MEIKO Commercial Dishwasher Error Code ERR 203: No Level Change Emptying
ERR 203 on the UPster U 400 M2 display reads No change detected by the boiler level switch when emptying (with integrated pressure booster pump). The manual says it is not possible to continue working and to call a service technician.
High: the boiler cannot be emptied or checked, and the machine stops until it is repaired.
- Code
- ERR 203
- Maker
- MEIKO
- Equipment
- Dish machines
- Applies to
- Meiko UPster U 400 M2 glass and dishwasher, M001DWUC10M2-10
What does MEIKO error code ERR 203 mean?
When the boiler empties, the level switch should change state as the water drops. If the control sees no change while emptying, it shows ERR 203, No change detected by the boiler level switch when emptying (with integrated pressure booster pump). The manual lists the causes as a defective pressure booster pump, a disconnected plug connection, a defective start capacitor, a defective boiler level switch, and no signal to or from the pump and the I/O board. It states that it is not possible to continue working and that a service technician must be called. The control cannot tell by itself which of these is true, since the same missing change could come from the pump not running or from the switch not reporting. The display reads No change detected by the boiler level switch when emptying.
Affected models and control systems
This code is listed for the Meiko UPster U 400 M2 glass and dishwasher, type M001DWUC10M2-10, in section 9.6.1 Messages (the ERR table on printed pp. 34-35).
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 203 with the text No change detected by the boiler level switch when emptying
- Machine stopped and will not continue
- Water still in the boiler or no pump sound while emptying
Possible causes
Likely causes — what usually sits behind error code ERR 203 on this control. A technician confirms which one it is before any part is replaced.
- Pressure booster pump defective
- Plug connection disconnected
- Start capacitor defective
- Boiler level switch defective
- No signal to or from the pump and the I/O board
- Debris or scale blocking the pump or boiler outlet so emptying cannot complete
- Moisture or corrosion in a connector at the pump or switch
Safe checks before calling for service
- Switch the machine off and on once to see whether the code clears.
- Listen for the pump during emptying and note whether it runs.
- Check outside the machine that nothing has pulled a plug loose, without opening any panel.
- Do not keep restarting; write down when ERR 203 appears and whether the pump sound was present, for the service call.
How a technician diagnoses error code ERR 203
- Read the message history and confirm ERR 203 and any companion codes.
- Check the pump's plug and wiring for a secure connection.
- Test the start capacitor and the pump motor.
- Check the boiler level switch operation and its signal to the board.
- Check the pump and board signals.
- Replace the part that fails and run an emptying test.
- The pump, capacitor and board are at live voltage behind panels, and a capacitor can hold charge.
- The boiler holds hot water that can scald when opened.
- Telling a pump failure from a switch or board signal problem takes a meter and the machine's wiring information.
Technical reference
- Document
- UPster U 400 M2 Glass- and dishwasher - Original operating instructions (type M001DWUC10M2-10)
- Edition
- 9760441 / Valid from: 2018-02 / Update: 2026-06
- Models / control
- Meiko UPster U 400 M2 glass and dishwasher, M001DWUC10M2-10
- 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 working with ERR 203?
No. The manual says it is not possible to continue working. Call a service technician.
Will restarting clear it?
A restart may clear a brief glitch, but if the pump or switch has failed the code will return.
How does ERR 203 differ from ERR 204?
ERR 203 is no change seen during emptying. ERR 204 is no change seen yet after the rinse time ran out. They share the same causes.
Need help with MEIKO error code ERR 203?
A technician confirms the cause on site and gives you the price in writing before any work starts.