion (rusting) that naturally occurs when water comes into contact with steel. -
Page 51: Electronic Controls
OPERATION & SERVICE ELECTRONIC CONTROLS Introduction This section of the manual covers the electronic controls. The control system includes a CCB (Central Control Board), a UIM (User Interface Module) and a Button Pad Overlay. The control system constantly monitors and safely controls heating elements, water temperature and other functions of the water heater. -
Page 52: Ccb - Central Control Board
OPERATION & SERVICE CCB - Central Control Board Servicing should only be performed by a Qualified Service Agent... -
Page 53: Ccb Socket & Wiring Terminal Identification
OPERATION & SERVICE CCB Socket & Wiring Terminal Identification Refer to the illustration on page 50 for physical location of the sockets and wiring terminals. J1 Socket - Transformer PIN # DESCRIPTION 120 VAC hot to transformer Not used 120 VAC neutral to transformer 24 VAC out from transformer 24 VAC out from transformer J2 Socket - 120 VAC Power Supply... - Page 54 OPERATION & SERVICE J7 Socket - Enable / Disable Circuits 1 & 2 (see pages 53 & 63) PIN # DESCRIPTION Enable/Disable circuit 1 Enable/Disable circuit 1 Enable/Disable circuit 2 Enable/Disable circuit 2 J9 Socket - Not Used J10 Socket - LWCO & Powered Anode Rod DESCRIPTION PIN # Not Used...
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Page 55: Ccb Enable Disable Circuit(S) Test
OPERATION & SERVICE CCB Enable/Disable Circuit(s) Test The electronic control system includes two enable/disable circuits (see page 63) for use with field installed supervisory controls such as building EMS (Energy Management System). These two circuits are located at the CCB’s four pin J7 Socket. Both of these Enable/Disable circuits must be closed to enable heating operation. -
Page 56: Checking Power And Ground To The Ccb
OPERATION & SERVICE Checking Power and Ground To The CCB The CCB is powered by the120 VAC Control Circuit Transformer (see pages 39 - 41) at the J2 Socket, pins 1 & 3 (see page 50). This procedure is performed to ensure the 120 VAC power is being supplied to the CCB. -
Page 57: Uim - User Interface Module
OPERATION & SERVICE UIM - User Interface Module The UIM’s major components include a Circuit Board with LCD display and a Button Pad Overlay which contains the five user input buttons. Service Note: The Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must be plugged in exactly as shown in the images below;... -
Page 58: Electronic Control System
ELECTRONIC CONTROL SYSTEM ELECTRONIC CONTROL SYSTEM HEATING ELEMENT OPERATION Depending on tank size and how they were ordered from the factory the water heaters covered in this manual may be equipped with 1 to 5 electric heating elements. See Heating Element Construction on page 16. The illustration here shows how the heating elements are numbered and initially cycled on by the control system - top to bottom. -
Page 59: Control System Features
ELECTRONIC CONTROL SYSTEM CONTROL SYSTEM FEATURES Advanced Diagnostics Plain English text and animated icons display detailed operational and diagnostic information. LCD screen on the front of the water heater displays the Sequence of Operation in real time. Fault or Alert messages are displayed when operational problems occur - see pages 76 - 80. -
Page 60: The Desktop Screen
ELECTRONIC CONTROL SYSTEM THE DESKTOP SCREEN The illustration below shows the control system “Desktop Screen.” This is the default screen. If there are no active Fault or Alert conditions and no user input for approximately 10 minutes the control system will return to this screen automatically. Model Information: Model information and menu titles are shown in the black bar at the top of the Desktop Screen. -
Page 61: Status Icons
ELECTRONIC CONTROL SYSTEM Table 1 Status Icons ICON DESCRIPTION Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the immersion Temperature Probe. -
Page 62: Operating States
ELECTRONIC CONTROL SYSTEM Table 2 - Operating States STATE DESCRIPTION Standby The water heater is not in an active heating cycle. This usually indicates the temperature in the tank has reached the Operating Set Point and the control system has terminated the heating cycle. Heating The control system is in the Heating Mode. -
Page 63: Temperatures Menu
ELECTRONIC CONTROL SYSTEM TEMPERATURES MENU Operating Set Point User adjustable setting 90°F to 190°F range; factory default is 120°F. When the water temperature sensed by the control system from the immersion Temperature Probe reaches the Operating Set Point the control system will end the heating cycle. -
Page 64: Temperature Settings
ELECTRONIC CONTROL SYSTEM Temperature Settings The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu. The following instructions explain how to adjust these user settings and navigate the control system menus. ACTION DISPLAY From the Desktop Screen, press the Operational Button underneath “MENU”... -
Page 65: Heater Status Menu
ELECTRONIC CONTROL SYSTEM HEATER STATUS MENU This menu displays non adjustable operational information. Use the Up & Down Buttons to navigate to the bottom and top of this menu. Status Top Of Menu Displays the current Operating State of the control system. -
Page 66: Economy Mode Setup Menu
ELECTRONIC CONTROL SYSTEM ECONOMY MODE SETUP MENU This menu contains settings used to establish an “Economy Set Point” and “Economy Mode” operating periods. This control system feature can help reduce operating costs during unoccupied or low demand periods. Setpoint Adjustment Desktop Screen During Economy Mode Adjustable user setting (2°F to 50°F - factory default is 20°F) the control system uses to... -
Page 67: Setpoint Adjustment Value
ELECTRONIC CONTROL SYSTEM Economy Mode Settings Setpoint Adjustment Value ACTION DISPLAY From the Desktop screen, press the Operational Button underneath “MENU” to enter the Main Menu. (see UIM Navigation on page 57) Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens. -
Page 68: Time Clock Settings
ELECTRONIC CONTROL SYSTEM Economy Mode Settings Time Clock Settings ACTION DISPLAY From the Desktop Screen navigate to the Economy Mode Setup menu - see page 65 for instructions. Use the Up/Down buttons to select (highlight in black) Current Time sub menu. Press the Operational Button underneath “CHANGE”... -
Page 69: Daily Operating Mode Settings
ELECTRONIC CONTROL SYSTEM Economy Mode Settings Daily Operating Mode Settings ACTION DISPLAY Economy Mode All Day: From the Economy Mode Setup menu use the Up/Down buttons to select (highlight in black) the Daily sub menu for “Sun.” Press the Operational Button underneath “CHANGE”... -
Page 70: Alarm Output Setup Menu
ELECTRONIC CONTROL SYSTEM ALARM OUTPUT SETUP MENU Permits user to set the condition (from a list of options) for when the CCB’s integral alarm output relay will be energized. Alarm relay connections (common, normally open, normally closed) are located on the J3 terminal strip on the CCB (see page 50). Alarm output relay contacts are capable of switching 1 amp maximum at 120 VAC. -
Page 71: Display Settings Menu
ELECTRONIC CONTROL SYSTEM DISPLAY SETTINGS MENU Permits user to set display options for viewing information on the UIM’s LCD screen. Temperature Units Adjustable user setting that changes temperature units display to Celsius °C or Fahrenheit °F. Backlight Delay Adjustable user setting that determines how long the UIM’s LCD backlight remains illuminated after a key has been pressed. -
Page 72: Heater Information Menu
ELECTRONIC CONTROL SYSTEM HEATER INFORMATION MENU This menu displays non adjustable operational information. Elapsed Time Top Of Menu Total accumulated time the control system (water heater) has been energized. Total Heating Time Total accumulated time the control system has been in the heating mode. IE: any heating element(s) has been energized. -
Page 73: Current Fault/Alert Menu
ELECTRONIC CONTROL SYSTEM CURRENT FAULT / ALERT MENU This menu displays non adjustable Main Menu - Current Fault Selected operational information. With the Fault History sub menu selected in Main Menu; press the Operational Button underneath “SELECT” to display the current Fault or Alert message. If there is not a Fault or Alert condition currently active “(none)”... -
Page 74: Restore Factory Defaults Menu
ELECTRONIC CONTROL SYSTEM RESTORE FACTORY DEFAULTS MENU This control system menu allows the user to restore most of the control system’s user settings to their factory default settings. User settings in the Alarm Output Setup and Display Settings menus are unaffected by executing Restore Factory Defaults. Restore Factory Defaults ACTION DISPLAY... -
Page 75: Troubleshooting
TROUBLESHOOTING TROUBLESHOOTING COMMON SERVICE PROBLEMS No Hot Water Hot water supply valve to fixtures turned off; cold water supply valve to water heater turned off. Check power to the water heater - see pages 12 - 14. Check Operating Set Point and Differential Set Points - see pages 61 & 62. Check all fuses - see page 15. -
Page 76: Control System Diagnostics
TROUBLESHOOTING CONTROL SYSTEM DIAGNOSTICS Fault Conditions When the control system declares a Fault condition it will display a Fault message on the UIM and lock out. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation. Alert Conditions When the control system declares an Alert condition it will continue heating but will display an Alert message on the UIM notifying the user that the water heater requires servicing. -
Page 77: Uim Is Inoperable
TROUBLESHOOTING Control System Unresponsive (cont) DISPLAYED MESSAGE CHECK/REPAIR CONDITION/INDICATES • Ensure Ribbon Cable from the Button overlay is UIM is Inoperable inserted correctly in UIM J3 Socket (page 55). UIM does not respond to any user input using the • Call the technical support phone number on the operational and/or Up and Down buttons. -
Page 78: Fault & Alert Messages
TROUBLESHOOTING FAULT AND ALERT MESSAGES Troubleshooting procedures for the most common Fault and Alert messages are covered in this section. In the tables that follow the first column shows the Fault or Alert message as displayed by the UIM along with an explanation. The second column details things to check or repair and references test procedures detailed in the Operation and Service section (pages 10 - 55) of this manual. -
Page 79: Temp Probe Open
TROUBLESHOOTING Fault & Alert Messages DISPLAYED MESSAGE CHECK/REPAIR CONDITION/INDICATES • Check the J5 plug/socket connections at the “Temp Probe Open” CCB ensure they are mating properly and pro- (Fault Condition) viding good contact. Check the pins inside the J5 plug/socket for wear or damage. See CCB The control system has detected an open circuit illustration and socket identification on pages 50 from the temperature sensor. -
Page 80: Energy Cut Out (Eco)
TROUBLESHOOTING Fault & Alert Messages DISPLAYED MESSAGE CHECK/REPAIR CONDITION/INDICATES • Check the J5 plug/socket connection at the “Energy Cut Out (ECO)” CCB ensure they are mating properly and pro- (Fault Condition) viding good contact. Check the pins inside the J5 plug/socket for wear or damage. See CCB The control system has detected excessive water illustration and socket identification on pages 50 temperature inside the water heater. -
Page 81: Lwco Fault
TROUBLESHOOTING Fault & Alert Messages DISPLAYED MESSAGE CHECK/REPAIR CONDITION/INDICATES • Ensure the water heater is full of water. Follow “LWCO Fault” the filling instructions in the maintenance sec- (Fault Condition) tion of Instruction Manual that came with the water heater. The control system has detected a low water condition in the water heater’s storage tank - see •... -
Page 82: No Anode Current
TROUBLESHOOTING Fault & Alert Messages DISPLAYED MESSAGE CHECK/REPAIR CONDITION/INDICATES • Ensure the water heater is full of water. Follow “No Anode Current” the filling instructions in the maintenance sec- “Low Anode Protection” tion of Instruction Manual that came with the “No Anode Voltage”... - Page 84 500 Tennessee Waltz Parkway, Ashland City, TN 37015 Technical Support and Parts: 800-365-0577 www.statewaterheaters.com...
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