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H10X/H5X
H5E/DV PC
H5 ELEMENT
With Digital Control Board
SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit
the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain
the latest catalog and manual updates. Contact Bunn-O-Matic Corporation at 1-800-286-6070 to
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BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) All equipment other than as specifi ed below: 2 years parts and 1 year labor. 2) Electronic circuit and/or control boards: parts and labor for 3 years. 3) Compressors on refrigeration equipment: 5 years parts and 1 year labor. 4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 po
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WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualifi ed service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifi cally states to connect the dispenser to the power source. CONTENTS T roubleShooting ............................................................................................ 4 Component Access ............................................
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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 qualifi ed service person- nel. � All electronic components have 120 – 240 volt ac and low voltage dc potential on their terminals. Shorting of terminals or
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Equipment will not operate 2. Safety overfl ow switch Refer to Service – safety overfl ow switch (cont.) for testing procedures. Automatic refi ll will not oper- 1. No water Check plumbing and shut-off valves. ate after drawing hot water. 2. Water strainer/fl ow control (A) Direction of fl ow arrow must be point- ing towards dispenser. (B) Remove the strainer/fl ow control and check for obstructions. Clear or replace. 3. Liquid level system Ref
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water boils continuously. 1. Temperature control Refer to Service – electronic controls for 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. Dispenser is making unu
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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 qualifi ed service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifi cally states to connect the dispenser to the power source. Component Access - H5E/DV-PC/X Component Acc
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SERVICE Liquid Level Control Flow Charts Electronic Controls H5E, H5X LIQUID LEVEL CONTROL PROBLEM: Does Not Refill Yes Overflow Cup Full Remove Power ? Drain cup No Retry Disconnect Level Probe Yes Yes Voltage present at Does Water Flow Replace Probe Solenoid Valve ? ? No No H 5 Unplug Ready Lamp Replace Solenoid Valve P4093.35 Voltage present at Yes FIG. 8a ELECTRONIC CONTROL Replace Ready Lamp Solenoid Valve ? No Replace Control Board Triac Assy H5E, H5X LIQUID LEVEL CONTROL PROBLEM: Overflow
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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. Connect 2. Check the voltage across terminals 3 & 4 of the the dispenser to the power source. The indication electronic control board with a voltmeter. Connect must be: the dispenser to the p
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Electronic Controls (cont.) If voltage was not present as described, check the pink 7. Reconnect the pink wire to terminal 5 of the elec- probe wire and the green ground wire for continuity tronic control assembly. 8. Loosen the compression fi tting, remove the probe and/or replace the probe. from the tank lid, and inspect it for mineral depos- Temperature Control Test Procedure its. Replace it if necessary. Keep the exposed ends of the probe away from any metal surface of the 1. Disconnect
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SERVICE (cont.) Electronic Controls (cont.) 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. T5 PNK to Liquid 7. Check the voltage across the tank heater terminals Level Probe with a voltmeter. Connect the dispenser to the T4 WHI or RED to Terminal
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SERVICE (cont.) If voltage was present as described, reconnect the black Limit Thermostat wire and proceed to #5. Location: If voltage was not present as described, refer to the Wir- The limit thermostat is located on the tank lid. ing Diagrams and check the dispenser wiring harness. To test the limit thermostat, access will also be needed to the terminal block located at the rear of the dispenser. 5. Check for continuity across the terminals of the limit thermostat. If continuity is not pres
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SERVICE (cont.) Removal and Replacement: Safety Overfl ow Switch 1. Disconnect the black wires from the safety overfl ow switch. 2. Remove the nut beneath the copper overfl ow cup. 3. Remove the entire switch assembly from the cup. 4. Place the new switch assembly into the cup, wires fi rst. Make sure that a gasket is in place around the threaded switch stem. NOTE - The magnets must be at the top of the fl oat and there must be NO stainless steel washers installed for H 5 the safety overfl ow swi
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l i i l l ! WARNING Fill water tank before turning -on thermostat or connecting appliance to power source. Use on y on a properly protected circuit capable of the rated load. Electrically ground the chass s. Follow nat onal/local e ectrical codes. Do not use near combustib es. FAILURE TO COMPLY RISKS EQUIPMENT AMAGE, FIRE, O SHOCK AZAR D R H D READ THE ENTIRE OPERATING MANUAL INCLUDING THE LIMIT OF WARRANTY AND LIABILITY BEFORE BUYING OR USING THIS PRODUCT THIS APPLIANCE IS HEATED WHENEVER CONNE
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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. To test the solenoid valve, access will also be needed 7. Check the solenoid valve for coil action. Connect to the electronic control board. the dispenser to the power source. Listen careful
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SERVICE (cont.) Tank Heater 4. Remove the tank heater from the tank lid and in- Location: spect 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. 5. Check for continuity across the tank heater termi- nals. If continuity is present as described, reinstall the tank heater. The tank heater is operating properly. If continuity is not present as described, replace the tank
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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 overfl ow 3. Loosen the set screw and the two screws securing tube above the overfl ow cup. the two half blocks together. Remove thermistor To test the thermistor, access will also be needed to assembly from overfl ow tube. the electronic control board. 4. Install new th
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SERVICE (cont.) Dispense Valve (PC Only) If voltage is not present as described, refer to Wir- Location: ing Diagrams and check the dispenser wiring harness. The Dispense Valve is located behind control panel. Also check the control board for proper operation. Removal and Replacement: 1. Disconnect the dispenser from the power source and allow to cool. 2. Drain enough water from the tank so the water level is below the outlet. Bracket 3. Remove the nut and fl are nut from the valve. Shroud 4.
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MEMBRANE SWITCH ASSY Ready Power Heater Manual Dispense/Stop Left Dispense Middle Dispense Right Dispense “Hidden” Switch J2 6 10 1 5 L1 N L2 SCHEMATIC WIRING DIAGRAM H5E-DV PC GRN BLK-14 RED-14 Earth Ground MASTER ON/OFF SWITCH Chassis Ground RED-14 BLK-18 SELECTOR LIMIT SWITCH TANK HEATER THERMOSTAT BRN-14 BLK-14 BLK-14 4000 W TANK HEATER WHI/VIO-14 WHT-14 1800 W N.C. REFILL WHT-18 WHI/BLU-18 120VAC SOL OVERFLOW PROTECTION SWITCH 4 3 WHI-18 J7 2 1 WHT-18 VI
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MEMBRANE SWITCH ASSY Ready Power Heater Manual Dispense/Stop Left Dispense Middle Dispense Right Dispense “Hidden” Switch J2 6 10 1 5 L1 L2 SCHEMATIC WIRING DIAGRAM H5E-PC GRN RED-14 BLK-14 Earth Ground EMI FILTER Chassis Ground BLK-18 RED-14 LIMIT LIMIT THERMOSTAT THERMOSTAT TANK HEATER BLK-14 BLK-14 BLU-14 BLU-14 4000 W N.C. REFILL WHI/BLU-18 230VAC RED-18 OVERFLOW SOL PROTECTION SWITCH 4 3 RED-18 DISPENSE J7 2 1 RED-18 VIO-18 230VAC SOL 5 4 N.O. 3 COM 2 1
