Error code
Description
Flow and return reversed
5x flame loss
Communication fault
Communication error with the PCB
Blocking input in locked-out mode
If present: Test error in HRU/WTW unit
Maximum temperature of the control unit exceeded
8.2 Error history
1. Access the menu level by pressing the two keys on the right simulta
neously.
2. Select the Failure menu by pressing the
key.
3. Press the or key to scroll through the error code history.
4. Press the
key to access the details of the error code displayed.
Fig.53 Accessing the menus
MW-5000009-4
Fig.54 Accessing the menus
MW-5000011-1
Fig.55 Accessing the Failure menu
MW-5000043-2
8 Troubleshooting
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