Stero Dishwasher Error Code LOW RINSE TEMP / Check Water Input
LOW RINSE TEMP / Check Water Input on a Stero dishwasher means the rinse temperature has been low for 10 consecutive cycles. The machine continues to run cycles. Check the incoming water supply and temperature, and call us if it persists.
Medium: the machine keeps running, but 10 low cycles in a row point to a supply or heating problem.
- Code
- LOW RINSE TEMP / Check Water Input
- Maker
- Stero
- Equipment
- Dish machines
- Applies to
- SU-L / SU-H undercounter (and SG glasswasher)
What does Stero LOW RINSE TEMP / Check Water Input mean?
This is the second stage of the low rinse warning. After repeated low rinse temperatures, the display first shows LOW RINSE TEMP. If the low temperature occurs for 10 consecutive cycles, the message changes to add Check Water Input. The machine still continues to run cycles. The added words tell the operator to look at the incoming water, since 10 cycles in a row suggests the supply and not a single bad rack. The manual's action is to check the incoming water supply and temperature, and to contact service if it persists. In practice that means looking at the hot water valve, the water heater and the supply line, and on the SU-H, the booster heater. The message is a prompt, not a lockout, but 10 low cycles means 10 racks of dishes may not have been rinsed as hot as intended.
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 / Check Water Input shows on the display
- The machine keeps running cycles
- The message came after a series of low rinse messages
- Dishes come out cooler than normal
Possible causes
Likely causes — what usually sits behind LOW RINSE TEMP / Check Water Input on this control. A technician confirms which one it is before any part is replaced.
- A water heater that has failed or been turned down
- A closed or partly closed hot water valve or a blocked inlet screen
Safe checks before calling for service
- Check that the hot water supply valve to the machine is fully open.
- Run hot water at a nearby sink and see whether it gets hot.
- Ask the kitchen manager to check the building water heater.
- Note how long the message has been showing, and call us.
How a technician diagnoses LOW RINSE TEMP / Check Water Input
- Read the display and confirm the Check Water Input stage.
- Measure the incoming water temperature and pressure.
- Check inlet screens and the supply valve.
- Check the rinse probe against a thermometer.
- On the SU-H, test the booster heater.
- Repair the failing part or report a building supply problem.
- Temperature and pressure measurements are made on live plumbing and electrical parts.
- A building water heater problem belongs to the facility, and we tell you when that is the cause.
- Heater tests involve mains power.
How LOW RINSE TEMP / Check Water Input differs from similar codes
Check Water Input is the escalated stage of the same low rinse warning that begins with LOW RINSE TEMP after three cycles.
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.
Related Stero dish machine error codes
When does the message change?
After 10 consecutive low rinse cycles.
Does the machine lock out?
No. The manual says it continues to run cycles.
What does Check Water Input mean?
It tells you to look at the incoming water supply and temperature.
Need help with Stero LOW RINSE TEMP / Check Water Input?
A technician confirms the cause on site and gives you the price in writing before any work starts.