Water runs to the solenoid, but doesntt pass through it... Do I need a new solenoid?

Is there 24 volts at the solenoid valve when blower motor is running? If there is water at the inlet side of valve then either the solenoid is bad or it is not receiving 24 volts.

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.

the solenoid allows water to flow to jet that then runs down the pad the solenoid is control by the stat

To test solenoid, apply 24V directly to the terminals as see if water flows through it. Alternativly, turn everything on, ensure that there is 24 volts accross the solenoid wires, if you show 24Volts and no water, solenoid is bad. To test you will need to set your meter to AC Volts.
If you have a separate black transformer supplying the 24 volts, hook that directly to the solenoid. You may also be getting the 24Volts from your furnace circuit board, if that is the case you will see two terminals usually marked HUMIDIFIER on the furnace circuit board (you will need to open your furnace usually 4 screws or so.) There is 24 volts there WHEN THE HEAT IS ON , run two new wires from those terminals to the solinoid and see if it passes water cuz that is when those terminals have voltage. Best way is with a meter though and if you have 24 volts at the solenoid AND no water, it is bad. If NO VOLTS, then could be the the humidistat or a disconnected wire somewhere in the path.

I DO NOT HAVE SOLUTION BUT I HAVE SAME PROBLEM HELP PLEASE

check to see if you have 24 volts between to 2 yellow wires coming out of the water solenoid. if you have 24v, then it is still getting energized to run. if it does not have 24v and the water is still running, the solenoid is stuck open. most likely from water deposits. sometimes you can take the solenoid apart and clean it, but probably better off just getting a new solenoid.

Thanks for your question,
first you need to determine if you have 24 volts from the transformer, if you have knowledge of electrical meters then this should be fairly easy, if not then you will need to do a little rewiring to find out if it is the solenoid, first you will need to do is shut the power off to your furnace, then get some t-stat wire, long enough to reach from the solenoid to the transformer, splice together the new wire to the wire from the solenoid, now take the other end of the wire, take the leads off the transformer (low voltage side) and hook the new leads to it, make sure the water is on, now turn the furnace back on, and if the solenoid is good the water will flow, if it doesnt, then you will need to replace the solenoid, if the solenoid does work then you know your problem lyes with the Humidistat, and you will have to replace that, but you need to determine if you have 24 volts from the transformer first, hope that helped, let us know and please rate this, thanks again ,
mr.grzz

Thanks for your question,
Sounds to me like you have a bad solenoid valve in your Humidifier, this will need replaced, the solenoid is supposed to open and close when there is a call for humidity only when the furnace is running, then when the proper amount of humidity is sensed by the humidistat, then will it shut off, with the solenoid not working it will let water flow through like an open faucet, the solenoid is the componet that the 1/4in copper tubing connects to at the humidifier, has two wires running from it, you will need to shut the power off before changing this out, also shut the water off at the valve at the other end of the 1/4in copper line, or you might get soaked,please be careful when installing the new solenoid, making sure the water line connection is secure, or you will have leaks, hope this was helpful, please leave a rating, thanks again for your question,
mr.grzz

could also be a clogged filter or orifice. take input line off solonoid and check.clean filter, blow thru orifice. clean with small needle or buy new one.

Easy fix: Check the solenoid. Turn off the power to your humidifier and the central air unit. On the side of your humidifier is a brass solenoid. It can get clogged with lime and calcium. Most videos and instruction manuals tell you to replace the solenoid. No need if you can turn a wrench.

1. After all power is off turn the water off to the humidifier and disconnect the top line water line at the nut.

2. Disconnect the bottom line water line that will go to your humidifier.

3. Take a Philips screw driver and remove the two screws that hold the solenoid on the side of the plastic housing of the humidifier.

4. Leave the wires connected unless you need more room to work. If you disconnect the wires then label them with tape (colored) so you put them back on correctly.

5. In the inlet or outlet water pip of the solenoid is a trainer that may be clogged. With a paper clip pull it out and clean it. If it’s clearly clogged then stop and put all back together. That may have been your problem.

6. If it’s not clogged then it may be clogged inside the solenoid.

7. The nut on the end of the solenoid is silver. Take it off and the magnet (main power unit) will slide off.

8. Notice the flat head screw post on the end of the solenoid. Turn it and remove. Be careful as a small spring loaded plunger is inside.

9. Take apart and clean all parts. You should be able to blow air in the intake water line tube and it go out the out water line tube as well as were the plunger hits in the center of the solenoid. If not then it’s clogged.

10. If clogged then just soak all but any parts with rubber or plastic in a small white vinegar solution for a couple of hours to eat away that lime. If it’s not clogged then you probably have a bad solenoid.

11. To check and see if the solenoid is bad just put it all back together but do not re-wire the solenoid to the humidifier.

12. Turn on everything without the wires going to the solenoid (turn on meaning put power back to the unit.

13. When the system is running as it should without the humidifier and solenoid wires attached check the two lead wires with a volt meter for 24v. If you have 24v then you have a bad solenoid and need a new one. If no 24v then you may need a new control panel.

Hope this helps you out.