Question about Aprilaire 700 Humidifier

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After one season the model 700 doesn't turn on

Aprilaire 700 last winter and it worked great. This season I changed the wick and now all of a sudden the thing doesn't turn on no matter what I set it at, or what the humidity in the house is.
What gives?

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  • Stephen Evans May 11, 2010

    This system works on 24 volts. take the cover off the humidistat and jump the 2 wires together. if it comes on when the furnace is running you need to replace the humidstat. Steve

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Clogged solonoid? clean filter and orifice

Posted on Jan 15, 2009

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1 Answer

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the float may be bad or sticking allowing water to run continusly even when unit is off.

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Aprilaire 700. It works on fan on mode but not otherwise. It's never on and the humidity reading is always way below the setting. It should turn on automatically to bring the humidity up, right?


It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.

Thank you for giving us the opportunity to be of service
Sincerely,

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www.aprilaire.com

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Dec 17, 2009 | Aprilaire 550 Humidifier

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The 700 will not start for this season. I called


reason why I asked they sometimes have a problem sensing current and you may need to wind the wire twice instead of one pass. If you jump the wires at the humidistat and the unit turns on its either the stat or you may want to do a relative humidity check on the house to see where your at

Best regards,
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Dec 13, 2009 | Aprilaire 700 Humidifier

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You have a faulty humidistat

Greg Sunsetmech

Dec 13, 2009 | Aprilaire 700 Humidifier

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Aprilaire 760 keeps running.


The humidifier should not turn on untill the furnace blower starts. Since the fan stays on. does the solenoid valve also stay on? If they both stay on you probably have a bad humidistat. If only the blower stays on then the circuit bourd in the humidifier is defective.
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Feb 06, 2009 | Aprilaire 700 Humidifier

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Nov 17, 2008 | Aprilaire 700 Humidifier

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FURNACE RUNNING LOUD


sounds like either the motor is off balance
or is going bad again
either way id be on the phone to the guy who did the rapair
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