• Temperature tester (thermocouple type). MODELS COVERED • Field service grounding kit. Special The SU and SG Series dishwashers are fully • Precision Chlorine Test Paper Vial, for testing automatic, front-loading dishwashing machines. sanitizer p.p.m. SU-L 33 racks per hour •...
READY MODE While a cycle is not in process, the SU and SG PRIMING CHEMICAL PUMPS Series will maintain in idle state. In this mode, Chemical pumps prime on Power Up or at the...
SG, SU-L, SU-H DISHWASHERS - GENERAL After the wash cycle ends, water is drained from the sump to allow for the rinse water from the holding tank (cold machines) or booster (hot machines). POWER-DOWN / DRAIN When the POWER key is pressed, the unit will enter a drain cycle.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS CONTROL PANEL SERVICE LEFT AND RIGHT TRIM PANELS POSITION Disconnect the electrical power to the machine and Disconnect the follow lockout / tagout procedures. electrical power to the machine and follow lockout / tagout procedures.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS Left and Right Trim Panel Installation Insert right trim panel notch into right side unit trim panel latch. Fig. 8 Pull out control cover and disconnect switch membrane ribbon cable from connector.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS WATER LEVEL SENSORS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Remove CONTROL PANEL COVER. Remove LEFT AND RIGHT TRIM PANELS Fig. 10 (Booster/Holding Tank) or LEFT AND RIGHT TRIM PANELS (Sump tank).
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS Reverse procedure to install. NOTE: Do NOT use zip ties. Verify there is no water in air trap. NOTE: Do NOT over squeeze clamp. Over squeezing causes leaks. Verify there is no water, kinks or holes in pressure sensor tubing.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS Fig. 17 Twist drain pump clockwise (CW) to remove. Fig. 19 Disconnect electrical connections from valve. Remove mounting bracket screws. Remove fill valve from bracket. Disconnect and drain braided water line.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS Remove fill valve (1SOL) from rinse pump. RINSE PROBE (2QTM) NOTE: Leave electrical connections and hoses connected to fill valve. Fill valve will be transferred to replacement rinse pump. Disconnect the electrical power to the machine and follow lockout / tagout procedures.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS WASH PIPE ASSEMBLY Disconnect the electrical power to the machine and follow lockout / tagout procedures. Remove rinse pump and chemical pump bracket. Remove WASH PUMP/MOTOR (1MTR). Remove upper and lower wash and rinse arms.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS 13. Remove wash pipe assembly. NOTE: If any tubes or wiring are routed between wash pipe and rinse hose, disconnect rinse hose at rinse tee to free tubes/wiring. 14. Transfer rinse hosing to replacement wash pipe.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS 10. Using service tool, remove pump nut. BOOSTER HEATER (SU-H) NOTE: ⅜" drive extension can be used to turn service tool. Disconnect the electrical power to the machine and follow lockout / tagout procedures.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS NOTE: When installing thermistor, verify there is SUMP THERMISTOR & HIGH LIMIT thermal paste on the side of the thermistor that is PROTECTION mounted to the booster. Mount tightly to booster surface and in same position as from the factory.
SG, SU-L, SU-H DISHWASHERS - REMOVAL AND REPLACEMENT OF PARTS NOTE: Make sure gasket is installed between inside wall of tank and air gap. Replace gaskets as necessary. Check for proper operation. DOOR SWITCH NOTE: Door magnet is part of door.
• EDIT PARAMETERS NOTE: The replacement control board comes • VIEW ERROR LOG programmed as an SG, SU-L, and SU-H or other OEM • VIEW STATS machines must be reprogrammed to Stero. • TOGGLE DIAGNOSTICS...
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS EDIT PARAMETERS Cold Units Hot Units Parameter (Stero Cold SU-L) Description Possible Values Default Values Name (Stero Hot SU-H) (Glass Washer: Stero Cold SG) Booster Booster Temp Set Stero Hot SU-H...
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS EDIT PARAMETERS Cold Units Hot Units Parameter (Stero Cold SU-L) Description Possible Values Default Values Name (Stero Hot SU-H) (Glass Washer: Stero Cold SG) Sets maximum allowable Stero Cold SU-L Rinse Aid...
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS VIEW ERROR LOG • Errors are displayed one at a time. • The log will keep the last 10. If the log contains 10 errors when the eleventh error occurs it takes the place of 10.
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS VIEW STATS Hours of operation for various components of the dishwasher. The amount of wash cycles are recorded, since the last delime and how many cycles until the next scheduled delime.
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS TOGGLE DIAGNOSTIC Cold Units Hot Units Parameter (Stero Cold SU-L) Description Possible Values Default Values Name (Stero Hot SU-H) (Glass Washer: Stero Cold SG) Toggle on- Stero Cold SU-L Toggle Diag: (off)
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS IMMEDIATE SHUTDOWN Cold Units Hot Units Parameter (Stero Cold SU-L) Description Name (Stero Hot SU-H) (Glass Washer: Stero Cold When selected, shuts dishwasher down immediately even if in the middle of an...
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS SOAP PROGRAMMING (7627) Service Programming • EDIT PARAMETERS • PRIME PUMPS • EXIT MENU Press MENU button on keypad. Enter SERVICE MENU. Enter Service code 7627. EDIT PARAMETERS Cold Units Hot Units...
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS EDIT PARAMETERS Cold Units Hot Units Parameter (Stero SU-L) Description Possible Values Default Values Name (Stero SU-H) (Stero Glass Washer SG) Sets detection amount. Stero SU-L Sanitizer Sets maximum 500-4000 (by 100's)
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS EXIT MENU Cold Units Hot Units Parameter (Stero SU-L) Description Name (Stero SU-H) (Stero Glass Washer SG) Stero SU-L Exit Menu Stero SU-H Exits menu. Stero SG MANAGER PROGRAMMING (1001) Service Programming •...
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SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS EDIT PARAMETERS Cold Units Hot Units Parameter (Stero SU-L) Possible Default Description Name Values Values (Stero SU-H) (Glass Unit: Stero SG) Enables or disables a visual alert on the display that...
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS PRIME PUMPS Cold Units Hot Units Parameter (Stero SU-L) Description Possible Values Name (Stero SU-H) (Glass Unit: Stero SG) Pump Menu Manual prime for sanitizer pump. Sanitizer Stero SU-L 1100mV If chemical sensor value is below...
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS Repeat procedure until proper reading is obtained. BYPASS WASH/HEAT CYCLES FOR TROUBLESHOOTING NOTE: Must be in Toggle Diagnostics mode to bypass. The Wash and Heat Cycle can be sped up to save time during troubleshooting or servicing.
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS PURGE BOOSTER/HOLDING TANK FOR SERVICE NOTE: Booster or holding tank will still have 1" to 1-1/2" of water inside after purging. If rinse pump operational: Place dishwasher in . Short rinse pump pins (J16) on control board to operate rinse pump.
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS SUMP HEATER TEST BOOSTER HEATER TEST Certain procedures in Certain procedures in this section require electrical test or this section require electrical test or measurements while power is applied measurements while power is applied to the machine.
SG, SU-L, SU-H DISHWASHERS - SERVICE PROCEDURES AND ADJUSTMENTS Test the heater for resistance and compare meter reading to BOOSTER HEATER TEST SPECIFICATIONS. 100K OHM THERMISTOR TEST - RINSE PROBE (2QTM) Determine temperature of water. Disconnect thermistor leads. Determine resistance of thermistor.
NUMBER DESCRIPTION ELECTRICAL CALLOUT Booster Overtemp Thermostat (Hot unit only: SU-H) 3TAS / 4TAS Wash Pump Motor 1MTR Booster Heat Contactor (Hot unit only: SU-L) 1CON Terminal Block (COLD units only: SU-L & SG) Page 35 of 59 F45577 (1215)
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Booster Heater (Hot unit only: SU-H) 2HTR Booster Water Level Air Trap (Hot unit only: SU-H) — Booster Temperature Sensor (Hot unit only: SU-H) 3QTM Booster Water Level Air Trap (COLD units only: SU-L & SG) — Fig. 50 F45577 (1215) Page 36 of 59...
SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION NUMBER DESCRIPTION ELECTRICAL CALLOUT Water level sensors 1PRS / 2PRS Door Switch Sump level air trap Sump heater overtemp thermostat 1TAS / 2TAS Sump heater 1HTR CONTROL BOARD LEDs Place unit in CONTROL PANEL SERVICE POSITION to access control board.
SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION CONTROL BOARD LEDs Designation Function Color Rinse Aid Sensor ON - Chemical Detected Detergent Sensor ON - Chemical Detected Line Monitor Wash Pump ON Sump High Limit ON - Tripped Booster High Limit ON - Tripped...
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SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION CONTROL BOARD TEST POINTS 120 - 240 VAC & VDC SU-L Designation Function SU-H TP1 to Board GND Detergent Pump 11-12VDC 11-12VDC TP2 to Board GND Rinse Aid Pump 11-12VDC 11-12VDC TP3 to Board GND Sanitizer Pump...
SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION JUMPER COMPONENT ACTION DO NOT USE KEYPAD - POWER BUTTON POWER BUTTON KEYPAD - HIDDEN BUTTON HIDDEN BUTTON KEYPAD - UP BUTTON UP BUTTON RESET RESET MICRO DO NOT USE CONTROL BOARD WIRE CONNECTIONS Fig.
SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION 12V Control Not Used Not Used Not Used Wash Pump (Normally Closed) Not Used POWER SUPPLY BOARD LEDs & TEST POINTS Fig. 55 POWER SUPPLY BOARD LEDs Designation Function Color +12VDC ON Green...
NOTE: Machine connected to Supply Voltage - Power Door closed. Button has not been pushed. Water supply at correct temperature and manual NOTE: Use SU-L & SG WIRING DIAGRAM for supply valve is on. sequence. 1TAS and 2TAS closed. Conditions...
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SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION • Item name displayed on error. Steps 2 - 5 repeat until 1PRS senses 840 mV. K11 energized - N.O. contacts close. 1MTR energized for 3 - 10 sec to prime wash arms.
SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION K4 energizes. K4 energizes. D77 turns on. D77 turns on. 1PRS senses 840 mV. At end of 20 sec 3MTR de-energized. 3MTR de-energized. K4 de-energies K4 de-energizes. D77 turns off. D77 turns off.
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SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION 2PRS has a reading of 500 mV or greater - NOTE: If the cycle timer reaches 0 before 2PRS 2MTR is energized for 20 sec senses 500 mV the booster heater and rinse pump will be de-energized.
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SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION Wash cycle time ends 5 sec into fill - READY displayed 1MTR de-energized 2PRS senses 1400 mV K6 de-energizes 1SOL de-energized D69 turns off K3 de-energized Control checks booster temp (3QTM) D76 turns off If below 180°F wash cycle is extended 120...
SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING TROUBLESHOOTING TOGGLE DIAGNOSTICS Toggle diagnostic screen is a useful tool for understanding the operation of the dishwasher. Toggle diagnostic screen allows values from the water level sensors in millivolts and water temperature in °F to be monitored in real time.
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SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING During the repair procedure, power will be removed from the control board. This resets the error codes and allows the machine to be started. Error Display Description After two consecutive low temperatures, if LOW RINSE...
SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING TROUBLESHOOTING GUIDE WARE Symptom Possible Causes Strainers clogged causing inadequate water supply to pump. Obstruction in wash arm(s) or wash arms will not turn. Wash and/or rinse arms will not turn – check that they spin freely.
SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING TROUBLESHOOTING GUIDE MACHINE Symptom Possible Causes Machine OFF. Open fuse or circuit breaker off at power supply. Cord not plugged in (corded models only). L1 fuse F1 open. (120/60/1 and 120/208-240/60/1 and 3) L1 fuse F4 open. (208-240/60/1 and 3) No machine operation (no display).
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SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING Symptom Possible Causes Incorrect line voltage. 1PRS malfunction including pressure sensor tubing and water trap. Sump heater inoperative. Sump not heating. Temperature probe 1QTM open or shorted. High limit 1TAS or 2TAS open. 1CR malfunction.
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SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING Symptom Possible Causes Machine not level. Machine operated without a rack. Door gasket malfunction. Door not adjusted correctly. See DOOR ADJUSTMENT. Machine leaks from door. DRAIN PUMP malfunction. Sump Water Level Sensor 1PRS malfunction.
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SG, SU-L, SU-H DISHWASHERS - TROUBLESHOOTING Symptom Possible Causes Loose Wash Ring in upper wash arm, lower wash arm, or both. Noisy Wash Arm Verify wash arm sealing ring is not warn. Page 59 of 59 F45577 (1215)
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CATALOG OF REPLACEMENT PARTS SG & SU SERIES UNDERCOUNTER DISHWASHERS ML-130273 SU H ML-130274 SU L ML-130259 SG (Cold) ML-130260 SG (Cold) A p r o d u c t o f 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...
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WASH PUMP AND DRAIN RINSE PUMP CHEMICAL PUMPS AND SENSORS OOSTER ASSEM L (HOT) (SU-H) RECO ER TAN ASSEM L (COLD) (SU-L & SG) FILL AIR GAP (SU-H & SU-L) FILL AIR GAP (SG) - 3 - F-43317 (October 2015)
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 4 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P- 7 345 Scre 1 4-20 1 2 P 0A-10 523 e - Co er (Re r) 0P- 7 345 Scre 1 4-20 1 2 P 0A-10 424 e - Lo er (Co tro...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015)
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P- 7 345 Scre 1 4-20 1 2 P 0A-10 430 e - Co er (Re r) 0P- 7 345 Scre 1 4-20 1 2 P 0A-10 424 e - Lo er (Co tro...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015)
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P-45 471 H r e - W re (Te er t re Probe ) 0P- 7 140 Sto N t 10-24 He (SST) 0P- 7 14 Scre 1 4-20 He H (SST)
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 10 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 51 Sto - Door (RH) 0A-10 520 Sto - Door (LH) 0P- 7 570 Set Scre 5 1 -1 3 4 He H Do Pt (SST) 0P- 7 13 N t 5 1 -1 He (SST)
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 12 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 530 Door A 0P- 7 50 Co er - S r 0P- 7 1 5 er 5 1 He c (SST) 0P- 7 570 Set Scre 5 1 -1 3 4 He H...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 14 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P-42 051 0P-42 543 o r - M 0P-52 502 oc - F 0P-52 55 e (0 5 A ) (250 0P-52 5 1 e (2 5 A ) (250 0P-52 557...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 1 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 45 H b - W 0P- 7 573 Se -T Scre 10-1 0A-10 400 0A-10 401 (I c 1 2 & 3) 0 -10 4 e - R e Ar 0P-57 4 7...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 1 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 0 2 - Ho e Ho e - O t et P 0A-10 3 t - R 0A-10 405 T be (SG) 0A-10 405 T be (SU-H & SU-L) 0P- 7 573...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 20 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 547 0P-57 4 5 et - W 0A-10 54 0A-10 544 er - S e e (F e) 0A-10 3 3 - Ho e Tee - C ec Ho e - Dr (SU-H &...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 22 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 3 4 - Ho e Ho e - I et (4 I ) 0A-10 3 4 - Ho e 0A-10 3 4 - Ho e Ho e - O t et (1-3 4 I )
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 24 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P- 5 541 or (C e c ) (Deter e t S t er) 0P- 5 542 or (C e c ) (R e A ) 0P- 7 3 Se -T Scre...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 2 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P- 7 143 Sto N t 1 4-20 He (SST) 0A-10 402 r c et - H 0P- 5 504 Protector - H 0P- 4 43 oo ter 0P-45 471 H r e...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 2 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0P- 7 5 Scre 1 4-20 1 2 He H (SST) 0P- 4 432 oo ter - Reco er 0P- 7 5 2 F tt - T be 1 4 t - T b...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 30 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS Ho e 3 (23 2 I Ho e 3 (15 I 0A-10 3 3 N t - A 0P- 7 4 2 er - A r G 0A-10 54 A r G...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS F-43317 (October 2015) - 32 -...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS 0A-10 53 F - A r A (I c L be ) 0A-10 3 5 Ho e 3 (3 75 I 0A-10 435 ter - C e 0A-10 43 ter - C e...
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SG & SU SERIES UNDERCOUNTER DISHWASHERS REPLACEMENT PARTS FORM 43317 OCTO ER 2015 PRINTED IN U S A...
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Questions and answers
Electrical input
The electrical input specification for the STERO SG dishwasher includes:
- 120 VAC to terminal 1T
- 24 VAC to the Power Supply Board for power-up diagnostics
Additionally, the SUMP and BOOSTER HEATER TEST SPECIFICATIONS list the following:
- 120 V: 10.1–11.8 Amps, 9.6–11.2 Ω
- 208 V: 5.9–6.8 Amps, 28.9–33.5 Ω
- 240 V: 6.8–7.9 Amps
These values should match the machine data plate when calling for heat.
This answer is automatically generated