I detected that while my furnace was running, there was no water delivery to the humidifier water panel - that is, the solenoid valve had not triggered. When I moved the humidistat dial to "test/reset", the solenoid activated and water began to flow and continued to flow during the heating cycle. The dial setting was returned to its normal position (35%) during this time as well. During the next heating cycle, however, the same scenario ensued - no water delivery to the panel. I sought some professional advice and was told that there was a high probability that the solenoid was either defective or clogged in some way. I replaced the solenoid valve with a new one (the old one was not clogged in any way and inlet and outlet tubes were both clean as well) and am still having the same issue. Evidently, the problem is not the solenoid but something else. I'm thinking perhaps that the humidistat panel itself may be defective in some way. Any ideas?
I had a problem quite similar to this. It was the power connector.
This is the 4-pin white connector that engages when the cover is
removed/replaced when accessing the water panel.
One of the pins was
loose in the connector thereby supplying intermittent 24 volt power for
the solenoid that
is powered by the fan motor control board transformer in the humidifier
cover next to the fan motor (not seen unless fan is dissembled).
you are technical such as I am this is easy to fix by removing the
connector, removing the loose pin, and often each retaining clip on
the connector pin can be bent out slightly, then replace the pin, and
then it should be fine. Also, it's best to check this out on a bench
while running the entire unit. You also might need to replace the
entire power connector. Sometimes it's easy to think the problem is a
defective solenoid or fan motor/transformer board, etc. It's
frustrating, because sometimes the humidifier works perfectly, and then
sometimes there is no water flow. Since I did this mine has been 100%
NOTE: IF YOU ARE NOT TECHNICAL DON'T EVEN ATTEMPT TO FIX THIS PROBLEM,
CALL IN A PROFESSIONAL TECHNICIAN. LETHAL VOLTAGES ARE PRESENT IF THE
FAN CIRCUIT MOTOR CONTROL BOARD IS EXPOSED. ALSO, MUCH OF THIS IS
FRAGILE. IT COULD
BECOME COSTLY IF YOU MESS UP.
Assuming that your humidistat panel in on the cold air return, I would remove the panel and check that some lint or dust possibly is stuck to the sensor. Also check the operation of the solenoid easily when the furnace is running by turning the dial back and forth and you can hear the solenoid open and close.
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Your humidifier is a bypass type. The only voltage needed is 24vac to open the water valve. Air only flows through the humidifier when the furnace blower is running, and the wet pad will add very little humidity if the furnace is not running and heating the air before flowing through the wet pad in the humidifier.
It is best the water valve is only energized when the furnace is running. Some furnaces have a connector on their control boards labeled HUM for this purpose. Test it's voltage when the furnace is running because some will output 110vac instead of 24vac you need.
unless the humidty in your home is higher then 35%. if it is then the humidifier would not run. try turning it up higher and see if it comes on. Do you hear a click in the humidistat? as you turn up the dail when you hear the click is when the humidifier should come on. Also remember your furnace must be running for the humidifier to come on. if you hear the click and the humidifier fan comes on but no water, you may have a clogged inline filter located in the solinoid valve or a bad soliniod. all parts for your humifier can be purchased from www.aprilaire.com
Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.
The furnace should be equipped with a #50 relay to turn the Humidifier on and off when only when the furnace blower is on. You should have a test mode on your humidistat. Do you have water coming up to the solenoid valve? Make sure that the saddle valve is turned on to supply the water to the humidifier. Is your humidistat set high enough to turn the humidifier on? Is it plugged in?
the 760 humidifier does not need a transformer wired externally. the 760 has its' own 24v transformer inside the fan compartment. this transformer will provide the power to enrgize the water solenoid as needed. it sounds like to me the additional trasnformer is hot all the time. when the furnace comes on, the unit gets power and the internal transformer is cancelling the power from the external transformer. this would explain why it quits running when the heat is on. since the external transformer is hot all time, when the heat shuts off, the solenoid is getting energized by the external transformer. to make this run correctly, you need to get rid of the external transformer. leave the humidifier high voltage wires hooked up so they are only hot when the furnace runs. if you have a humidistat that has a r and c terminal, you will need to wire these directly to the r and c on the furnace control board and move the switch inside the humidistat to "power". make sure it is not on "bypass". then wire your 2 brown wires from the humidifier to each of the "h" terminals on the humidistat. if you have a humidistat that only has 2 terminals, wire one brown wire to each of the terminals. this should allow it to run properly.
sounds like to me you have a condensation pump attached to your hvac system. this can be used to pump water produced during the cooling of your house when in the a/c mode. if you have a typical bypass humidifier, you will have excess water running past the water panel and it must be sent to a drain of some kind. I would imagine the pump is being used to get your bypass water to the drain. another scenario may be that you have a 90% condensing furnace. if your exhaust pipe for the furnace is made out of pcv pipe, it is a condensing gas furnace. it will produce water when it is running. the water if from the combustion gases being condensed in the secondary heat exchanger. this is normal. some condensing gas furnaces will draw combustion air from inside the house and some will have a second pvc pipe that is used to pulll combustion air from the outside of the house. either way, it is not dehumidifying your house. the humidifier should be able to keep up if it is runnng properly. you should have water running out the bottom drain of the humidifier any time the fan on your furnace is running and the humidistat is calling for humidity. if this is not happening, it is not wired properly.