This machine over heats after cycle ,water keeps boiling in the booster tank,have to unplug machine in order to stop from overheating ,when you turn the machine off it will continue to boil until you unplug the machine , water shoots out the washer arms,
Service man has replaced both computer boards and the problem still exists
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There are one or two hi-limit relays on the booster. One is on the front and if there is a second one, it is on the right hand side as you face the front of the unit. They are both manully have to be reset if tripped. Check them and also the booster's contacter
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As per my personal opinion this is normal because for the final rinse you have a small booster or boiler..
When you turn on the machine..it starts fill and also the booster for the final rinse.
You start the machine..wash cycle...rinse cycle..
Now..new water(from rinse booster) is coming on the tank in order to rinse the dishes..on the same time the machine drains the excces water from the rinse(over flowing) and fills up the booster with new water.
Should be like this
Most of the Hobart LX series of dishwashers have their own built-in booster heaters. To check for one, remove the lower front panel (2 screws). The booster heater, if present, will be a stainless steel tank on the left side. If it doesn't have a built in booster heater then it was meant to be used with chemical sanitizer instead.
All Hobart dishwashers will have a wash tank heating element, but the rinse water is not heated by the dishwasher, unless it has a built-in booster heater. Usually a separate booster heater is used to heat rinse water to 180-190 deg. F for hot water sanitation.
3 Con, is the booster heat contactor. If it is chattering, the fault will be in the booster. There are a few different boosters in the AM14. can you post the ML number from the data plate, or describe if the booster is a square Hatco HCM-10, or a round stainless booster with a 13 kw multi wired element.. All boosters use a low water cut off circuit, a high limit thermostat and a control thermostat. The old Hatcobooster uses mechanicqal components, where the new rount tank uses probes and a control board. The board has 3 leds. red is calling for heat, yellow is open thermistor, and green is shorted thermistor.
AM14's had a variety of different control circuit voltages, ranging from 240/208/120 and 24 volt AC. Check the transformer secondary for correct output to controls, trace through circuit until voltage pulses. If new style, it could be just scaled up probes not reading water. Drain the tank with the power off before removing probes.
Does it show a wrench icon and P1?
error codes are p 1to 3 for probe errors, or E1 to 7 for error codes.
P1 is the probe on the wash tank. It's a thermistor with two black wires to a white connector. There is another on the booster front (P2) and a 3rd on the rear airgap, (p3). You could try exchanging 1 and 3 to see if the fault changes too. You have to drain the booster to swap P2. If it can't determine the wash tank temp, it won't know to control the heat and shows the error.
145 degree is just your hot water temp and that your dishwasher hot water booster is not working assuming that this machine has worked in the past to produce final rinse water above 180 degrees. Remove the bottom panel and to the right you will see the booster tank, look for a nickel size component with a small red button on it. Try pushing on it to reset it. If that does not work, check for voltage at your heating element on your booster tank. (the thicker wires) If voltage is present then your heating elements need replacing.
The answer to this question will be based on the incoming water temperature that is supplied to the booster heater. The standard sizing for a booster heater is based off of a 40 degree F rise (140 degree F incoming water temperature) or a 70 degree F rise (110 degree F incoming water temperature). For a 40 degree F rise, a Hatco model C-5, S-5, or PMG-60 will supply the needed amount of rinse water for the LX-18 Hobart dishwasher. A 70 degree F rise would require a Hatco model C-9, S-9, or PMG-60 to supply the same Hobart model number.