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There's a hot water wall-hung radiator in my kitchen that produces a constant ticking noise when water is flowing. The noise is coming from the valve area, removing the thermostat does not influence the noise. Pushing the little rod on the valve with the thermostat removed only makes the noise louder.

I recorded the noise, amplified it and placed it here.

Is this noise indicative of a defective valve? enter image description here

  • Hello, and welcome to Stack Exchange. With the thermostat in place, does the noise change when you change the thermostat setting? (A picture of the thermostat and valve would help; edit it into your question.) – Daniel Griscom Dec 13 '16 at 21:58
  • I added a picture of the thermostat & valve in my original post. Turning the thermostat knob does not influence the noise, but I have a strong suspicion the thermostat itself may be broken (the pin-pusher floats freely. I don't think that's supposed to be the case) – Ives Dec 14 '16 at 8:00
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That's an odd noise, it sounds like something's loose inside the pipe and rattling around. Might be a piece of rust or gunk. If you remove the thermostat head and press the rod down completely, the rattling should cease because the valve is closed and there's no water flow. If the noise continues, that indicates the valve isn't closing properly.

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