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I have random pipe shocking heavyly.

I have random pipe shocking heavily while the fan was set at the auto. the shocking disappear when I turn off the heat system.

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It sounds like your solonoid valve on the humidifier was slamming shut cause the water hammer, no call for heat, no humidifer.

Posted on Jul 17, 2009

  • Keith Fournier Jul 17, 2009

    It sounds like your solonoid valve on the humidifier was slamming shut cause the water hammer, no call for heat, no humidifer.



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How to install an ace hardware saddle valve on 3/4" galvanized pipe?

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Aprilaire 550 clunks on shut off. Never did this before. Changed the saddle valve and Solenoid. Checked copper water line for possible vibration on a pipe, nothing. I'm stumped

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1 Answer

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2 Answers

Aprilaire 600 Humidifier


I had this problem several years ago. In order for the water to flow, the outside temperature sending unit must indicate to the controller that it is less than 60F. If not, the unit will not operate outside of test mode. Check the temp outside where your sending unit is (could the sun be heating that side of the house?) and ensure that the circuit to the sending unit is working. I had a bad wire splice inside a wire nut stopping the circuit. Took me a long while to figure it out.

If the outside temp and your sending unit circuit is ok, I wish you luck on your troubleshooting.


Nov 10, 2008 | Aprilaire 600 Humidifier

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