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No power to the solenoid valve - Aprilaire 600 Humidifier

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Check to you have 24 volts at transformer, if so then the problem could be the humidistat, if not the transformer is bad.

Posted on Jan 07, 2013

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1 Answer

Humidifier doesn't work


Hello, if there is water to the solenoid valve but not passing through it than the solenoid valve is malfunctioning and must be replaced. However, if there is no water at the solenoid valve then either the saddle valve or supply line is clogged with sediment. A easy way to chek the solenoid valve is apply power directy to the solenoid valve from the transformer, if it does not open then replace it.

Nov 17, 2011 | General Filters 1099-LH Humidifier

1 Answer

The water not reaching the humidirier and the fan runs couinnuously


Hello, water not reaching the humidifier can be caused sediment buildup in the strainer of the solenoid valve, a faulty solenoid valve, sediment at the saddle valve, or no power to the solenoid valve. The fan will run continously if the relay that engages the fan is stuck as it is gettimg a constant 120 volts.

Jul 06, 2011 | General Filters 1042-LH Humidifier

1 Answer

I have 24 volts coming from humidistat and 120 from plug to circuit board in humidifier. But nothing comes on even after i replaced the circuit board.


Hello, apply power directly from transformer to solenoid valve, if it does not come and let water through the solenoid valve than replace solenoid valve

Feb 11, 2011 | Aprilaire 700 Humidifier

1 Answer

My aprilaire 700 isn't coming on (no water flow). The front part of the unit has fallen off the furnace twice (held on by plastic nubs/slots...) and blew the furnace fuse/ and circuit breaker probably...


Check for voltaged at the solenoid valve. This will either be a 24 volt or 110 volt solenoid valve. Confirm power into the unit 110 volts. If you have power into the unit and no voltaged at the solenoid valve on a call for humidification at the humidistat than the circuit board or the step down transfgormer has failed.. If you do have voltage at the solenid valve than the valve has failed.

Jan 26, 2011 | Aprilaire 700 Humidifier

1 Answer

The solenoid for Model 600 was installed upside down--the inlet is closest to the floor. Is this OK? Also no in-line strainer. I confirmed water to the solenoid, but in Test mode w/ feeder tube...


The solenoid valve unit will work upside down however, I am concerned that the tech that installed the unit might have installed it backwards. Look on the side of the valve the solenoid is connected to and you should find an arrow. Thats the direction of the water flow.A strainer helps keep the valve clean however if there is dirt in the valve it would be stuck opened not closed. Make sure the solenoid is getting power via float valve. If the solenoid is getting power you can tell by touching the top of the solenoid with a metal non magnetic screw driver. It will pull the screw driver like a magnet. Good luck

Jan 15, 2011 | Aprilaire 600 Humidifier

1 Answer

I installed a new Aprilaire 700 and everything looks normal except there isn't ant water flow, I am not sure if this is the solenoid or transformer problems?


Check if you are getting 24 volts at the transformer, if you are then appy power directly to the solenoid valve from transformer, you should here the solenoid valve click and let water through. If not replace the solenoid valve. If the valve works by giving power directly from transformer the check the wiring, humidistat, and current sensing relay/sail switch.

Jan 10, 2011 | Aprilaire 700 Humidifier

1 Answer

My aprilaire humidifier model 500 series does not seem to kick in. I try moving the manual control when the furnace kicks in but even turning the control to the max nothing happens


Check to see if you are getting 24 volts at the transformer, if you are then bring the power directly from the transformer to the solenoid valve and see if the solenoid valve clicks open by moving the knob on the humidistat. If nothing happens then most likely the solenoid valve is bad and needs to be replaced. If the solenoid valve does work after bringing power directly to it then either tne problem is the humidistat it self or the sail switch/current sensing relay.

Jan 09, 2011 | Aprilaire 550 Humidifier

1 Answer

Solenoid on Aprilaire 600


solenoid valves dont just burn up just like that you have a recurring restriction due to bad water.Check the saddle valve at the water heater first then check for postive water flow at inlet to the solenoid valve,if you have water flow the valve is clogged with sediment.

Dec 13, 2008 | Aprilaire 600 Humidifier

1 Answer

Water does not get to Humidifier. Goes from source to motor.


That is not a 'motor' on the side of the humidifier housing, it is a solenoid valve. The water feeds in to one side and exits the other side to a tube that feeds in to the top of the humidifier unit. The valve opens and allows water to flow when electrical power is applied to the valve

The valve electircal requirement may be either 120 vac or 24 vac. Power typically is switched on and off by a Humidistat control. The power feed to the Humidistat may come from a small transformer if the valve is a 24 vac unit, or directly from a furnace connection if the valve is a 120 vac unit. There are many variations, though.

A qualified licensed eletrician should check the power feed to the valve. If there is no power feed to the valve then he can trace back to the point of failure and correct the issue ... but he must also check for additional issues with the valve itself, as noted below.

Other possibles reasons for solenoid valve failure:

If power feed to the valve tests ok, then the coil inside the solenoid may be 'open' (bad, no continuity). The electrician can test the coil by checking resistance or continuity of the coil.

A non-electrical problem is that the valve path may be blocked by hardwater mineral build-up or other foreign material that flowed through the water line.

The solenoid valve must be replaced if either of the above is true with your valve.

Remember, use only a quailified licensed electrician!

Nov 24, 2008 | General Filters 1042-LH Humidifier

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