34 Installation instructions VRT 340f
11.2 Service/diagnostics level
Access the service/diagnostics level by
pressing the P button and the dial.
• Press the P button and the dial
simultaneously for approx. 3 seconds.
First, a heating request for 50 °C is
triggered to test communication with the
boiler. Then you can select all the test
options by pressing or rotating the dial.
When you press the P button the display
returns to basic mode.
11 Start-up
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