Question about GE Monogram ZDI15C Automatic Icemaker
Monogram repair manual
The manual is certainly worth $4 isn't it? Are you sure you did not damage the ice mold while extracting the fouled ice cube? I use a hair dryer (much safer). The water could be from a bad water valve(not closing quick enough). The ice maker itself make 3 attempts to fill the cavity. It does this by reading impedience from the voltage that is applied to the sensor. As the volume of water builds in the ice mold the resistance value changes. The brain gets a reading and determines if it has enough water in it.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. Note if you are on a reverse osmosis system then remove the IM from that system or you will continue to have problems with ice cubes being stuck in the ejecter.
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. POWER ON DIAGNOSITICS TEST MODE(on some models)
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 intented to be repaired.
Posted on Oct 03, 2009
Newer Monogram refrigerators have had a problem with leaking from the ceiling of the freezer due to a drainage problem of the defrost water during the defrost cycle. FIRST, be sure that the water isn't coming from ABOVE the icemaker in the seams of the ceiling cover before proceeding.
When ice jams in the ejector the gears of the drive motor can be stripped. This is likely what happened in your case. The best course is to change the whole icemaker which should cost you about $150. You will need the full model number which is usually located above the refrigerator compartment in the compressor compartment on a sticker that should be easy to find.
Replacement is fairly easy as it sounds like you have gotten well into the icemaker itself.
Posted on Oct 03, 2009
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Posted on Jan 02, 2017
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