Ours was doing this. Then a big bubble arrived in the top of the crappy one tube towel rad on the first floor. Bleeding that off when the system was off seemed to quieten it down.
Any way to encourage said bubble?
@stevo_com started
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Ours was doing this. Then a big bubble arrived in the top of the crappy one tube towel rad on the first floor. Bleeding that off when the system was off seemed to quieten it down.