Furnace humidifier dry as a bone. have changed the filter, duh, that is the only thing I know how to do! Bottom line, there is no water running through it.
Water has quit running thru the humidifier.
furnacehumidifier
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It is indeed condensate water, high efficiency furnaces wring water all year long (more so during heating, but A/C in summer too).
What has happened is the condensate collection point (on the inside of where the external PVC drain runs) has cracked. It is a very brittle and cheap plastic, just saw this on another customers furnace. It acts like a little trap, holding water until it overflows into the PVC to drain.
Possibly the PVC got kicked and the force made its way back to the box (good luck getting a show of hands for this one)..
In any case, your furnace vendor will likely have one in stock.
There's two ways to wire this up. The first method is to take advantage of the HUM terminal on the furnace control board. This terminal will supply 120 volts when the furnace is running in heat mode, so you'll have to use an additional transformer.
You'll hook the primary side of the transformer to the HUM, and Neutral terminals in the furnace. Then you'll connect the 24VAC terminals of the humidistat, to the secondary of the transformer.
The other method, is to use the furnaces transformer to provide power to the humidistat. However, you'll have to make sure the transformer is large enough to supply the load.
With this setup, you'll connect the 24VAC terminals of the humidistat to the C and W terminals on the furnace control board. That way when the thermostat calls for heat, the humidistat will be powered by the furnaces transformer.
Best Answer
Novice
Check the humidity
The humidifier should only turn on if the humidity is below a set level. Make sure the humidity is actually below this level.
Clean the inlet
Check the inlet (where the water comes in), and make sure it's not all gunked up.
Check the valve
If the humidifier supply line connects to the water supply via a saddle valve, close and reopen the valve (and consider replacing the valve, which will require shutting off the water since the valve pokes a hole in the pipe).
Set the humidistat
If a humidistat is used, make sure it's set properly.
Intermediate
Check for water at the solenoid
Close the valve supplying the humidifier, and remove the supply tube from the supply side of the solenoid. Open the valve just a bit, and make sure water is coming from the tube.
TIP: Wrap a rag/towel around the open end of the hose, and hold it tight when opening the valve. The rag/towel will prevent the water from spraying out the end of the tube. Also, don't forget to hold the rag/towel wrapped tube over a bucket.
Check for power at the humidistat
Open up the humidistat, and use a multimeter/voltmeter to make sure the humidistat has power (most likely 24 volts).
NOTE: Depending on the installation, the humidistat may only have power when the furnace is running.
Check for power at the solenoid
With the humidistat open, and the furnace running. Set the humidistat to the highest setting, and check to see if you have voltage going to the solenoid.