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20, 2009 REVISED: SEP. 6, 2011 HOSHIZAKI DISHWASHER MODEL JWE-620UA-6B SERVICE MANUAL IMPORTANT Only qualified service technicians should install, service, and maintain the unit. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the equipment in accordance with this manual may adversely affect safety, performance, component life, and warranty coverage. Hoshizaki provides this manual primarily to assist qualified service technicians in the maintenance and service of the unit. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance. HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 30269 Attn: Hoshizaki Technical Support Department Phone: 1-800-233-1940 Technical Support (770) 487-2331 Fax: 1-800-843-1056 (770) 487-3360 E-mail: techsupport@hoshizaki.com Web Site: NOTE: To expedite assistance, all correspondence/communication MUST include the following information: • Model Number • Serial Number • Complete and detailed explanation of the problem. IMPORTANT This manual should be read carefully before the unit is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the unit. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary. CONTENTS I. Specifi cations ------------------------------------------------------------------------------------------------1 A. Specifi cation Sheet -------------------------------------------------------------------------------------1 B. Nameplate Rating ---------------------------------------------------------------------------------------2 C. Dimensions/Connections ------------------------------------------------------------------------------3 II. General Information ----------------------------------------------------------------------------------------4 A. Construction ----------------------------------------------------------------------------------------------4 1. Dishwasher --------------------------------------------------------------------------------------------4 2. Internal Booster Tank -------------------------------------------------------------------------------5 3. Control Box --------------------------------------------------------------------------------------------6 B. Sequence of Operation --------------------------------------------------------------------------------8 1. Auto Fill Cycle -----------------------------------------------------------------------------------------8 2. Ready Cycle (Unit Inactive) -----------------------------------------------------------------------9 3. Wash Cycle --------------------------------------------------------------------------------------------9 4. Rinse Cycle -------------------------------------------------------------------------------------------10 5. Drain----------------------------------------------------------------------------------------------------11 C. Sequence of Operation Flow Chart ----------------------------------------------------------------12 D. Control Board and Operation Board ---------------------------------------------------------------14 1. Control Board Location ----------------------------------------------------------------------------14 2. Control Board Layout ------------------------------------------------------------------------------15 3. Control Board Diagram ----------------------------------------------------------------------------16 4. Operation Panel Layout ---------------------------------------------------------------------------18 5. Features-----------------------------------------------------------------------------------------------18 6. Controls, Adjustments, and Lamps -------------------------------------------------------------18 7. Service Menu and Error Log ---------------------------------------------------------------------19 8. Temperature Display -------------------------------------------------------------------------------22 9. Error Codes ------------------------------------------------------------------------------------------23 10. Buzzer -------------------------------------------------------------------------------------------------23 11. Special Modes ---------------------------------------------------------------------------------------23 III. Service Diagnosis ----------------------------------------------------------------------------------------26 A. Diagnostic Procedure ---------------------------------------------------------------------------------26 B. Error Codes----------------------------------------------------------------------------------------------28 1. Error Code Table ---------------------...