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Error code reference

U-Line Ice Maker Error Code R Zone T Open

Right zone thermistor circuit is open.

U-Line codesU-Line ice maker codes
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What the R Zone T Open error code actually means

Your U-Line ice maker is showing this error because the temperature sensor on the right side of the unit has lost its electrical connection to the control board. The machine cannot read the temperature in that zone, so it has stopped operating normally to protect itself. This usually points to a loose wire connection or a faulty sensor that needs to be replaced.

Diagnostic procedure

The full R Zone T Open procedure

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First diagnostic step
Check connection. Replace if necessary.
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Most common causes of R Zone T Open

Ranked by how often they cause this code
  1. 1Loose or disconnected wiring connector
  2. 2Failed thermistor
  3. 3Broken or damaged wire in the sensor lead
  4. 4Corroded connector pins
  5. 5Control board fault

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Questions people ask about R Zone T Open

What does R Zone T Open mean on a U-Line ice_maker?
R Zone T Open means the control board is detecting an open circuit in the right zone thermistor, which is the temperature sensor for that section of the unit. The board cannot read a valid resistance value from the sensor, so it cannot monitor temperatures correctly. This is typically caused by a loose connector, a broken wire, or a failed thermistor.
Is it safe to continue using my U-Line ice maker when this error appears?
You should not continue using the unit while this error is active. Without a functioning right zone thermistor, the control system cannot properly regulate temperatures, which can lead to inadequate ice production, food safety issues, or further component damage. Address the fault before resuming normal operation.
Will resetting my U-Line ice maker clear the R Zone T Open error?
A reset may temporarily clear the error code from the display, but it will return as soon as the control board polls the thermistor circuit again and detects the same open condition. The underlying cause, whether a bad connection, broken wire, or failed thermistor, must be physically diagnosed and repaired before the error will clear permanently.
Can I fix the R Zone T Open error myself?
If the cause is simply a disconnected or loose wiring connector, you may be able to resolve it by reseating the connector yourself. If the thermistor has failed or a wire is broken, replacing those components requires basic electrical skills and a multimeter to confirm the fault. Control board replacement should generally be handled by a qualified technician.
How much does it cost to repair the R Zone T Open error?
If only a wiring connection needs to be reseated, there may be no parts cost at all. A replacement thermistor typically costs in the range of $15 to $60 depending on the specific part. If a control board replacement is needed, parts and labor costs can range from $150 to $400 or more.

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