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Sometimes, the pressure of the boiler decreases by falling water in the boiler. We can understand this by looking at the pressure gauge of the boiler. The filling cock is also a part of the boiler to solve such problems. When the pressure of your combi drops below 1bar, it ensures that the water of the combi is completed.
Codes: 0020212572, 0020217545
Suitable Models:
Protherm: Panther 12, Panther 25, Panther 30, Panther 35