Monogram Ice Maker OFF Light Flashes 3 Blinks Error Code

When the OFF light on a Monogram undercounter icemaker blinks three times, over and over, the icemaker is reporting a harvest failure.

How the control reaches this state

During harvest the control watches the evaporator thermistor. If the thermistor is still below 52 F after more than 16 minutes, the control goes into Harvest Failure Mode and the OFF light flashes 3 blinks. It stays in that mode until the failure is corrected.

Which icemakers

The guide covers the Monogram ZDIS150WSS, ZDIS150WBB and ZDIS150WWW. This is an older (legacy) series, so check the model label to confirm your unit is one of them.

What a technician checks

This is service-guide material, not an owner procedure. For three blinks the technician looks at:

• whether the evaporator thermistor is connected to the sealed-system tubing and fully connected at the control box (with the thermistor unplugged, the icemaker runs on a timed cycle);
• the thermistor’s resistance;
• a thermistor that is unplugged, open, loose or badly positioned;
• if the thermistor tests good, a hot gas failure, a sealed-system leak or a restriction.

The guide’s troubleshooting table lists the cause as a defective, loose or mispositioned evaporator thermistor, with the fix being to test the thermistor and wiring harness or reconnect.

Related blink codes

• OFF light, 2 blinks: the bin thermistor is open or disconnected, not the evaporator one.
• CLEAN light red: a different light, about cleaning the icemaker.

Monogram ice maker service, Los Angeles

For Monogram ice maker service in Los Angeles, call (844) 415-4997. Tell us it is the 3-blink OFF light and give the ZDIS150 model number from the label. See also the ice maker repair page.

Source: Monogram ZDIS150 icemaker technical service guide (31-9196)