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).
If
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%
OK.
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.
Posted on Feb 07, 2008
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.
Posted on Mar 07, 2007
The humidistat detected that the RH in the area of the sensor was as required or exceeded the setting as an upper limit
Posted on Mar 06, 2007
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i changed the filter at the begining of the season..no water goes to panel , when heat comes on , tried to to do test,no cliking sound from the seliniod.blew air on the humidstat sensor.help
A couple of issues. First, the unit doesn't seek to turn on unless I set the panel to the Test position. Once i do this, the water starts to flow, but never makes it thru the solenoid. I've cleaned and even removed the in-line strainer, but the water still never gets thru to the outlet hose.
I have a similar yet different issue. Sometimes there is no water going through the system (nothing coming out to the drain) which is accompanied (sometimes but not always) by a vibration in the pipe from the water heater to the unit. Any ideas what could be causing this?
My Aprilaire 760 doesn't turn on. The solenoid clicks and water begins to flow, but just a fraction of a second that, the solenoid clicks off. I just finished replacing the solenoid and...same problem. The solution lies somewhere else - but where?
brand new unit.
installed in manual mode
operates only in test mode.
will not turn on solenoid when turning dial off and then slowly back on
does not come on when blower operates and furnace operating.
Yes
I am not getting any water through the solenoid valve, even after I have taken it apart and cleaned it. It seems like there is no power to the unit at all.
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