Hobart dishwasher troubleshooting

The Hobart Corporation was established in 1897. The US manufacturer produces a wide range of commercial appliances for the foodservice and grocery industry. The range doesn’t include household appliances, like washing machines or coffee makers, but there is a variety of food preparation machines, labeling systems, and waste disposal systems.
Your dishwasher leaves the dishes wet, your washer is not spinning or there is any other issue? You’ve come to the right place. Here, you will find expert advice on dishwasher repair and washer repair. Whatever washer or dishwasher problems you encounter (for instance, the appliance wont spin or the dishes are dirty after the wash cycle is over), we have several possible explanations and a step-by-step guide how to fix your dishwasher or washer.
Hobart AM15 ML-130038 dishwasher troubleshooting
Hobart ecomax 402 dishwasher troubleshooting

Hobart AM15 ML-130038 dishwasher troubleshooting

The Hobart AM15 is a range of commercial dishwashers operating on liquid gas. One of the most popular models in this lineup is AM15 ML-130038. It can work in one of the two modes: hot water sanitizing or a chemical sanitizing mode. Some of the models are equipped with an Electric Booster Water Heater, while others don’t have this feature.

ProblemsSolutions
No machine operation.1. Machine off, turn machine on.
2. Blown fuse or tripped circuit breaker at power supply.
3. Check tank water level.
Dishes not clean.1. Insufficient wash water due to drain obstruction preventing proper drain closing.
2. Worn or torn drain O-ring allowing wash water to drain.
3. Loss of water pressure due to pump obstruction.
4. Incorrect water temperature. Contact Service for adjustment or repair.
5. Incorrect detergent dispensing. Contact your detergent representative.
6. Excessive mineral deposits throughout wash and rinse system. Deliming may be necessary, refer to page 20.
7. Check wash and rinse arms to make sure they rotate properly.
8. Strainers clogged causing inadequate water supply to pump; clean machine according to Cleaning, page 19.
9. Obstruction in wash arms or wash arms will not turn; clean machine according to Cleaning, page 19.
10. Detergent dispenser may be clogged.
11. Excessive soil quantity; scrape dishes before cycle.
12. Improper rack loading; refer to Preparation and Dishwashing, pages 17, 18.
13. Incoming water supply turned off.
Spotting silverware, glasses and dishes.1. Improperly loaded racks.
2. Incorrect rinse water temperature or rinse pressure.
3. Loss of water pressure due to pump obstruction.
4. Excessively hard water.
5. Incorrect detergent for water type.
6. Incorrect rinse additive for water type.
7. Incorrect concentration of detergent, rinse additive and/or sanitizer.
8. Excessive soil quantity; scrape dishes before cycle.
Inadequate rinse or rinse water temperature too low. Possible EE display.1. Dirty line strainer causing reduced water flow. Turn off water supply, remove strainer cap, withdraw and clean screen. Reassemble.
2. Low supply line pressure.
3. Excessive mineral deposits throughout wash and rinse system. Deliming may be necessary, refer to page 20.
4. Incoming water temperature to booster (if applicable) below 110°F. Machine will automatically extend wash time until booster heats up (this applies to booster equipped machines only).
5. If EE displays: Booster did not reach temperature within 8 minutes after initial fill. Press OFF, wait 5 seconds and press ON. May be booster heater failure.
Leaking valve.1. Foreign material preventing proper valve operation. NOTE: A critical period is soon after installation when pipe compound or metal shavings may lodge at the valve seat. Shut off supply line. Unscrew and lift bonnet from valve body. Clean valve and reassemble.
2. If a solenoid valve is malfunctioning (not opening or not closing), it is recommended that you contact Hobart Service.
No wash tank heat.1. The machine is equipped with a low water safety device which shuts off heat if the water level drops. Check for proper water level. If the water level is too low, the overflow tube might be out of position. Or, something may be inhibiting free movement of the low water float; remove any foreign object from around the low water float or its magnet.
2. Gas line closed.
3. Blown fuse or tripped circuit breaker at power supply.
If a failure occurs due to the gas heat control board or gas pressure, contact Hobart Service.
No or slow fill. Possible E2 display.1. Debris may be obstructing standpipe movement allowing fill water to drain.
2. Water supply may be off; make sure water supply valve is open.
3. Dirty line strainer causing reduced water flow. Turn off water supply, remove strainer cap, withdraw and clean screen. Reassemble.
4. Worn or torn drain O-ring allowing wash water to drain.
5. If E2 displays: Water did not reach the float during a fill within 2.5 minutes. Press OFF, wait 5 seconds and press ON.
Possible Ed display.1. Slow leak. Make sure the drain lever is closed, the standpipe is seated and the O-ring is clear of all food soil or other debris.
Dribbling water from lower rinse arm.1. If equipped with electric booster, normal dripping from the lower rinse arm will occur during water heating due to expansion of the water. This will occur once between machine cycles.
2. If water dribbles or leaks continuously from rinse arms on any machine, refer to Leaking Valve, above.
Possible E6 display.1. Contact your local Hobart Service Office.
Wrench lights up and P1, P2 or P3 displays.1. Contact your local Hobart Service Office.

Hobart ecomax 402 dishwasher troubleshooting

The Hobart ecomax 402 dishwasher is a commercial model designed for washing the dishes and glass. It has the noise level of < 70 dB (A). It is possible to select between two types of cycles: a short cycle and a standard cycle. Also, there is self-cleaning cycle, which can be activated by pushing and holding the Drain/OFF button. In case a dishwasher is equipped with a drain pump, it will drain the tank automatically.

TYPE OF FAILUREPOSSIBLE CAUSEREMEDY
Washware 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 the 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. See also operating instructions point 6.1.
Coarse strainer soiled.Take out strainer, empty and clean it.
Wrong program selected for heavily soiled washware.Select program with longer wash cycle.
Dishes or glasses do not dry properly.Rinse aid concentration too low.Increase concentration.
See also operating instructions point 6.2.
Items to be washed still greasy.Detergent concentration too low: increase (see instructions).
Check if detergent is appropriate. If not choose a stronger one.
Drain soiled water and refill machine. Check pre-scrapping procedure.
Rack is not suitable for type of washware.Use appropriate racks to create a sloping position which allows water to drain away from cavities.
Washware stays too long in the machine at the end of program.Take out washware as soon as cycle is completed to enable the ware to dry.
Stripes and staines on dishes or glasses.Rinse aid concentration too high.Reduce quantity (see instructions).
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 washware.Use appropriate racks to create a sloping position which allows water to drain away from cavities.
Insufficient rinse aid concentration causes stainesIncrease quantity (see instructions)
Machine with softener: Wrong type of salt used.Use only granular regeneration salt.
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 an energy management system which cuts out the energy consumer at a given point, or machine is interlocked with another energy consumer unit.Connect machine separately (call electrician).
Blown site fuse.Check site fuses.
Temperature probe rinse booster or tank defective.Call the after sales service.
Pressure transmitter rinse booster or tank defective.Call the after sales service.
The four button LEDs flash.Control defective.Call the after sales service.