Bunn H5X Service & Repair Manual
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Bunn H5X Service & Repair Manual

Hot water dispensers precision water systems
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Hot Water Dispensers
Precision Water Systems
SERVICE & REPAIR MANUAL
For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
Bunn-O-Matic Corporation
Post Office Box 3227, Springfield, Illinois 62708-3227
Phone (217) 529-6601 | Fax (217) 529-6644
www.bunn.com
42311.0000 K 09/20 © 2011 Bunn-O-Matic Corporation

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  • Page 1 Hot Water Dispensers Precision Water Systems SERVICE & REPAIR MANUAL For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070. Bunn-O-Matic Corporation Post Office Box 3227, Springfield, Illinois 62708-3227 Phone (217) 529-6601 | Fax (217) 529-6644 www.bunn.com 42311.0000 K 09/20 © 2011 Bunn-O-Matic Corporation...
  • Page 2 AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND. In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.

  • Page 3: Table Of Contents

    CONTENTS TroubleShooting ...........................4 Component Access ........................7 Electronic Controls ......................... 8-11 Limit Thermostat ........................12 Safety Overflow Switch ......................13 Solenoid Valve (Late Models).....................14 Solenoid Valve (Early Models) ....................15 Tank Heater ..........................16 Steam Sensor ..........................17 Dispense Valve (H5-PC) ......................18 Dispense Valve (H3EA Element) ....................19 Dispense Switch (H3EA Element) ....................20 Mechanical Thermostat ......................21 Contactor ...........................22...

  • Page 4: Troubleshooting

    TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department. • Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
  • Page 5 TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Equipment will not operate 2. Safety overflow switch Refer to Service – safety overflow switch (cont.) for testing procedures. Automatic refill will not 1. No water Check plumbing and shut-off valves. operate after drawing hot water.
  • Page 6 TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water boils continuously. Refer to Service – electronic controls for 1. Temperature control testing procedures. 2. Lime build-up Inspect the tank assembliy for excess lime deposits. Delime as required. CAUTION – Tanks and tank components should be delimed reglarly depending on local water conditions. Exces- sive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

  • Page 7: Component Access

    SERVICE WARNING – Disconnect the dispenser from the power source before the removal of any panel or the replacement of any component. WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source.

  • Page 8: Electronic Controls

    SERVICE Liquid Level Control Flow Charts Electronic Controls H5E, H5X LIQUID LEVEL CONTROL H3/5/10 LIQUID LEVEL CONTROL PROBLEM: Does Not Refill Overflow Cup Full Remove Power Drain cup Retry Disconnect Level Probe Voltage present at Does Water Flow Replace Probe...
  • Page 9 SERVICE (cont.) Electronic Controls (cont.) 4. Remove the pink wire from terminal 5 of the elec- tronic control assembly. Liquid Level Control Test Procedure 5. Check the voltage across terminals 1 & 4 of the 1. Disconnect the dispenser from the power source. electronic control board with a voltmeter.
  • Page 10 230 volts ac for 230 volt models. 12. Disconnect the dispenser from the power source. 5. Disconnect the dispenser from the power source. H5E THERMOSTAT H3/5E THERMOSTAT H5X THERMOSTAT H5/10X THERMOSTAT PROBLEM: Boils PROBLEM: Boils Excessively - Fills Cup Drain cup...
  • Page 11 If voltage was present as described, the temperature control of the system is operating properly. If voltage was not present as described, contact Bunn-O-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9. 6. Replace the electronic control board.

  • Page 12: Limit Thermostat

    SERVICE (cont.) 4. Disconnect the dispenser from the power source. Limit Thermostat Location: If voltage was present as described, reconnect the black The limit thermostat is located on the tank lid. wire and proceed to #5. To test the limit thermostat, access will also be needed If voltage was not present as described, refer to the Wir- to the terminal block located at the rear of the dispenser.

  • Page 13: Safety Overflow Switch

    SERVICE (cont.) Safety Overflow Switch Removal and Replacement: 1. Disconnect the black wires from the safety overflow switch. 2. Remove the nut beneath the copper overflow cup. 3. Remove the entire switch assembly from the cup. 4. Place the new switch assembly into the cup, wires first.

  • Page 14: Solenoid Valve (Late Models)

    SERVICE (cont.) 8. Disconnect the dispenser from the power source. Solenoid Valve (Late Models) 9. Reconnect the pink wire to terminal 5 of the elec- tronic control board. Location: The solenoid valve is located inside the rear of the If the sound was heard as described and water will dispenser on the right side near the bottom.

  • Page 15: Solenoid Valve (Early Models)

    SERVICE (cont.) Solenoid Valve (Early Models) If continuity is present as described, reconnect the wires and proceed to #7. Location: If continuity is not present as described, replace the The solenoid valve is located behind the large access solenoid valve coil. panel on the left side of the dispenser.

  • Page 16: Tank Heater

    SERVICE (cont.) Tank Heater 4. Remove the tank heater from the tank lid and Location: inspect it for cracks in the sheath. The tank heater is located in the tank lid. If the sheath shows no sign of damage, proceed to #5. If the sheath is damaged, replace the tank heater.

  • Page 17: Steam Sensor

    SERVICE (cont.) Removal and Replacement: Steam Sensor (Thermistor) 1. Disconnect the dispenser from the power source. 2. Disconnect the thermistor from J5 on control Location: board. The thermistor is located on the end of the overflow 3. Loosen the set screw and the two screws securing tube above the overflow cup.

  • Page 18: Dispense Valve (H5-Pc)

    SERVICE (cont.) Removal and Replacement: Dispense Valve (PC & H3 Element Only) 1. Disconnect the dispenser from the power source ® Location: and allow to cool. The Dispense Valve is located behind control panel. 2. Drain enough water from the tank so the water level is below the outlet.

  • Page 19: Dispense Valve (H3Ea Element)

    SERVICE (cont.) Dispense Valve (PC & H3 Element Only) Removal and Replacement: ® Location: 1. Disconnect the dispenser from the power source The Dispense Valve is located behind control panel. and allow to cool. 2. Drain enough water from the tank so the water level is below the outlet.

  • Page 20: Dispense Switch (H3Ea Element)

    SERVICE (cont.) Dispense Switch (H3E Element Only) ® Location: The dispense switch is located in the control panel. Shroud Dispense switch FIG. 20a DISPENSE SWITCH Removal and Replacement: FIG. 20b DISPENSE SWITCH 1. Disconnect the dispenser from the power source. 2.

  • Page 21: Mechanical Thermostat

    SERVICE (cont.) Thermostat (H5M, HW2 & OHW Only) If voltage is not present as described, replace the Location: The mechanical thermostat is located inside thermostat. the upper rear panel. To test the thermostat, access will also be needed to the terminal block located inside the Removal and Replacement: bottom access panel.

  • Page 22: Contactor

    SERVICE (cont.) If voltage is not present as described refer to the Wiring Contactor (H5M Only) Diagrams and check the wiring harness. 5. Check for continuity between the left and right terminals on the contactor coil. If continuity is present as described, reconnect the wires and proceed to #6 If continuity is not present as described, replace the contactor.

  • Page 23: Liquid Level Board

    SERVICE (cont.) Liquid Level Board (H5M & HW2 Only) 7. Check the voltage across terminals 1 & 3 with a voltmeter. Connect the dispenser to the power source. Turn the thermostat knob to the “ON” posi- tion (fully clockwise). The indication must be: a.) 100 to 120 volts ac for 100 to 120 volt models, b.) 200 to 240 volts ac for 200 to 240 volt models, c.) 230 volts ac for 230 volt models,...
  • Page 24 SERVICE (cont.) 2. Remove two #8-32 screws holding level control Liquid Level Board (cont.) (H5M & HW2 Only) board and mounting bracket to the component 15. Move the probe’s flat end to the dispenser housing. bracket. The indication must be 0. 3.

  • Page 25: Schematic Wiring Diagrams

    USE ONLY J3-5 J1-5 TANK H5-PC t° NO JUMPER Early H5E, H5X, H10X Install jumper thru ver. 1.04 STATIC SHIELD NOTE: no jumper used on any Model starting with ver. 1.08 120V AC 2 WIRE + GND 120/208V AC 3 WIRE + GND 39333.0000D 09/09...
  • Page 26 0-13.8VAC USE ONLY J3-5 J1-5 TANK H5-PC t° NO JUMPER Early H5E, H5X, H10X Install jumper thru ver. 1.04 STATIC SHIELD NOTE: no jumper used on any Model starting with ver. 1.08 230V AC 2 WIRE + GND 39333.0001C 10/09 SINGLE PHASE ©2006...
  • Page 27 0-13.8VAC USE ONLY J3-5 J1-5 TANK H5-PC t° NO JUMPER Early H5E, H5X, H10X Install jumper thru ver. 1.04 STATIC SHIELD NOTE: no jumper used on any Model starting with ver. 1.08 200V AC 2 WIRE + GND 39333.0002A 12/12 SINGLE PHASE ©2006...
  • Page 28 Install jumper thru ver. 1.04 200-240 VOLTS AC REFILL POWER NOTE: no jumper used on any 2 WIRE + GND Model starting with ver. 1.08 SINGLE PHASE 40707.0000C 09/09 © 2008 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 5.5” x 8.0”...
  • Page 29 Early H5E, H5X, H10X HEATER READY Install jumper thru ver. 1.04 100-120 VOLTS AC REFILL POWER NOTE: no jumper used on any 200-240 VOLTS AC Model starting with ver. 1.08 2 WIRE + GND SINGLE PHASE 42375.0000A 09/09 © 2009 BUNN-O-MATIC CORPORATION...
  • Page 30 Early H5E, H5X, H10X HEATER READY Install jumper thru ver. 1.04 REFILL POWER 230 VOLTS AC NOTE: no jumper used on any Model starting with ver. 1.08 2 WIRE + GND SINGLE PHASE 40712.0000F 05/11 © 2008 BUNN-O-MATIC CORPORATION...
  • Page 31 MAIN CONTROL N.O. BOARD RELAY PINK J4-1 DISPLAY GRN/YEL BOARD STEAM SENSOR USED ON J3-1 t° H5X ONLY TEMP PROBE J2-1 J1-1 REFILL PROBE J1-5 TANK t° 44657.0000B 05/11 ©2011 100-240V AC 2 WIRE + GND BUNN-O-MATIC CORPORATION SINGLE PHASE...
  • Page 32 WHI/RED MAIN CONTROL BOARD RELAY PINK J4-1 DISPLAY GRN/YEL BOARD STEAM SENSOR USED ON J3-1 t° H5X ONLY TEMP PROBE J2-1 J1-1 REFILL PROBE J1-5 TANK t° 44657.0001B 09/16 ©2011 220-240V AC 2 WIRE + GND BUNN-O-MATIC CORPORATION SINGLE PHASE...
  • Page 33 J4-1 DISPLAY GRN/YEL BOARD J3-1 TEMP PROBE J2-1 J1-1 REFILL PROBE J1-5 TANK t° 44657.0002B 09/16 ©2014 230V AC 2 WIRE + GND BUNN-O-MATIC CORPORATION SINGLE PHASE White Strip-Tac Plus Black Ink Finished Size: 5.5” x 8.0” ~ No Reduction...
  • Page 34 WHI/RED TRIAC MAIN CONTROL BOARD CURRENT LIMITING RELAY RESISTOR BRN/BLK DISPENSE SWITCH PINK J4-1 DISPLAY GRN/YEL BOARD J3-1 TEMP PROBE J2-1 J1-1 REFILL PROBE J1-5 TANK t° 44657.0003A 06/15 ©2015 120V AC 2 WIRE + GND BUNN-O-MATIC CORPORATION SINGLE PHASE...
  • Page 35 LIQUID LEVEL OVERFLOW BOARD PROTECTION SWITCH 120 VOLTS A C (PROBE) 2 WIRE + GND SINGLE PHASE 10243.0000E 01/07 © 1987 BUNN-O-MATIC CORPORATION SCHEMATIC WIRING DIAGRAM H5M GREEN MAIN ON/OFF SWITCH (Late Models only) OPTIONAL N.O. N.O. READY INDICATOR TANK HEATER SW&...
  • Page 36 KEEP WARM HEATER LIQUID LEVEL BOARD SAFETY SW BLU/BLK 120 VOLTS A C 2 WIRE (PROBE) SINGLE PHASE 10261.0000E 5/98 © 1987 BUNN-O-MATIC CORPORATION SCHEMATIC WIRING DIAGRAM HW2A GRN/YEL SW. & LIMIT THERMOSTAT THERMOSTAT TANK HEATER White Strip-Tac Plus KEEP WARM HEATER Black Ink Finished Size: 3.5"...
  • Page 37 THERMOSTAT 1000W 120 VOLTS A C TANK HEATER 2 WIRE SINGLE PHASE KEEP WARM HEATER 60 HZ 10269.0000B 06/98 © 1988 BUNN-O-MATIC CORPORATION SCHEMATIC WIRING DIAGRAM OHWA GRN/YEL THERMOSTAT 1000W 230 VOLTS A C TANK HEATER 2 WIRE SINGLE PHASE...

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