Question about Aprilaire 700 Humidifier

3 Answers

Water not getting to panel when furnace is on

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?

Posted by on

  • 5 more comments 
  • Anonymous Dec 07, 2007

    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

  • Hawk22 Dec 07, 2007

    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.

  • scubascout Dec 11, 2007

    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?

  • bsn33m Dec 14, 2007

    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?

  • Anonymous Dec 18, 2007

    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.

  • Anonymous Dec 23, 2007

    Yes

  • GP09 Jan 11, 2009

    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. 

×

Ad

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 4 Answers

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

Ad
  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 11 Answers

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

Ad

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

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

If i hook my Aprilaire 400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to...


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.

Jan 31, 2013 | Aprilaire 400 Humidifier

2 Answers

House is dry though it's quite cold outside and furnace is running. Aprilaire is turned up to 35 (I have a dial, not a digital panel). the water panel is completely dry (should it be?)


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

Feb 05, 2010 | Aprilaire 700 Humidifier

1 Answer

Loud vibrating noise when the furnace blower starts up.


Try closing damper slightly between humidifier and furnace????

Feb 03, 2010 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 600 humidier: water continuously runs


sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Jan 08, 2010 | Aprilaire 600 Humidifier

1 Answer

Honeywell HE260 leaks somewhere


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.

Dec 28, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

No water going to furnace humidifier


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?
Good luch
HVAC Teacher

Mar 04, 2009 | AutoFlo 400BP Humidifier

1 Answer

Water keeps running to Honewell 360A Whole House Humidifier


You may need to replace the valve that is wired to the furnace that controls the water flow

Feb 01, 2009 | Honeywell HE360A1027 Whole House...

1 Answer

Water runs when furnace is off, but stops when furnace is on.


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.

Jan 28, 2009 | Aprilaire 700 Humidifier

1 Answer

Honeywell furnace humidifier thermostat & other


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.

Jan 16, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Aprilaire 110


Modle 110 has a relay in it see if it is stuck.Hope this helps

Nov 05, 2007 | Aprilaire 600 Humidifier

Not finding what you are looking for?
Aprilaire 700 Humidifier Logo

544 people viewed this question

Ask a Question

Usually answered in minutes!

Top Aprilaire Humidifiers Experts

Paul Carew

Level 3 Expert

3328 Answers

Mack Baxter

Level 3 Expert

383 Answers

1STHVACMAN

Level 2 Expert

69 Answers

Are you an Aprilaire Humidifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...