Bunn JDF-2S/4S Juice Dispenser Troubleshooting
The Bunn JDF-2S and 4S juice dispensers are great for crowds. By mixing concentrate with water, these machines allow service stations, cafeterias, buffets and high-volume restaurants to serve a lot of people quickly and efficiently.
Even though these machines are top-notch, they can still have issues on occasion. By following this Bunn JDF-2S and 4S juice dispenser troubleshooting guide, you can identify and resolve common issues when they arise.
Dispense Stations Not Dispensing Juice
- Cabinet cooling fan not working - Contact a licensed technician to replace the fan.
- Bath recirculation pump not working - If the pump is not running, contact a service technician.
- Water flow to cabinet water coil and bath is restricted - Check to see if the hose is kinked.
Dispense Nozzle Dripping Or Won’t Stop Dispensing
- O-ring on dispense nozzle no longer vacuum-sealed due to buildup of juice residue - Using a soft bristle brush and mild detergent, clean the:
- Dispense nozzle
- O-ring
- Dispense valve area
- Membrane switch models - Contact a service technician to check the dispense switches.
- Mechanical switch models: juice residue on switches - First, clean the switches. If cleaning the switches does not resolve the issue, contact an authorized technician to replace the switches.
Dispense Stations Not Dispensing Juice (Refrigeration Issue)
- Compressor switch not turned “ON” -
- First, make sure the switch is turned “ON.”
- If turned “ON” but the issue persists, contact a service technician.
- Condenser filter or fins are dirty - Clean the filter and fins, following the directions in your operator’s manual.
- Condenser fan motor is not running - Contact an authorized technician to remedy the issue.
- Compressor relay not turning on - Call a service technician to check the compressor relay coil.
- Compressor not running - Schedule an appointment with a technician to check the compressor thermal overload.
- Compressor running but not cooling - Contact a service technician to check the refrigeration system.
Dispense Stations Not Working (Dispensers Locked Out)
- Dispense lockout switch not turned “ON” - Turn switch “ON.” If the problem persists, schedule an appointment with a service technician to check the switch and harness.
Cooling System Failure
- Refrigeration system issue - Contact a licensed technician to solve the issue.
Dispense Station Not Working (General)
- Dispense lockout switch is “OFF” - Turn switch “ON.”
- Dispense switch failure - Contact a service technician to check the switch and harness.
All Stations Dispense Unmixed Concentrate Only
- Main water supply is not turned “ON” - Check to make sure that the water supply is turned “ON.”
- Bath tank frozen - If the bath tank is frozen:
- Contact a technician to replace the compressor relay.
- Call a technician to check for a kinked flex line.
- Inlet water valve failure - Contact a technician to check the voltage.
Single Dispense Station Serves Unmixed Concentrate Only
- Defective water solenoid valve - Contact an authorized technician to check the wire connection and wiring between the water valve and the main control board.
Single Dispense Station Dispenses Water Only
- Out of concentrate - Replace the refill concentrate container.
- Product pump not pumping - Contact a technician to check the pump rollers.
- Pump not turning - Schedule an appointment with a technician to check the speed setting on the circuit board.
Leaking Water Is Filling Drip Tray Or Dispense Deck Area
- Initial fill and setup - Some water may leak out and fill the drip tray during the initial ice block formation.
- Dispense deck components are defective - Contact a technician to inspect dispense deck components.
- Water pressure exceeds 100 psi - Call a local service technician to Install a water pressure regulator and reduce pressure to 50 psi.
Water Leaking Beneath Machine
- Bath tank overflowing - Check the internal water and plumbing connections.
- Condensation from cabinet cooling coil - Make sure that the condensation tube is connected to the water bath.
Erratic Spray During Dispense
- Missing or broken dispense nozzle mixer - Replace the dispense nozzle mixer.
Dispense Nozzle Dripping Water
- Defective dispense solenoid - Contact a technician to replace the dispense deck solenoid.
Unit Is Not Working
- Step-down transformer is defective - Contact a technician to check the step-down transformer.
- Main control board is not working - Call a licensed technician to check the control board.
Difficulty Brixing And / Or Weak Beverage
- Low viscosity (product is too cold to flow easily) - Concentrate should be thoroughly thawed (35° - 40° Fahrenheit) before use. If possible, replace the concentrate with fully thawed product.
- Water pressure is too low - Make sure that:
- The water pressure is 20 psi or higher
- The water flow rate is a minimum of 3 fl oz/sec.
- Water pressure is too high - If the water pressure is greater than 100 psi, contact an authorized technician to install a regulator.
- Dispense valve settings are not optimal - Schedule a service appointment with a technician to:
- Test the water dispense valves
- Adjust the water to proper mix ratio
- Brix ratio is not optimal - Check the proper brix ratio of each product using the Total Dispense Method or the Refractometer Method.
- Pump tubing is not optimized - Contact a technician to check tubing and pump rotor / rollers.
- A portable water pump is not functioning properly - If you are using a portable water pump, be sure to use a pump that meets the pressure and flow rate requirements. If it does not, use a different pump.
Difficulty Brixing Bag-In-Box
- Vacuum Leak - Inspect all the lines and connections from the bag-in-box connector to the bottle adapter assembly.
For more troubleshooting information, take a look at our library of Bunn manuals online.