mypros+
Error code reference

U-Line Ice Maker Error Code E6

Thermistor 2 (Condenser/Liquid Line thermistor) is shorted.

U-Line codesU-Line ice maker codes

Thermistor 2 (Condenser/Liquid Line thermistor) is shorted.

First step from the service manual

Check thermistor 2 connections are clean and dry; measure resistance with ohmmeter.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for E6.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E6 means on a U-Line ice maker

The E6 error code on a U-Line ice maker indicates that Thermistor 2, the condenser or liquid line thermistor, has been detected in a shorted condition. A thermistor is a temperature-sensitive resistor whose resistance value changes predictably with temperature. When this sensor shorts, its resistance drops abnormally low, sending the control board a signal that falls outside the expected operating range. The board interprets this as a fault and triggers the E6 code to prevent the system from operating on bad temperature data.

Thermistor 2 is positioned to monitor the condenser or liquid line temperature, which is a critical measurement point in the refrigeration cycle. Accurate readings from this location help the control board regulate compressor operation and overall cooling efficiency. A shorted thermistor can cause the unit to mismanage its refrigeration cycle, potentially leading to poor ice production or complete shutdown of the ice-making process.

The most common causes of a shorted thermistor include moisture intrusion at the connector, physical damage to the sensor wiring, or internal failure of the thermistor itself. The first diagnostic step is to inspect the thermistor 2 connector for moisture, corrosion, or debris, and then measure the thermistor resistance with an ohmmeter. A shorted thermistor will show near-zero or zero resistance rather than the expected value for the ambient or refrigerant line temperature. If the wiring and connector check out clean and dry, the thermistor itself will likely need replacement.

Source: manufacturer service documentation.

Common causes of E6

  1. 01

    Moisture or corrosion at the thermistor connector

    Wiring / connection

    Water or condensation inside the connector pins can create a low-resistance path that mimics a shorted sensor. Inspect the connector for discoloration, rust, or visible moisture and clean or dry it before retesting.

  2. 02

    Failed thermistor 2 sensor

    Part replacement

    The thermistor itself can fail internally, causing its resistance to drop to near zero regardless of temperature. Measuring resistance with an ohmmeter will confirm this if the reading is at or near zero ohms.

  3. 03

    Damaged or pinched thermistor wiring

    Part replacement

    The wire insulation running from thermistor 2 to the control board can become pinched, abraded, or melted, allowing the conductors to contact each other and create a short. Trace the full length of the wiring harness and look for any visible damage.

  4. 04

    Wiring harness connector not fully seated

    Wiring / connection

    A partially disconnected connector can create intermittent or abnormal resistance readings that the control board registers as a short. Press the connector firmly until it clicks and re-test the unit.

  5. 05

    Control board fault misreading the thermistor circuit

    Part replacement

    In rare cases, the control board itself may have a damaged input circuit that incorrectly reports a short even when the thermistor and wiring are intact. This should only be considered after the thermistor and all wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about E6

What does E6 mean on a U-Line ice_maker?
E6 on a U-Line ice maker means that Thermistor 2, the condenser or liquid line temperature sensor, has been detected as shorted by the control board. A shorted thermistor produces an abnormally low resistance reading that falls outside the acceptable operating range. The unit flags this fault to prevent operating with inaccurate temperature data, which could damage the refrigeration system or result in poor ice production.
Can I fix an E6 error on my U-Line ice maker myself?
If the cause is simply a dirty or wet connector, a knowledgeable DIYer can disconnect the thermistor 2 connector, clean it thoroughly, allow it to dry completely, and reconnect it. Measuring thermistor resistance with an ohmmeter is also within reach for someone comfortable with basic electrical testing. However, if the thermistor or wiring needs replacement, or if the control board is suspect, professional service is recommended to avoid misdiagnosis.
Is it safe to keep using my ice maker when the E6 code is showing?
It is not advisable to continue using the ice maker while E6 is active. The unit is operating without reliable condenser temperature data, which can lead to improper refrigerant management and potential compressor stress. Addressing the fault promptly will protect the unit from further damage.
How much does it cost to fix a U-Line ice maker E6 error?
If only the thermistor needs replacement, parts and labor typically fall in the range of $75 to $200 depending on your location and service provider. If the control board is also involved, costs can rise to the $250 to $500 range or higher. Getting a diagnostic call from a qualified technician first is the best way to understand the specific repair cost for your situation.
Will resetting my U-Line ice maker clear the E6 error?
A reset may temporarily clear the E6 code, but if the underlying fault with Thermistor 2 still exists, the error will return once the control board runs its diagnostic checks again. Resetting the unit without repairing the cause is not a permanent solution. The thermistor connections, wiring, and sensor resistance should all be verified before relying on a reset to resolve the issue.

Related U-Line ice maker codes

All U-Line ice maker codes
View all 61 U-Line ice maker codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass