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ACCESS TO THE ICEMAKER CONTROL BOARD AND INTERNAL COMPONENTS — Remove the plastic plug at top of the cover to reveal and to remove the Phillips head screw holding cover in place.
ON/OFF SWITCH — Rocker switch mounted on right side of icemaker control housing.
GREEN LED INDICATOR LIGHT — Lens mounted on right side of cover to show power is on. Also used to indicate icemaker fault conditions, like an open or shorted thermistor, or a harvest cycle that takes longer than 30 minutes. Fault mode is indicated when the LED blinks 1/2 second on, 1/2 second off indefinitely until icemaker is turned off.
ELECTRONIC CONTROL BOARD AND INTERNAL COMPONENTS — The Electronic Control Board is secured by three Phillips screws within the control housing. All wiring uses plug-on terminals. The electronic control board contains two hall effect sensors (similar to electronic reed switches) which are activated by one magnet attached to the end of the ejector arm to determine if the motor has reached the "home" position and one magnet attached to the sensing arm to determine if the "feeler" or sensing arm has reached the fully extended position. (Ice has not prevented it from moving outward to the fully extended position).
THE SENSING ARM OR "PADDLE" moves laterally or horizontally (not up and down)
THE THERMISTOR is mounted in the mold body directly behind the control housing. It has two functions: 1) to measure ice temperature during freezing, 2) to determine water level during the fill cycles. (This icemaker can have up to 3 fill cycles: 1st fill is 5.1 seconds, 2nd fill, if needed, is 2.5 seconds and 3rd fill, if needed, is 2.4 seconds) The thermistor is looking for a temperature in excess of 39.6°F (4°C) to terminate the fill cycles. Once this temperature is reached, or is exceeded, the icemaker will start the freeze cycle. If after the third fill, and the temperature has not reached 39.6°F, the control will override this requirement and the icemaker will automatically enter the freeze cycle.
THE FREEZE CYCLE is the period of time where the icemaker is waiting for the cubes to freeze solid. This is based on an algorithm programmed into the electronic control board. The electronic control board makes these calculations once per second and monitors the thermistors' current or present resistance value as well as the rate of resistance change. This will take into account the various environmental conditions that vary the freeze times, such as control settings, door openings, room temperature, etc., but the average cycle is said to be 75 minutes to drop the 7 cubes in the icemaker mold.
THE HARVEST CYCLE begins when the freeze algorithm (programmed into the electronic control board) has been satisfied and the sensor arm is out or fully extended. If the arm is in the "in" position when harvest is to begin, a delay of 3 minutes will be added once the arm is moved to the extended position to allow for drawer type ice buckets to be removed for this amount of time without starting a harvest cycle. This 3 minute delay will begin again if the arm goes back to the "in" position anytime during the delay period. This arm is spring loaded to go to the "out" position unless it is being held in the "in" position by an obstacle such as an ice cube.
At the beginning of the Harvest Cycle, the mold heater will activate. One second later the motor will start. The heater will remain on until the mold temperature reaches 35.6°F (2°C) and a minimum of 20 seconds have elapsed. If necessary, the heater will cycle within a range of 32°F "cut in" to 35.6°F "cut out".
To assure that the motor makes a complete revolution, the control checks to see if the motor is not "home" for at least 10 seconds and the sensor arm is "in" for at least 10 seconds. When the ejector then reaches the "home" position, this completes the harvest cycle and the motor will turn off. If the harvest cycle, which consists of one complete revolution, is not completed within 7 minutes, the control will assume that a cube is blocking the completion of the cycle and will initiate a "Harvest Fix Mode". If the Harvest Cycle is not complete within 30 minutes, the electronic control board will assume some other problem occurred and will enter the "Fault Mode" which will cause the LED to start blinking in an 1/2 second "on" 1/2 second "off" pattern.
THE HARVEST FIX MODE occurs when the harvest cycle is not completed within 7 minutes, as mentioned earlier. This is achieved by raising the mold temperature to 68°F "cut off" temperature, with a 59°F "cut in" temperature. During this mode the motor will cycle off 10 seconds per minute of cycle time. If the motor reaches home position, a second revolution of the ejector will occur to verify that there is no more blockage. At this point, the control board will initiate another freeze cycle without a water fill to avoid a double shot of water from entering the mold. As mentioned earlier, the control will enter a Fault Mode if a harvest cycle (including a harvest fix mode) is not complete within 30 minutes.
POTENTIAL CAUSES FOR A HARVEST CYCLE TO TAKE LONGER THAN 30 MINUTES AND THUS ENTER A FAULT MODE (LED BLINKS):
Stuck ejector — caused by a cube that was not cleared or a mechanical problem. Bad heater — caused by open circuit, control board triac or thermal cut out. Bad motor — caused by open motor, or control board triac. Motor home position not operating — caused by control board or loose magnet (the result will be continuous ejector operation). Thermistor — open or shorted.
THE WATER FILL CYCLE occurs when the harvest cycle is completed and the icemaker is "pre-chilled" to 35.6°F. This pre-chilling of the mold allows the thermistor to better detect the level of the water. Water entering the icemaker mold will cause the mold temperature to change, effecting the resistance of the thermistor. The thermistor has a negative temperature coefficient. This means that an increase in temperature will cause a decrease in resistance.
The first fill cycle activates the water valve for 5.1 seconds. After this fill, there is a 15 second delay to allow time for the thermistor to "read" the water temperature and thus determine if the mold is sufficiently full. If the temperature exceeds 39.2°F (4°C) after this delay, the icemaker will end the water fill cycle and initiate the freeze cycle. The second fill cycle is initiated if the temperature is still below 39.2°F after the 15 second delay. This second fill will be only for 2.5 seconds, and again, another delay for 15 seconds will be made to allow time for the thermistor to determine if the temperature has reached 39.2°F (4°C). If so, the icemaker will end the water fill cycle and initiate the freeze cycle. The third and final fill cycle occurs after the 15 second delay if the thermistor detects that the water temperature still has not reached 39.2°F (4°C) . The third fill cycle lasts 2.4 seconds. After this, the icemaker control board is programmed to override this temperature requirement and will end the water fill cycle and proceed to the freeze cycle.
The point of all these fill cycles is to help compensate for low water pressure and hopefully avoid the "ice cubes stuck in the ejector" problems that is so common with low water pressure.
POWER ON DIAGNOSTICS TEST MODE
When the icemaker is first connected to power and the thermistor temperature is 50°F or more, the control will initiate a "Power On" test before entering the freeze cycle. The test will consist of the following sequence: 1)Turn on the motor until it reaches home position 2)Turn on the water valve for 1/2 second 3)Turn on the heater for 1/2 second 4)Verify that the feeler arm was in the "in" and then the "out" position. 5)Verify that the motor was not in the home position and then in the home position. 6)Verify that the motor does not remain on after being turned off. 7)Proceed to the freeze cycle.
SERVICE DIAGNOSTICS TEST MODE
During the first 15 seconds that power is first applied to the icemaker, the Service Diagnostics Test mode may be entered. The Service Mode is entered by pushing the feeler arm in and out three times within 15 seconds. (only three times). There will be only one fill cycle (5.1 second) in the service diagnostics mode without the waiting period for the mold to "pre-chill". If the icemaker has already started a harvest cycle and the arm is moving, it may be impossible to start the service mode. (since the NORMAL cycle is already started).
While in the "Power On Diagnostics" test mode, the "Service Diagnostic" test mode can be initiated and will override the "Power On Diagnostics" test mode.
This icemaker has no replacement parts available and is not intended to be repaired.
Info complements of Jim...thankx!!