Meiko UPster U 400 M2 Code INFO 420/520: Incorrect Password
INFO 420 and 520 on a Meiko UPster U 400 M2 mean an incorrect password was entered or there is no authorization for that menu. Enter the code again, carefully. If you do not know the code, ask the manager or whoever maintains the machine.
Low: a menu access notice only; the machine keeps working.
- Code
- INFO 420/520
- Maker
- MEIKO
- Equipment
- Dish machines
- Applies to
- UPster U 400 M2
What does MEIKO error code INFO 420/520 mean?
The UPster U 400 M2 protects its service and setup menus with a code, so that only the right people change settings such as temperatures, times and dosing. When someone enters the wrong code, or tries to open a menu their access does not allow, the control shows INFO 420 or 520. It is a normal notice, not a breakdown, and the washing function is unaffected. Most of the time the cause is human: a mistyped digit, a code the person was never given, or an attempt to enter a menu above their job. Rarely, a keypad that registers the wrong keys gives the same message even when the correct code is typed. The maker's step is simply to enter the code again. Guessing repeatedly is not a good idea, since settings changed by mistake can affect how the machine heats, doses and rinses. If the code is unknown, the manager or the person who maintains the machine should supply it. If the keypad really seems to enter wrong numbers, a technician should look at it.
Affected models and control systems
This applies to the Meiko UPster U 400 M2 glass and dishwasher. Other Meiko models and controllers use different notices for menu access.
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
- INFO 420 or 520 on the display
- A menu that will not open
- Keypad entries that seem to be rejected
Possible causes
Listed in MEIKO's documentation
- Code typed wrongly
- Code not known to the person using the machine
- Attempt to enter a menu that needs authorization
- Keypad that registers wrongly
Other likely causes — what usually sits behind error code INFO 420/520 on this control. A technician confirms which one it is before any part is replaced.
- Code changed by the manager and not passed on to the shift
- Worn keypad where one key needs a hard press
Safe checks before calling for service
- Enter the code again, carefully, as the maker says.
- Make sure you are in the menu your job allows.
- Do not guess repeatedly. If you do not know the code, ask the manager or the person who maintains the machine.
- If the keypad seems to enter wrong numbers, note which key and call us.
How a technician diagnoses error code INFO 420/520
- Read the INFO number and confirm the menu being opened.
- Check the code with the owner.
- Test each keypad key for correct response.
- Check the keypad connection to the panel.
- Replace the keypad only after the test.
- Service menus hold the machine's own settings, and wrong values can affect heating, dosing and rinsing.
- A keypad that misreads keys is a panel part inside the cabinet near live wiring.
- Recovering a lost code can require the maker's service procedure.
How error code INFO 420/520 differs from similar codes
420 and 520 are about menu access, unlike the ERR codes that report water, heat or door problems.
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
Does INFO 420 mean the machine is broken?
No. It only says the code was wrong or access was not allowed.
Can I keep washing?
Yes. Washing is not affected.
What if I forgot the code?
Ask the manager or the person who maintains the machine before trying more guesses.
Need help with MEIKO error code INFO 420/520?
A technician confirms the cause on site and gives you the price in writing before any work starts.