System leaks, expansion vessel issues, or valve problems can cause pressure loss in the boiler.
If the boiler pressure keeps dropping, there may be water loss in the system, a problem with the expansion vessel, or a fault in the safety valve. Even small leaks in the radiator line can lead to the same symptom.
Simply adding water is not a proper solution. If the root cause is not found, the problem will return and may eventually damage other parts of the boiler.
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