Sime super 90 making high pitched humming, whining noise when there is a demand for DHW. as soon we open the hot water tap the noise get louder and louder. it does not do that when the CH on. the pressure is 1 bar.
no it does not. it only make the normal noise of water running in a pipe. but the noise I talking about start as low then increases fast as the modulator works due to DHW demand
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