Stero Dishwasher Error Code FILL ERROR: Service Required
FILL ERROR with Service Required on a Stero dishwasher means the unit timed out before it was completely filled. The machine will not operate and only allows power down. Contact your service provider; the service phone number is shown.
High: the machine will not operate until the fill problem is fixed.
- Code
- FILL ERROR - Service Required
- Maker
- Stero
- Equipment
- Dish machines
- Applies to
- SU-L / SU-H undercounter (and SG glasswasher)
What does Stero FILL ERROR - Service Required mean?
Before a wash, the machine has to fill its tank and, on the SU-H, the booster. The control gives the fill a limited time. If the unit times out before it is completely filled, for example with low water in the booster or a time-out within any cycle, the display shows FILL ERROR, Service Required and the service phone number. Unlike the sensor messages, this one stops the machine: it will not operate and only allows power down. That is a protective response, since washing with too little water can damage heaters and pumps. The manual's action is to contact your service provider. Typical reasons are on the supply side, such as a closed valve, but the manual does not list causes, so we treat them as likely only.
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
- FILL ERROR and Service Required show on the display
- The machine will not run and only allows power down
- The tank is low or empty
- The service phone number is displayed
Possible causes
Likely causes — what usually sits behind FILL ERROR - Service Required on this control. A technician confirms which one it is before any part is replaced.
- A water supply valve closed or low pressure so the fill never completes in time
- A fill valve or inlet screen blocked by debris from the supply
Safe checks before calling for service
- Check that the water supply valve to the machine is open.
- Look at the tank through the door without reaching into it, noting how high the water is.
- Power the machine down and up once.
- If the message returns, note the model and level, and call us or the number on the display.
How a technician diagnoses FILL ERROR - Service Required
- Read the display and confirm FILL ERROR.
- Check supply pressure and the inlet screen.
- Test the fill valve operation.
- Check the level sensing or pressure switch that confirms fill.
- Check the booster fill on the SU-H.
- Repair the part that fails.
- Fill valves and level switches carry mains voltage in a wet area.
- Telling a supply problem from a valve problem needs pressure readings.
- The machine is locked out until it is repaired, so the cause must be proven.
How FILL ERROR - Service Required differs from similar codes
FILL ERROR means the machine could not fill, while DRAIN ERROR means the level will not come up. Both stop the machine.
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
Can I run the machine after FILL ERROR?
No. The manual says it only allows power down.
Is the supply valve the first thing to check?
Yes, because a closed or restricted supply is a common reason for a fill time-out.
Will a power cycle clear it?
It may allow a retry, but a repeat means the fill system needs service.
Need help with Stero FILL ERROR - Service Required?
A technician confirms the cause on site and gives you the price in writing before any work starts.