ERROR E04 IN DELFIS GAS BOILER HOW TO FIX

As you can see, the display of Delfis gas boiler gives error E04.
The Barometer shows the pressure drop into the red zone. All you need is to turn the black faucet. The barometer arrow should go into the green zone. I will show you how to resolve the problem.
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If you have an opportunity to support our channel - we will be grateful for any help:
1) subscribe to the channel;
2) leave comments;
3) watch the video till the end;
4) share the videos;
5) donate:
PAYPAL/WISE: [e-mail]

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