Question about Aprilaire 600 Humidifier

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We just bought a house with an existing Aprilaire 600 humidifier. It is now heating season and we ae running the furnace. I turned on the humidifier and no water is getting to the pad.The water line is ok leading to the solenoid and the inline strainer is clear, but no water gets through the solenoid outlet side so it appears it is not opening. I cannot hear any clicking sound when I turn the manual humidifier dial on and off. Do I need to replace the solenoid? Or is there another problem?

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Hello,Make sure the heating blower/fan is running when you turn the dial as the humidifier might not have power if there is no heating blower operation.

Posted on Nov 06, 2010

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I replaced the water panel on our aprilaire 600 humidifier. I adjusted the thermostat to call for heat to test it. When the dial (non-digital control panel for the humidifier) is turned to test/reset,...


Thank you for contacting us with regards to your model 600 Humidifier. The Change Water Panel indicator should flash when the control knob is set to the Test/Reset mode. The flashing indicates that the timer has been successfully reset. However, the humidifier should operate for the first 60 seconds of Test mode as long as your furnace is running. If your humidifier does not turn on, contact your installer. The humidifier may require service.
We appreciate the opportunity to be of assistance.
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Brett Phillips
Technical Support
Research Products Corporation

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