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- 20 Nov 2022
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Whenever I turn the heating on or simply run hot water (from any tap), within 5 seconds of the burners igniting, my Viessman Vitopend 100 boiler gets loud, like an airplane taking off. This lasts for about 5 seconds, then it stops.
You can hear it here: https://streamable.com/9v8h97. (At the 20-second mark, the burner LED goes on, and about 5 seconds later you can hear the noise.)
My insurance sent a repair guy over who claims it's limescale buildup in the heat exchanger and proposes replacing the heat exchanger. (A new one is 600€, which is probably more than what my entire boiler's worth.) This would not be covered by my insurance (it's only for smaller repairs), so I asked if we could try descaling it, but he refused (without an explanation).
Is it the heat exchanger? If so, could I descale it myself?
Full disclosure: My boiler has also been having pressure problems so I will be replacing the expansion vessel and the pressure relief valve, but I don't know if this could be related.
You can hear it here: https://streamable.com/9v8h97. (At the 20-second mark, the burner LED goes on, and about 5 seconds later you can hear the noise.)
My insurance sent a repair guy over who claims it's limescale buildup in the heat exchanger and proposes replacing the heat exchanger. (A new one is 600€, which is probably more than what my entire boiler's worth.) This would not be covered by my insurance (it's only for smaller repairs), so I asked if we could try descaling it, but he refused (without an explanation).
Is it the heat exchanger? If so, could I descale it myself?
Full disclosure: My boiler has also been having pressure problems so I will be replacing the expansion vessel and the pressure relief valve, but I don't know if this could be related.