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Error code · Stero · Dish machines

Stero Dishwasher Error Code LOW RINSE TEMP: Rinse Too Cool

LOW RINSE TEMP on a Stero dishwasher shows when the rinse temperature has been low for three consecutive cycles. The machine keeps running cycles. Check the incoming hot water, and call us if the message continues.

Medium · inspection needed

Medium: the machine keeps running, but a rinse that is repeatedly too cool needs attention.

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Code
LOW RINSE TEMP
Maker
Stero
Equipment
Dish machines
Applies to
SU-L / SU-H undercounter (and SG glasswasher)

What does Stero LOW RINSE TEMP mean?

The control checks the rinse temperature at the end of each cycle. It does not react to a single low reading. After two consecutive low rinse temperatures, the third consecutive low cycle brings up the LOW RINSE TEMP message. The machine continues to run cycles, so it does not stop on its own, which means the message is a warning to staff that the rinse is not reaching the temperature the machine expects. The message table gives no action, and the manual points to the troubleshooting guidance on water temperature. Causes usually sit upstream of the machine: a water heater that cannot keep up in a busy period, a hot water line that is too cool at the machine, or on the SU-H a booster heater problem. Because dishes still pass through the cycle, the message is easy to ignore, which is why it escalates.

Affected models and control systems

Stero dishwashers SU-L ML-130274, SU-H ML-130273, SG-40 and SG-42.

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

  • LOW RINSE TEMP shows after several cycles
  • The machine keeps running and washing racks
  • Dishes feel less hot coming out of the machine
  • The message appears during the busiest rush

Possible causes

Likely causes — what usually sits behind LOW RINSE TEMP on this control. A technician confirms which one it is before any part is replaced.

  • A building water heater that falls behind during heavy dish-room use
  • A hot water supply valve partly closed, so the machine receives less hot water

Safe checks before calling for service

✓ What an operator can do
  1. Check that the hot water supply valve to the machine is fully open.
  2. Ask whether hot water elsewhere in the kitchen is also cool.
  3. Let the machine rest between rack loads if cycles are being run back to back.
  4. Write down when the message appears and how many cycles in a row, and call us if it continues.

How a technician diagnoses LOW RINSE TEMP

  1. Read the display and confirm LOW RINSE TEMP and the number of cycles.
  2. Measure the incoming hot water temperature at the machine.
  3. Check the rinse temperature probe reading against a thermometer.
  4. On the SU-H, check the booster heater operation.
  5. Check for scale on the heating parts.
  6. Repair the heating part that fails its test.
! Leave this to a technician
  • Heater and booster tests involve mains power and hot water.
  • Telling a weak building supply from a machine problem needs temperature measurements.
  • The rinse probe and heaters need to be verified under a running cycle.

How LOW RINSE TEMP differs from similar codes

LOW RINSE TEMP appears after three low cycles. If the condition reaches 10 consecutive cycles, the message becomes LOW RINSE TEMP / Check Water Input.

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 RequiredBOOSTER TEMP SENSOR - Service Required - OPEN or SHORTStero Dishwasher Error Code BOOSTER TEMP 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 InputRINSE 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
LOW RINSE TEMPQuestions about Stero LOW RINSE TEMP
Does the machine stop on LOW RINSE TEMP?

No. The manual says it continues to run cycles.

What happens if I ignore it?

After 10 consecutive low cycles the message changes to include Check Water Input.

Is the problem always the machine?

No. The supply of hot water to the machine is a common cause.

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Need help with Stero LOW RINSE TEMP?

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

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