SD3 Series - GENERAL GENERAL • Low water protection. INTRODUCTION • One incoming plumbing connection to dishwasher through an electrically operated This manual is applicable to the models and ML valve. numbers listed on the cover page. Procedures apply to all models unless specified otherwise.
SD3 Series - GENERAL WATER SUPPLY REQUIREMENTS Hardness Temperature Flowing Model Chlorides ppm Water Usage (minimum) Pressure grains/gal. Water hardness below 4 grains/gal requires water treatment to reduce potential corrosion. Hardness above 6 grains/gal should be treated by water conditioner, water softener or in-line treatment.
SD3 Series - GENERAL The control board is programed to cause the booster the default settings. Refer to SERVICE heater to turn on at the beginning of every rinse cycle PROGRAMMING for procedures on altering the pre- and turn off at the end of the cycle. This occurs even programmed times of cycle one.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS CONTROL BOARD PROGRAMMING Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS CONTROL BOARD PROGRAMMING Feature Description Display Setting Display Standard Not Applicable in SD3 Not Applicable in SD3 Machine Type Not Applicable in SD3 Not Applicable in SD3 Not Applicable in SD3 Hot SD3 with Booster...
Page 8
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS NOTE: Service programming mode can be accessed by two methods. Entering Programming Mode When Machine is OFF Remove front cover. Open control door. Press and hold the PROG switch on the control board, then press the ON key on the switch membrane keypad (user controls on front of machine) to enter programming mode.
Page 9
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROGRAMMING CHART DISPLAY PROGRAMMING PARAMETER DEFAULT VARIABLES ICONS NUMERIC VALUE Chemical Models: 130°F 120-150°F Programmed Tank Temperature Temperature Hot Models: 150-170°F 158°F WASH Plain Models: 150-170°F 158°F Booster Temperature (Hot Programmed 180 - 195°F (Hot Models 186°F...
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS TANK HEATER - TEST Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures. If test points are not easily...
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS BOOSTER HEATER - TEST Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures. If test points are not easily...
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS INDIVIDUAL ELEMENT RESISTANCE THERMISTOR - TEST 1QTM, 2QTM Voltage Cold Resistance & 3QTM 575 - 600V 75.3 - 87.0Ω PUMP MOTOR - TEST Certain procedures in this section require electrical test or measurements while power is applied to the machine.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS Connect power to machine. Verify incoming AC line voltage at the line service connection point. Verify incoming voltage is present to primary side of transformer 1T. Measure output AC voltage across secondary windings of transformer. Voltage should be approximately 120VAC.
SD3 Series - SERVICE PROCEDURES AND ADJUSTMENTS If voltage at output is still low, Lock adjusting nut in position with lower nut. replace transformer. If voltage at output is between 11.5 - 16VAC, check the control board assembly. DELIMIMG PROCEDURE...
SD3 Series - ELECTRICAL OPERATION Terminal Block Line service to booster contactor 3CON (1 phase only). (2TB) ....Terminal Block Connection point for detergent and rinse aid control devices.
SD3 Series - ELECTRICAL OPERATION Relay Board NOTE: DETERGENT AND RINSE AID CIRCUITS Machine is off. Display is not lit. NOT USED ON SD3. Line voltage present at the following components. SEQUENCE OF OPERATION Primary windings of transformer 1T. Refer to the correct wiring diagram for model being Line sides of 1CON (pump motor) and serviced when reviewing sequence of operation.
Page 20
SD3 Series - ELECTRICAL OPERATION Relay board relays K5-C, K8-C and K9- BOOSTER LED on relay board C thru fuse F2. turns on. NOTE: It is normal for the secondary voltage (output) Control board signals relay board from transformer 2T to range between 11.5 to 16VAC.
SD3 Series - ELECTRICAL OPERATION WASH LED on relay board turns Rinse cycle completed. off. Control board enters seven second Dishwasher enters a dwell cycle. sani-dwell. RINSE icon is displayed Default is two seconds. until sani-dwell cycle is complete. Machine line voltage removed from Control board de-energizes the rinse terminals DPS1 and DPS2.
Page 22
SD3 Series - ELECTRICAL OPERATION RELAY BOARD LEDs RELAY BOARD DESCRIPTION DETERGENT LEDs present on service replacement relay boards, but not used on SD3 machines. SANITIZER F45576 (1015) Page 22 of 37...
SD3 Series - TROUBLESHOOTING TROUBLESHOOTING QUICK REFERENCE CHART - ELECTRIC HEAT ELECTRIC HEAT CHART Component Under Test Point Measure Test Primary H1 & H2 208V Line Service Primary H1 & H3 240V Line Service Transformer - 1T Primary H1 & H4 480V Line Service Secondary X1 &...
Page 26
SD3 Series - TROUBLESHOOTING ELECTRIC HEAT CHART Component Under Test Point Measure Test J3-2 (Display) 12VDC (machine on) J3-1 (Display) 5VDC (machine on) J4-4 (Keypad) 5VDC (machine off only) J4-3 (Keypad) 5VDC (machine on) J4-2 (Keypad) 5VDC (machine on) J6-1 5VDC (machine on) J6-6 ®.
SD3 Series - TROUBLESHOOTING CONTROL BOARD AND RELAY BOARD On dishwashers equipped with the optional booster, the heat circuit is enabled when tank float switch is closed. Do not operate machine with dishwasher tank full of water and booster tank empty.
SD3 Series - TROUBLESHOOTING If voltage is not present, remove If 12VDC is missing, ribbon cable connector and check disconnect the display board for 5VDC on pin J4-4. If not ribbon cable from the control present replace control board. board. Recheck. If 12VDC is...
SD3 Series - TROUBLESHOOTING If voltage measurements indicate circuit is active, verify wiring to relay board is correct. If correct, replace relay board. If voltage measurements are not present, replace control board. If voltage measurements remain constant at approximately 4.5VDC, check the door interlock circuit 1LS.
SD3 Series - TROUBLESHOOTING Verify no debris is present in tank that could cause float to malfunction. If no debris is interfering with float operation, control board has malfunctioned. No Wash Cycle Verify the following. OPERATING CONDITIONS are satisfied as stated at the beginning of this section.
SD3 Series - TROUBLESHOOTING MICRO LED is flashing at a rate of 1 sec on, SERVICE DIAGNOSTICS 1 sec off, and the DOOR and LOW WATER LEVEL LEDs on control board are on. Certain procedures in this section Shorting J8 terminals together without...
SD3 Series - TROUBLESHOOTING ERROR CODES (IN SERVICE DIAGNOSTICS SCREEN) Left Digit (1) Right Digit (1) Description of Error Normal operation. No recorded errors. Slow Leak. Booster set point timeout (480 sec. after initial fill). Control board E-prom error. Water not to float on initial fill.
SD3 Series - TROUBLESHOOTING TEST ACTIVE KEY KEY RESPONSE DISPLAY DATA ▲ (arrow) Step through icons See example of cycle count below table. M = million ADD icon = 00 - 99 x 1M DETERGENT icon = 00 - 99 x...
SD3 Series - TROUBLESHOOTING NOTE: When troubleshooting, always check for AP (plain - external booster). correct voltage, current, and resistance as specified AH (hot - self-contained booster). by the machine's data plate. Before troubleshooting machine, verify that the control board assembly is If machine type programmed into control board is programmed to operate as an SD3.
SD3 Series - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES No power to machine. Fuse blown or circuit breaker tripped. Fuse F2 on relay board open. Missing 120VAC from 1T. No display Missing 11.5-16VAC from 2T to control board J1 1&3. Display board unplugged from control board or display board malfunction.
SD3 Series - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES Fuse F1 on relay board open. Relay 1CR malfunction. External wiring to rinse device issue. Rinse aid pump not energizing. Rinse aid pump (supplied by others) malfunction Relay board malfunction Control board malfunction High limit thermostat switch malfunction Booster temperature setting on control board too high.
Page 38
CATALOG OF REPLACEMENT PARTS SD3 DISHWASHER ML-130232 A product of T h e S t e r o C o m p a n y 1 7 5 8 C o r p o r a t e C i r c l e P e t a l u m a , C A 9 5 4 7 6 FORM 43302 (October 2015)
Page 40
SD3 DISHWASHER REPLACEMENT PARTS Table of Contents CONTROLS CONTROL CABLES CONTROL BOX MOTOR AND PUMP UPPER WASH ARM LOWER WASH ARM RINSE PIPING (WITHOUT BOOSTER) RINSE PIPING (WITH BOOSTER) BOOSTER PIPING ELECTRIC BOOSTER TANK LOW WATER PROTECTION AND ELECTRIC HEAT DRAIN UNIT DRAIN WATER TEMPERING (OPTIONAL ACCESSORY) DOOR ASSEMBLY...
SD3 DISHWASHER REPLACEMENT PARTS CONTROL BOX F-43302 Rev. B (October 2015) - 8 -...
Page 46
SD3 DISHWASHER REPLACEMENT PARTS CONTROL BOX ILLUS. PART NO. NAME OF PART AMT. PL-60514 0P-678161 Self-Tapping Screw 10-16 x 1/2 Phil. Pan Hd., Type B..............3 0A-108203 Clamp - Wire (1 I.D.)........................3 0P-668314 Bushing - Electrical Snap......................3 0P-678161 Self-Tapping Screw 10-16 x 1/2 Phil. Pan Hd., Type B..............2 0P-678352 Lockwasher #10 External Shakeproof (SST)................2 0P-538200...
SD3 DISHWASHER REPLACEMENT PARTS UPPER WASH ARM F-43302 Rev. B (October 2015) - 12 -...
Page 50
SD3 DISHWASHER REPLACEMENT PARTS UPPER WASH ARM ILLUS. PART NO. NAME OF PART AMT. PL-AI3993 0P-678346 Cap Screw 5/16-18 x 3/8 Hex Hd....................2 0P-578176 O-Ring............................1 0B-108308 Wash Manifold Assy. (Upper).....................1 0P-578179 O-Ring............................1 0P-678343 Set Screw 10-24 x 1/4 Hex Hdls., Cup Pt. (SST)...............2 0B-108298 Hub - Wash Arm.........................1 0A-108221...
SD3 DISHWASHER REPLACEMENT PARTS LOWER WASH ARM F-43302 Rev. B (October 2015) - 14 -...
Page 52
SD3 DISHWASHER REPLACEMENT PARTS LOWER WASH ARM ILLUS. PART NO. NAME OF PART AMT. PL-AI3998 0P-678343 Set Screw 10-24 x 1/4 Hex Hdls., Cup Pt. (SST)...............2 0A-108245 Arm - Rinse (Incls. Items 3 & 4)....................1 0A-108246 Plug - Rinse Arm........................2 0P-668243 Bearing............................1 0P-578178...
SD3 DISHWASHER REPLACEMENT PARTS BOOSTER PIPING F-43302 Rev. B (October 2015) - 20 -...
Page 58
SD3 DISHWASHER REPLACEMENT PARTS BOOSTER PIPING ILLUS. PART NO. NAME OF PART AMT. PL-60520 0P-688325 Pipe 1/2 x 7 TBE (Brass)......................1 0P-688317 Elbow - Pipe 1/2 x 90 Deg. (Brass)....................1 0P-688318 Tee - Pipe 1/2 x 1/2 x 1/2 (Brass)....................1 0P-688322 Pipe Plug 1/2 Sq.
SD3 DISHWASHER REPLACEMENT PARTS LOW WATER PROTECTION AND ELECTRIC HEAT F-43302 Rev. B (October 2015) - 24 -...
Page 62
SD3 DISHWASHER REPLACEMENT PARTS LOW WATER PROTECTION AND ELECTRIC HEAT ILLUS. PART NO. NAME OF PART AMT. PL-60522 0P-678333 Nut 3/8-16 (Brass) (Supplied With Heater).................1 0P-678350 Lockwasher 3/8 Helical (SST)....................1 0B-108216 Plate - Electric Heat........................1 0P-578174 O-Ring............................1 0P-558251 Element - Heater Wash Tank (6 kW) (200 V) Element - Heater (6.2 kW) (208 V.)....AR 0P-558249 Element - Heater (5 kW) (200-240 V., 50/60 Hz., 1 &...
SD3 DISHWASHER REPLACEMENT PARTS DOOR ASSEMBLY F-43302 Rev. B (October 2015) - 30 -...
Page 68
SD3 DISHWASHER REPLACEMENT PARTS DOOR ASSEMBLY ILLUS. PART NO. NAME OF PART AMT. PL-AI3997 0P-678169 Washer (SST)..........................2 0A-108091 Spacer - Door Link (Lower)......................2 0P-678169 Washer (SST)..........................2 0P-678142 Stop Nut 5/16-18 Hex (SST)......................2 0A-108097 Link - Door Handle........................2 0P-678150 0P-678150..........................2 0P-678169 Washer (SST)..........................2 0A-108090 Spacer Door Link (Upper)......................2...
Need help?
Do you have a question about the SD3 Series and is the answer not in the manual?
Questions and answers