I can't get the ice machine to start. No water flowing to the tank. I cleaned the unit including the float valve and checked continuity of float switch which works. No beeps from unit. No noise at all. The red LED power lamp is lit on control board. Any other areas to check? I think it may be the inlet water valve but how do I check it?
I don't have a wiring diagram for this machine so I can't be specific, but I may be able to offer a few suggestions. Check for voltage on the coil by slipping the two wires back off their coil connections you should be able to expose enough of the connection to measure voltage. If voltage exists when machine should be filling, you either have a bad coil, or water is not reaching this point. Check coil resistance by removing wires and testing coil. Resistance reading of 0 or O/L (out of range) would be grounds for replacing the coil.
If coil tests good, look for plugged water filters on water line leading to machine.
Hope this helps,
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Have a look at the side of the evaporator; there is a probe (thermistor) attached to it that tells the control board when to initiate the harvest cycle. make sure it's clean and attached properly and doesn't need replacing. If hitting the float switch initiates the harvest cycle it sounds like you have a blocked/ scaled water tube or switch housing. take off the bottom of the switch assembly (black rubber bit) and clean through to the water chamber. run a cycle of descaler before trying again.
cycle is, fill cycle for 1 minute first. If there is not water entering the unit when first turned on, look for that issue. Water turned off, water valve not working or some restriction, clogged water filters, etc. That is got to happen first. Don't over look the bin stat being bad. Nothing happens if teh bin stat is bad. It sends voltage to the control board that runs the unit.
Look for a stuck float switch. unit fills with water for 1 minute, then the board "looks" at the float to "see" if there is enough water in the unit to run. If float switch is stuck down, it tells the unit there is not enough water and the unit stays in the fill cycle causing the sump to overflow and send water down the drain constantly. Compressor will not run till the board senses that there is enough water to run.
Hoshizaki machines must have a very clean evaporater other wise the ice will bind causing a slow harvest. This may be from lime scale build up. "Lime A Way" is recommended for this proper cleaning. After that is done check to see that the water inlet valve screen is clean and that you have a filter installed. Last check the thermister attached to the suction line. http://www.hoshizakiamerica.com/techtips/Pdf/All/tips105.pdf
several things cause freeze ups.
If you have water filters on the water system, be sure they are not restricting the water flow. water flow pressure should not go below 20 psi.
The bin stat may not be shutting off the unit properly. It should shut off machine within 10 seconds of ice making contact.
Make sure the float switch is not dirty. Be careful when cleaning. Fragile
Make sure water pump runs the entire time it is in the freeze cycle.
Be sure the evaps are clean. Ice cubes will hang on if not clean.
Water solenoid has a screen where the water line screws on to it. Turn off water and check screen to be sure it is clean. This can restrict water flow.
Make sure water valve closes all the way. Turn machine off and see if water is still running. Valve may be leaking water thru.
Dip switches on the board, #1 and #2. Turn them both on and it will change the defrost time to 3 minutes. If both are off, they are set on 1 minute.
(Quated From Hoshizaki Technical Bulletin) An alarm code of 3 beeps every 3 seconds means that the control board has shut down on the 60 minute freeze cycle back up timer.
The “E” control board has a 60 minute timer that starts at the beginning of the freeze cycle. If the float switch fails to open and start the next harvest within 60 minutes, the board will automatically start the harvest cycle. If this occurs in two consecutive cycles, the control board will shut the unit down on the manual reset, freeze cycle back- up timer. The yellow fault LED marked “60 min.” will illuminate. This safety is designed to help prevent a freeze up of the evaporator.
Once you have identified the 60 minute alarm, there are several things to check. Reset the alarm by depressing the white reset button to the right of the fault LED’s. This must be done with the power “ON”. Now check the float switch to see if it is stuck in the up position. A stuck float can occur if scale is present on the reed switch shaft inside the housing. To check it, drain the water reservoir, unplug the black float switch connector (K5) from the control board and check it with an ohm meter for a closed switch (zero ohms). If the float switch is sticking, clean it with ice machine cleaner or replace it as necessary. An inlet water valve which is slowly leaking by during the freeze cycle can cause a 60 minute alarm. If the inlet water valve is stuck wide open, it is unlikely that any ice will form on the evaporator. Check for a slow leak by allowing the unit to cycle into the freeze cycle and disconnecting the hose at the outlet of the water valve. If water leaks by during the freeze cycle, the water valve diaphragm is likely damaged or the small diaphragm bleed port is clogged with scale. Clean the bleed port or replace the diaphragm or entire water valve as necessary.
(I Recommend to get a refrigeration tech for this part).
Another possibility is a refrigeration system problem. You should use normal refrigeration diagnosis procedures to check for one of these problems. If the thermostatic expansion valve is not feeding properly or the refrigerant charge is low, the evaporator will not form ice as it should and a long freeze cycle will occur. This could also be the result of the hot gas valve not closing completely during the freeze cycle or if the compressor valves are weak or inefficient. An inefficient compressor however, will usually show up first on the KM model through a longer than normal harvest cycle. This is because of cooler than normal discharge gas. Use proper refrigeration practices to repair a refrigeration system problem. While these are not the only reasons for a 60 minute freeze cycle, they are the most common and should be checked to resolve a 3 beep/yellow fault LED alarm.