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Error code · Stero · Dish machines

Stero Dishwasher Error Code BOOSTER TEMP SENSOR: Service Required

BOOSTER TEMP SENSOR with Service Required and OPEN or SHORT on a Stero SU-H dishwasher means the booster temperature probe is out of range. The machine continues to run cycles. Contact your service provider; the service number is on the display.

Medium · inspection needed

Medium: the machine runs, but the booster temperature cannot be confirmed until the probe is repaired.

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Code
BOOSTER TEMP SENSOR - Service Required - OPEN or SHORT
Maker
Stero
Equipment
Dish machines
Applies to
SU-L / SU-H undercounter (and SG glasswasher)

What does Stero BOOSTER TEMP SENSOR - Service Required - OPEN mean?

The SU-H has a booster heater that raises the rinse water to its final temperature, and a probe in the booster reports that temperature. If the probe reading goes out of range, the display shows BOOSTER TEMP SENSOR, Service Required, the service phone number and OPEN or SHORT. The manual marks this message as SU-H only, so other models in the family do not have a booster probe. The machine continues to run cycles, but a booster the control cannot read may not heat the rinse as intended. The manual's action is to contact the service provider. The OPEN or SHORT wording says whether the probe circuit is broken or bridged, which tells the technician whether to look for a loose connector or damaged insulation.

Affected models and control systems

Stero SU-H ML-130273 dishwasher only. The manual lists the booster temperature probe message for the SU-H; the manual says SU-H only.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

  • BOOSTER TEMP SENSOR and Service Required show on the display
  • The service phone number is displayed
  • The machine keeps running cycles
  • LOW RINSE TEMP may follow

Possible causes

Likely causes — what usually sits behind BOOSTER TEMP SENSOR - Service Required - OPEN on this control. A technician confirms which one it is before any part is replaced.

  • A booster probe connector loosened by heat and vibration
  • A probe lead damaged where it passes the booster tank

Safe checks before calling for service

✓ What an operator can do
  1. Note the display text, including OPEN or SHORT.
  2. Check whether LOW RINSE TEMP has also appeared, since the booster sets the final rinse temperature.
  3. Do not touch the booster or open any panel, because it holds hot water.
  4. Call the number on the display or call us, and give the model and the message.

How a technician diagnoses BOOSTER TEMP SENSOR - Service Required - OPEN

  1. Read the display and note OPEN or SHORT.
  2. Measure the booster probe resistance.
  3. Inspect the lead and connector.
  4. Check the booster heater operation.
  5. Compare the probe reading with a thermometer.
  6. Replace the probe or repair the wiring.
! Leave this to a technician
  • The booster is a heated, pressurized water vessel with mains-powered heating.
  • Probe tests need the machine powered down and the booster cool enough to handle safely, and replacing a probe means opening a pressurized, heated vessel.
  • Booster work affects the final rinse temperature, so it is verified under a running cycle with a thermometer.

How BOOSTER TEMP SENSOR - Service Required - OPEN differs from similar codes

The booster temperature message applies to the SU-H only, unlike the wash and rinse sensor messages.

Technical reference

Maker documentation
Stero owner support
Edition
ST50406 (01/16)
Models / control
SU-L / SU-H undercounter (and SG glasswasher)
Section
Operation, DIAGNOSTIC / ERROR MESSAGES (manual p. 18)
Checked
October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.

→Same maker

Related Stero dish machine error codes

BOOSTER LEVEL SENSOR - Service Required - OPEN or SHORTStero Dishwasher Error Code BOOSTER LEVEL SENSOR: Service RequiredDoor OpenStero Dishwasher Error Code Door Open: Door OpenedDRAIN ERROR - Service RequiredStero Dishwasher Error Code DRAIN ERROR: Service RequiredFILL ERROR - Service RequiredStero Dishwasher Error Code FILL ERROR: Service RequiredLOW RINSE TEMP / Check Water InputStero Dishwasher Error Code LOW RINSE TEMP / Check Water InputLOW RINSE TEMPStero Dishwasher Error Code LOW RINSE TEMP: Rinse Too CoolRINSE TEMP SENSOR - Service Required - OPEN or SHORTStero Dishwasher Error Code RINSE TEMP SENSOR: Service RequiredSUMP LEVEL SENSOR - Service Required - OPEN or SHORTStero Dishwasher Error Code SUMP LEVEL SENSOR: Service RequiredWASH TEMP SENSOR - Service Required - OPEN or SHORTStero Dishwasher Error Code WASH TEMP SENSOR: Service Required
BOOSTER TEMP SENSOR - Service Required - OPENQuestions about Stero BOOSTER TEMP SENSOR - Service Required - OPEN
Does my SU-L have a booster probe?

The manual lists this message as SU-H only.

Does the machine stop?

No. It continues to run cycles.

Is it related to LOW RINSE TEMP?

It can be, because the booster sets the final rinse temperature.

Book a visit

Need help with Stero BOOSTER TEMP SENSOR - Service Required - OPEN?

A technician confirms the cause on site and gives you the price in writing before any work starts.

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