Dashes on display - Coding values not shown or system address missing

What does Dashes instead of values mean?

The boiler display shows dashes instead of coding values (e.g., "000---") and system addresses (000:, 0B8:) are not displayed when trying to access coding level 2. This suggests a wiring or communication problem with accessories or the programming unit.

• Issues with external wiring or accessories (LLH, DHW, outdoor sensor, X6.1/6.2)
• A room thermostat incorrectly connected to X6.1/X6.2
• Electromagnetic interference affecting the programming unit
• Defective programming unit console

Click steps to track your progress.

1. 1

   Check all external wiring and ensure accessories like LLH, DHW, and outdoor sensors (specifically X6.1/6.2) are properly installed and wired.

2. 2

   Ensure no room thermostat is connected to terminals X6.1 and X6.2, as this is a common mistake.

3. 3

   Turn the boiler off and on a few times, verifying the VR20 board is properly installed with good contacts.

4. 4

   Verify the proper installation of the programming unit console onto the boiler.

5. 5

   If electromagnetic interference is suspected, consider using a remote wall-mount base for the programming unit wired into X6.1 and X6.2.

6. 6

   If the problem persists, replacement of the entire programming unit console may be necessary.