How to get water automatically in the Ice Maker?
Is the user interface display related to this problem?
Which specific part is responsible to send the signal to the core control board so the ice maker can be filled up?
Does the ice maker sends the signal to the core control board to be filled with water?
How does it work?
My client is having a problem with the Ice Maker.
I have done all tests that could be done and no clues what to do next.
I check the ice maker service pointer and the service bulletin & wiring sheet, did all and nothing yet resolved.
Here is what it was done:
The first thing done was checking the two inlet valves voltage, the ISO valve is working fine with 120V AC and the second double valve IM is also working well.
The freezer light door switch works fine, bucket switch and main switch are ok.
Then, in the service bulletin in step 44 the ice maker harvest and returns to home position.
In step 45 the water fill test to the ice maker was also working fine.
The problem I am having is when you exit the service mode, the ice maker doesn’t fill with water automatically, it is needed to be filled manually with water at the service mode step 45 each time.
Also have verified the water lines if they were clogged and they were fine.
First, the ice maker was not moving neither was filling up with water when you perform step 44 and step 45 in the service sheet. In this type of appliances most of them are found with frayed and broken cables, so I look forward in this one and found out that indeed the cables were frayed and broken, solder them and the ice maker worked again.
I always had water in the dispenser even with broken/ fray wires.
After that, I performed the service sheet steps that are related to the ice maker
1. FC thermistor: 01= Pass
2. RC thermistor 01= Pass
6. Defrost heater/Bi-metal: 01 Bimetal Closed.
16. RC Door Switch Input: 01 and 02 works both fine.
17. FC Door Switch Input: 01 and 02 works well.
18. Ice Door Motor: 01,02,03 and 04 are all fine.
19. Fill Tube Heater status: 01, 02 ok.
39. Dual Evan Thermistor: 01= Pass.
44. Sankyo Icemaker Harvesting Test: starts with 2, then you do the test with SW3 switches to 1 and the ice maker harvest well and the lever works fine.
45. Sankyo and LPIM Icemaker Water Fill test:
starts with 2 and with SW3 the ice maker harvest and then moves to 1 and then with SW3 moves to 03 and fills up with water.
47: 01 it on valid temp warmer than harvest temp
48: 02 always, I have checked with meter for continuity and it works well, if you don’t push the bucket switch the ice maker harvest does not work.
The problem now I am having is that in normal operation mode the ice maker does not fill automatic so there is no ice production, only if it is filled with water by the service mode, only makes 10 cubes and if it is not filled again in servir mode there is no ice production.
I have also check the heater for continuity and it has 14V DC, all the wires that connect the ice maker to the core control board work fine with continuity.
If I disconnect the Core control board P3 tan cable and work it manually it works and dispense water to the ice maker as it should.d
In this case what could be the problem?
Do you have a video for this model?
- Guest asked 3 years ago
Hello
See the ice maker diagnostics link below for your ice maker. I would go to the flow chart on page #4 and go through the flow chart diagnostics. This chart will take you step by step on each component testing and diagnostics.
The Twist-Tray Ice Maker (IM) is a 10 cube ice maker manufactured by Sankyo. It is a single unit with no replaceable parts. The IM operates with DC voltages of 14VDC and 5VDC, and water pressure between 30 and 120 psi. It produces around 3.5lbs of ice per day (4lbs per day if MAX ICE is enabled).
IM timing and logic is controlled by the UI Core Control Board. The IM has the following operational components (Figure 1):
• DC Motor with bi-directional movement
• Bail Arm to sense ice level in the ice bin
• Internal feedback switch to determine motor position
• Thermistor
The DC motor twists the ice tray. Ice is detached by the twisting motion, no heater is needed. The motor also operates the bail arm. The bail arm, and the internal feedback switch, checks if the ice bin is full.
The internal feedback switch helps determine if the ice bin is full and monitors motor shaft
position.
The thermistor senses the temperature of the ice tray to determine if the water is frozen.
(Below 8°F (-13°C) for Normal Ice, 5°F (-15°C) for Max Ice.
The IM has five standard states during normal operation. They are:
1. Homing
2. Filling
3. Freezing
4. Ice Ready
5. Harvesting
Other states include Homing Paused, Harvesting Paused, and IM Jammed.
Homing
When power is initially applied to the IM, it will enter the Homing state. 14VDC is applied to the motor driving it counterclockwise (CCW). The internal feedback switch closes when the ice tray reaches the home (fill) position.
If the IM is not in the Home position after 45 seconds, the IM will enter the Jammed state. The IM will attempt Homing every 60 minutes while in the Jammed state. Filling IM filling is skipped for the first cycle following a power interruption to the refrigerator. This ensures the IM is not overfilled, and results in a 3 hour wait for the first batch of ice to drop.For subsequent cycles, 115VAC is applied to the IM water valve solenoid for 15 seconds, filling the IM with 3.38 fl. Oz.(100ml) of water.The water fill tube has a heater to prevent icing of the fill tube following Filling. At the beginning of the Filling state, the filltube heater, if on, will be turned off. After filling completes, a 20 minute delay timer will begin. After these 20 minutes pass, the fill tube heater will turn on for 90 minutes, or until the beginning of the next fill cycle, whichever comes first. During periods where the IM is inactive (turned off, full ice bin, etc.) it is possible for the fill tube to freeze over. After the IM becomes active again, it may take one or two cycles to thaw the ice maker inlet tube line. Freezing After the 15 second fill time, the IM enters the Freezing state until the ice cubes are ready. The ice cubes are ready after time and temperature requirements are met. Time and temperature requirements vary between normal ice mode, and MAX ICE. In normal ice mode, the thermistor temperature must be at or below 8°F (-13°C). In addition, a minimum of 85 minutes must pass. If the RC or FC door is opened during the Freeze state, the timer is paused until the door is closed and additional time is added. For example, if the FC door is opened for 5 minutes, the timer stops for 5 minutes and 5 minutes are also added to the 85 minute timer for a total of 95 minutes.
In MAX ICE mode, the minimum timer is decreased to 70 minutes, but the thermistor temperature must be at or below 5°F
- AV Repair Help answered 3 years ago
- last edited 3 years ago
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Hello After your reply, I have done the complete test and these are the results: Path 1 – Ice Maker Operational Checks (Steps 44 & 47) Sankyo Icemaker Ice Tray Thermistor Test 1) Run Service Diagnostics Step 47 2) If the test indicates either an open or shorted thermistor, replace the IM. (The result was 01 so it is ok! Sankyo Icemaker Harvesting Test 1) Ensure the ice bin is not full to ensure test runs to completion. 2) Ensure the ice bin has a cutout as shown in Figure 4. The bail arm can be obstructed by the ice bin if this cutout is not present. 3) To run Diagnostic Step 44, make a jumper wire from the male portion of the power switch connector to simulate the connection between the power switch harness and the switch itself (Figure 5) 4) Run Service Diagnostics Step 44, allowing up to 1 minute for test results. 5) At the beginning of the test, verify the bail arm is coming down and is not obstructed by the ice bin. 6) Check that any ice cubes fall during the harvest cycle. Check for ice jams. 7) If the test result indicates a faulty switch or motor, proceed to the next step; otherwise proceed to alternate troubleshooting paths as required. 8) Remove the wiring connector at the IM (Figure 6). 9) Run Service Diagnostic Step 44 and check for 14VDC at the female IM Plug Motor pins (Figure 7) THE RESULT TEST WAS WHEN THE ICE MAKER HARVEST THE VOLTAGE IS 12.60VDC AND NOT 14VDC AS THE SERVICE MANUAL MENTIONS. According what I saw the Ice Maker is of 12VDC 5W. IF THIS IS HAPPENING WHAT COULD BE THE PROBLEM? IT IS RELATED TO THE ICE MAKER NOT FILLING WITH WATER? Sankyo water fill test: Dual water valves 120VAC when the 45 step is applied. Manufacturing Reset Routine Before replacing the UI, perform the Manufacturing Reset Routine to reset the User Interface and Control Box settings. 1) Unplug the refrigerator, then plug the refrigerator back in. 2) Open FC Door for 10 seconds, and then close the door. 3) Open RC Door for 10 seconds, and then close the door. 4) Simultaneously press and hold SW1 and SW2 for 3 seconds. All UI indicators will illuminate. 5) Wait until the UI displays “-5” 6) Unplug the refrigerator, then plug the refrigerator back in. 7) If the IM is still not working correctly, replace the UI. WHEN PRESSED THE SW1 AND SW2 FOR 3 SECONDS TRIED TO PERFORM SERVICE RESET BUT NO UI DISPLAYS -“5” IS THIS COULD BE ALSO WHY THE ICE MAKER FILLING DOES NOT WORK?
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Check the wiring at the bottom of the door and make sure they are good. They could be intermittently breaking connection when door is opened and closed. The door would need replaced to fix the broken wires. We have attempted to repair the wires but they break again eventually. There was also and issue on some units with the door switches not being engaged all the way when the door is closed. Try taping the doors switches closed in the freezer and see if that gets the ice to produce. At that point you would be looking at the ice maker or main control. I would start with the ice maker, it would be more likely.
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Hi Brian: I followed your advice and checked again the wiring at the bottom of the door with my meter, the white cable that goes to the connector of the Ice Maker was intermittently breaking whenever the door was open and closed . Now that is working again I will leave it that way and later on I will change the door. I am glad that the Ice Maker is working again, thanks for your help!
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I’m glad you found the issue and were able to get some ice again!
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Indeed Brian! Thanks again
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