I have a model 700 with the automatic controller. It has operated fine for 3 years, but just changed to heat 2 weeks ago and is not operating. I checked it in test mode and nothing happens other than the controller green light blinks as is normal for test. The solenoid does not click, no water appears and the fan does not run. I checked voltages and the R/C terminals have the correct 24 volts. There is no voltage to the unit from the H terminals, whether idle or running in test. the ODT terminals show 5 volts. Should the H terminals show 24 volts when in test mode to activate the humidifier? I suspect the controller is the issue. Any fixes or just replace?
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Sorry to read about your problem, I hope this helps you out. did you hit the reset
Digital Humidifier Control (Model 700): (Automatic or Manual mode) Check system operation and reset Change Water Panel indicator by setting the knob to "Test/Reset". With HVAC blower operating and HVAC calling for heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
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However, assuming that you have done that in the recent past, you probably want to know more. I'm not sure how this actually works (that is why it shows CF). I saw it for the first time after 2 or 3 years of using my humidifier. (And I had just changed the filter a week or so previously).
You may have to turn the unit off/on or even unplug it to clear the message, then it should operate normally.
It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.
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Turn the control knob to the
“Test/Reset” position until the “Change
Water Panel” light blinks to reset the
water panel change indicator timer.
(Blower must be operating and furnace
calling for heat.) Be sure to turn the
control knob back to the prior setting when finished
if it is set up right, you should be able to run your fan 100% of the time and the humidifier will come on when there is a need for humidity. you can experiment with leaving the fan on and see if this helps. it will run your electric bill up a little and also you will have a lot of waste water. that is a drawback to the bypass type humidifiers. also a factor is if the water supply is hooked up to the hot or cold side. it will humidify better on the hot side, but you tend to get more deposits that plug the solenoid over time and you will be running your water heater quite a bit. 1600 sqft may be pushing the limit of this humidifier.
Thanks for your Question, Sounds to me like you have a calcium build up in the Solenoid, which is restricting flow to the unit for proper operation, you might even have a bit of restriction in the copper line feeding the Solenoid, replacement of the solenoid would probably take care of your problem, one quick tip, in the spring and summer months, its a good idea to shut the water off to the unit, this should make the Solenoid last a little longer, hope this was helpful to ya, please let me know, thanks again, mr.grzz
I can't exactly recall--once I fixed it, I erased it from my memory! However, you need to have power off to check continuity; at least on my meters I'll blow its little internal fuse if there is any voltage. As I recall, one of the main indicators for switch failure was that the switch failed to click/engage. Hope this helps. I was able to contact their tech services to get advice.
The reset is to place the controller in the "test/reset" position. The furnace must be in heat mode and operating at the time. The green light will blink for about 1 minute if operating properly, then cut off when placed in a normal setting.