Hobart commercial dishwasher troubleshooting

Hobart commercial dishwasher troubleshooting

In most cases, when a malfunction occurs, dishwasher owners prefer to address service centers. However, it is not always worth to do that as sometimes the problem can be eliminated with the owner’s hands. To do this, look for the cause of the problem in the table below. It also lists tips on how to fix most problems.

Hobart AM900 dishwasher troubleshooting

Dishes are not clean.Wash arms stiff (you should be able to turn them easily by hand).Take out wash arms and clean them thoroughly. Check water outlet from machine to wash arms is clear.
Wash arm nozzles are clogged (visual check).Take out wash arm, remove cleaning cap and rinse wash arm thoroughly until soil is removed.
Replace correctly.
Rinse arm nozzles are clogged (possibly by lime deposit)Remove rinse arms and decalcify them in separate container.
Detergent concentration is too low or too high.Check setting of detergent concentration.
Coarse strainer soiled.Take out strainer, empty and clean it.
Fine strainer soiled or obstructed by lime.Take out fine strainer. If heavily soiled soak in a vinegar solution. Then clean it thoroughly until the pores are free.
Cleaning is to be done daily.
Wrong program selected for heavily soiled dishes.Select program with longer wash cycle.
Dishes or glasses do not dry properly.Rinse aid concentration too low.Increase concentration.
Dishes still greasy.1. Detergent concentration too low: increase.
2. Check if detergent is appropriate. If not choose a stronger one.
3. Drain soiled water and refill machine.
Check pre-scrapping procedure.
Rack is not suitable for type of dishes (sloping).Use appropriate racks to create a sloping position which allows water to drain away from cavities.
Dishes stay too long in the machine at the end of program.Take out dishes as soon as cycle is completed to enable them to dry.
Stripes and staines on dishes or glasses.Rinse aid concentration too high.Reduce quantity.
Hard water or high mineral content.Check water quality.
Obtain details from local water authority.
Recommended values:
Ideal degree of hardness is 4 Clark.
Ideal conductivity value for glasses is max. 150 pS/cm and for dishes max. 400 pS/cm.
Rack is not suitable for type of dishes (sloping).Use appropriate racks to create a sloping position which allows water to drain away from cavities.
Insufficient rinse aid concentration causes stainesIncrease quantity
Machine with softener:Use only granular regeneration salt.
Wrong type of salt used.
Glasses are totally or partially cloudySurface of glasses is rough and porous, this is called glass corrosionThis is not caused by a malfunction on the machine. Replace with new glasses.
Glass breakages.Use of inappropriate dish or glass racks.Use appropriate racks.
Machine suddenly stops during wash program.Machine is connected to a ‘maximum power supply unit" which cuts out the energy consumer at a given point, or ma- chine is interlocked with another energy consumer unit.Connect machine separately (call electrician).
Blown site fuse.Check site fuses.

Hobart GC-10A dishwasher troubleshooting

Error codeMessage textMeasure
3Temperature not reached. Contact service technician.Contact your HOBART Service Partner.
21Fault in the drain system. Clean the drain hose if necessary and pump-out the machine again.Clean the drain hose if necessary and pump- out the machine again.
22Fault in the drain system. Clean the drain hose if necessary.Clean the drain hose if necessary.
29Program aborted. Close the door.Close the door.
36Detergent deficiency. Refill detergent.Refill detergent
37Rinse aid deficiency. Refill rinse aid.Refill rinse aid
38Input voltage too high! Machine has been switched off.Have the input voltage checked by the (site) electrician.
39Filling program aborted. Close the door.Close the door.
41External water treatment depleted. Replace.Replace part or full desalination cartridge.
42Osmosis pre-filter depleted. Replace.Replace pre-filter.
43Salt deficiency. Refill regenerating salt.Refill regenerating salt
1Hot water tank temperature sensor fault. Contact service technician.Contact your HOBART Service Partner.
6Wash tank temperature sensor fault. Contact service technician.
11Wash chamber temperature sensor fault. Contact service technician.
13Disinfection not guaranteed. Contact service technician.
14Booster pressure sensor fault. Contact service technician.
16Wash tank pressure sensor fault. Contact ser- vice technician.
17Tank pressure sensor fault. Contact service technician.
18Fault in the filling or drain system. Contact ser- vice technician.
19Strainer blocked. Remove, clean and re-insert.Remove, clean and re-insert strainer.
20Wash tank pressure sensor fault. Pump-out machine.Pump-out machine.
23Fault in the filling system. Supply quantity too low.Check site flow pressure.
31Fault in the filling system. Check water supply.Check water supply.
33Fault in the filling system. Contact service technician.Contact your HOBART Service Partner.
35Insert tank cover strainer correctly.Insert tank cover strainer correctly.
44Salt deficiency. Refill regenerating salt.Refill regenerating salt
45Number of wash cycles without regenerating salt exceeded. Contact service technician.Contact your HOBART Service Partner.
52Fault in the filling or drain system. Contact ser- vice technician. Disconnect machine from the water and power supply!

Hobart LXI dishwasher troubleshooting

SymptomPossible Causes
No machine operation (no display).1. Machine OFF - turn machine ON.
2. Blown fuse or circuit breaker off at power supply.
3. Cord not plugged in (corded models only)
No machine operation (with display).1. Display: “dr" "oP" - open and close door. If problem persists, contact your local Hobart Service Office.
Dishes not clean.1. Strainers clogged causing inadequate water supply to pump - clean according to instructions. 2. Obstruction in wash arm(s) or wash arms will not turn - clean
3. Wash or rinse arms will not turn - check that they spin.
4. Detergent dispenser may be clogged.
5. Soil quantity - scrape dishes before cycle.
6. Improper rack loading.
7. Low water - check water pressure.
8. Water temperature too low - note wash temperature on display during WASH; should be above 120F for chemical-sanitizing machines and above 150F for other machines.
9. Incoming water supply turned off.
Spotting of silverware, glasses or dishes.1. Improperly loaded racks.
2. Water temperature too low.
3. Improper type or concentration of detergent - contact your local detergent representative.
4. Hard water - install a water softener; use a rinse agent.
5. Insufficient fill - check water pressure.
Chemicals not feeding.1. Low on chemicals - check levels.
2. Air leak at feeder hose connections - check for snugness.
3. Tubes kinked - check for smooth bends.
Food soils remain in dishwasher.Follow daily cleaning instructions.
Unexpected results on dishes.1. Etching - usually caused by any combination of high temperatures, soft water, soft glass or high alkaline washing solutions.
2. Tarnishing - avoid washing silver, silver plates and pewter in chemical-sanitizing machines.
3. Pitting - stainless steel may pit with lengthy contact of foods containing salt, fruit juices, vinegar, etc. Wash immediately.
4. Black or gray marks - may have been rubbed with aluminum.
5. Brown stains - may be due to high iron content in water supply.
6. Chipping - improper loading or ware is too delicate.
7. Fading of china patterns - usually due to high water temperature and strong detergent. Check that china is dishwasher compatible.
8. Wooden ware damage - avoid washing in dishwasher.
9. Rust on cast iron - seasoning is lost in dishwasher. Avoid dishwasher cleaning.
10. Plastic ware distortion - high temperatures. Check plastic ware's instructions.
Low-temperature readings.1. Low water supply temperature - make sure it meets the recommended limits.
2. Rapid cycle use - if incoming water temperature is low and cycle use rate is high, the hot water supply may be insufficient to meet the demand.
3. Heavy ware load cools wash water - do not overload racks.
4. Booster heater or sump heater set low - contact your local Hobart Service Office.
Machine will not fill or will not fill high enough. (Display shows EO, E2, E3 or E4. Machine will not run).1. Low water pressure - check for clogged hose strainer; ensure the site water pressure meets minimum flow pressures.
2. Make sure probes are clean.
3. No water pressure - main water supply valves may not be working.
4. Anti-siphon valve - located in the lower left area of the chamber just above the water line. Drain the machine and insert toothpick or similar object into hole to verify ball (Vie" OD) is free to float.
5. Delime machine.
Machine fills too high or leaks from door. (Display shows CL/Pr.)1. Machine not level.
2. Fill solenoid valve leaking - turn the dishwasher OFF; if water continues to come in, contact your local Hobart Service Office.
hobart dishwasher solenoid valve
3. Clean water level probes.
Machine will not drain. (Display shows E5).1. Drain pipes restricted - check dishwasher drain line for kinks; ensure proper drain rate is allowed from plumbing.
2. Turn machine OFF. Wait several seconds and then turn back ON. Repeat this procedure twice if necessary. If problem persists, contact your local Hobart Service Office.
Some water occasionally drips out of rinse arms (H dishwashers only).This is normal due to expansion of water being heated in the booster tank.
Machine displays E6.Contact your local Hobart Service Office.
Machine lights up wrench and flashes P1, P2 or P3.
Machine lights up wrench and chemical icon.

Hobart АЕ900 dishwasher troubleshooting

Machine Won't Operate After Start Button is Pressed.1. Blown fuse or tripped circuit breaker at power supply.
2. Inspection door(s) not closed, Door(s) Open displays.
3. Conveyor may be jammed.
4. Check drains, make sure they're closed. Check tanks, make sure they're full.
Ware Not Clean.1. Insufficient pre-scraping or tank water may need to be changed.
2. Missing end plug from wash arm.
3. Wash arm nozzle obstruction.
4. Water leaking past manifold O-ring.
5. Loss of water pressure due to pump obstructions.
6. Incorrect water temperature. Check circuit breaker to electric heat supply, or main steam valve. Make certain valve is completely open.
7. Incorrect detergent dispensing. Contact your chemical representative.
8. Manual overload on pump motor(s) may have tripped.
9. Wash arms installed incorrectly.
10. Ware not loaded properly.
Leaking Vacuum Breaker.1. Foreign material or corrosion could be preventing proper valve operation. Shut off all incoming water supply line(s). Unscrew and lift bonnet from valve body. Clean valve and reassemble.
Spotting of Ware.1. Ware not loaded properly.
2. Incorrect final rinse water temperature (minimum 180F) or inadequate water pressure (15 to 25 psi is recommended).
3. Incorrect rinse aid dispensing. Contact your chemical representative.
4. Improper water hardness (3 grains or less per gallon is recommended).
5. Incorrect detergent for water type.
6. Clogged rinse nozzle(s).
7. Misaligned rinse arms. Rinse arms should be positioned so that they align in hub on chamber wall.
Inadequate Rinse.1. Dirty line strainers causing reduced water flow. Turn off water supply, remove strainer cap, withdraw and clean screens.
2. Low supply line pressure.
3. Rinse Arm(s) are not properly inserted in the hubs.
4. Clogged Dual Rinse Nozzle(s) on FT900D or FT900SD — clean the Nozzle(s).
5. Dual Rinse Tank Strainer Pan is clogged on FT900D or FT900SD — clean the Strainer Pan.
Continuous Rinse Operation1. Photoelectric sensors are blocked. Clean sensor openings.
2. Remove side panels from load end of machine adjacent to prewash chamber. With machine power on, verify indicators on sensor flash on and off when blocking and unblocking the sensor.
3. Improperly operating rinse solenoid valve. Contact Hobart Service.
4. Problems with conveyor motor drive. Put machine in Standby (by pressing the Power key) for at least 60 seconds to allow drive and motor to fully discharge and reset. Turn machine back on. If problem persists, contact Hobart Service.
Tanks Not Heating.1. Low water safety devices shut off heat. Check for proper water level.
2. Lower float(s) do not move freely.
3. Circuit breaker(s) to heat system tripped (electric heat).
4. Steam supply valve(s) are not opened completely or supply pressure too low (steam heat).
5. Overtemp protector tripped (electric heat). Contact Hobart Service.
6. Failed heating element (electric heat). Contact Hobart Service.
7. Bucket trap not functioning correctly (steam heat). Contact Hobart Service.
8. Improperly operating steam solenoid valve(s) (steam heat). Contact Hobart Service.
No Fill or Slow Fill.1. Door(s) are open.
2. Main fill (water supply valve) could be closed.
3. Upper and / or lower fill floats do not move freely.
4. Dirty line strainer causing reduced water flow. Turn off water supply, remove strainer cap, withdraw and clean screens.
5. Problem with solenoid valve. Contact Hobart Service.
6. Low incoming water supply pressure.
7. Drain(s) open.
No Blower-Dryer Heat (Electric Heat Blower- Dryer).1. Blower or motor not operating properly.
2. Circuit breaker to electric blower-dryer heaters tripped.
3. Overtemp protector tripped; red overtemp indicator light is lit. Contact Hobart Service.
No Blower-Dryer Heat (Steam Blower-Dryer).1. Blower or motor not operating properly.
2. Improperly operating steam solenoid valve (when equipped).
3. Steam supply valve is not completely open or supply pressure is too low.
5. Bucket trap not functioning correctly.
6. Missing or dirty filter.
Door(s) OpenClose all inspection doors.
Unload DishesRemove all ware from unload section of the machine, starting with the ware closest to the machine chambers. Finally remove the last ware that is in contact with the dish limit bar.
Temp Err - [Tank Name]Ensure lower float assembly in indicated tank is not visibly damaged and sufficient water is in the tank to cover the lower float.
Fnl Rinse Temp Low1. If problem is intermittent and only occurs after the machine has been idle for several minutes, this is normal. The problem will correct itself after running several pieces of ware through the machine.
2. Check that the final rinse booster tank circuit breaker is on and not tripped (if equipped.)
3. Check that the final rinse booster tank overtemp circuit is not tripped (if equipped).
4. Ensure that the building supply water to the final rinse booster tank is at least the minimum specified by the booster manufacturer.
Temp Err - Fnl RnsEnsure that the supply water valve to the final rinse booster is open.
Check Water Level1. Ensure all drains are closed and free of debris.
2. Check that water supply valve is open
3. Open inspection doors and check water level of all tanks. Watershould be about 1 inch down from top of strainer pan or higher. Do not forget to check the water level of the dual rinse tank (models FT900D or FT900SD) which is located behind the control box directly beneath the final rinse arms. Close inspection doors.
4. If tanks fail to fill after another 20 minutes, contact Hobart Service.
Reset RequiredPlace machine in Standby by pressing the Power key. Wait at least 60 seconds before powering on the machine.