Meiko UPster U 400 M2 Error Code ERR 301: Tank Fill Cycles Exceeded
ERR 301 on a Meiko UPster U 400 M2 means the number of circulation pumping cycles for tank filling was exceeded, or the tank level analysis was disrupted. Check the water supply and the feed hose, clean the inlet filter and the rinse nozzles, and call us if it returns.
Medium: the tank does not fill properly, so the machine cannot complete a normal cycle.
- Code
- ERR 301
- Maker
- MEIKO
- Equipment
- Dish machines
- Applies to
- UPster U 400 M2
What does MEIKO error code ERR 301 mean?
Before it washes, the UPster U 400 M2 fills its tank, and the control checks the water level by running circulation pumping cycles and reading the result. The control allows only so many of these cycles to reach the right level. ERR 301 means that limit was passed, or that the level reading was disturbed during the fill. In plain terms, the tank is not reaching its level in the time the control allows. The simplest explanations are on the supply side: a closed valve, a kinked feed hose, or a clogged inlet filter that lets only a trickle through. Rinse nozzles blocked by scale can distort the flow and the level reading too. The last suspect is the tank level sensing itself. The maker's steps are to check the water supply and the feed hose, clean the inlet filter and the rinse nozzles, and to call a technician if it comes back. Since the detergent is in the water, wear gloves when cleaning the nozzles.
Affected models and control systems
This is for the Meiko UPster U 400 M2 glass and dishwasher. Other Meiko models and controllers use different error numbers for filling problems.
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
- ERR 301 on the display
- Tank that fills slowly or never reaches level
- Pump cycling repeatedly before the wash starts
Possible causes
Listed in MEIKO's documentation
- Water supply valve and the feed hose
- Inlet filter clogged
- Rinse nozzles clogged by scale
- Tank level sensing
Other likely causes — what usually sits behind error code ERR 301 on this control. A technician confirms which one it is before any part is replaced.
- Supply pressure dropping at busy hours, so the fill takes too long
- Scale built up in the nozzles from untreated hard water
- Level sensing tube fouled by detergent residue
Safe checks before calling for service
- Check the water supply and the feed hose for kinks or a closed valve.
- Clean the inlet filter, as the maker says.
- Clean the rinse nozzles. Wear gloves when cleaning, because the water holds detergent.
- Restart and watch the tank fill.
- Call us when ERR 301 comes back after these steps, and tell us how long the fill took.
How a technician diagnoses error code ERR 301
- Read ERR 301 and time a tank fill.
- Check supply valve, pressure and feed hose.
- Inspect the inlet filter and solenoid for debris.
- Check the nozzles and manifold for scale.
- Test the level sensing against the actual water level.
- Replace the valve or sensor only after the test.
- Testing the fill valve coil and level sensing means meter work on live 208-240 V wiring.
- Judging the tank level reading needs the machine's own readout during a fill.
- Heavy scale in the wash system may need descaling chemicals that must be handled with care.
How error code ERR 301 differs from similar codes
ERR 302 and 303 are about the tank failing to drain, while ERR 301 is about failing to fill.
Technical reference
- Document
- UPster U 400 M2 Original operating instructions 9760441 (update 2026-06), 9.6.1 Messages p.33-35
- Edition
- 9760441 / Valid from: 2018-02 / Update: 2026-06
- Models / control
- UPster U 400 M2
- Section
- 9.6.1 Messages: INFO table printed p. 33, ERR table pp. 34-35 (of 50)
- 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 MEIKO dish machine error codes
Can I keep running with ERR 301?
Not until the tank fills properly. A short fill gives a poor wash.
Will it clear after I clean the filter?
Often, if the inlet was restricted. If not, the level sensing needs a look.
Is this a drain problem?
No. Drain issues show as ERR 302 or 303.
Need help with MEIKO error code ERR 301?
A technician confirms the cause on site and gives you the price in writing before any work starts.