HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

I have an aprilaire 600, red light on controller flashes

Customer Question
i have an aprilaire 600...
i have an aprilaire 600, red light on controller flashes continuously and coincides with a clicking sound from the controller. Manual temp resistor reads 44K, voltage is 27v. dont know why it clicks continuously when its on any setting except off
Submitted: 1 year ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 1 day by:
1/6/2016
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,805
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

Hello,

I apologize for the delay. I just logged on and saw that no one had picked up your question yet.

Do you still need assistance?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
I do
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

do you have wired in series with a pressure or sail switch?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
the humidifier has been installed and in use for 10 years and none of the wiring has changed over that time period. it just recently started the clicking sound from the controller and it occurs when the Red LED flashes on the controller board.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

I understand that...and all parts have been there for 10 years. But I need to know what you have for control as the humidistat is only one part. Many units have an air switch in the same circuit...so what I need to know is once the wires leave the humidifier do they go to humidistat and then something else?...or ONLY furnace humidifier and humidistat?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
all wires come out of the furnace in one jacketed cable and run directly to the controller except the Red wire. That wire is split out of the bundle and is spliced to the solenoid that allows the water to flow into the humidifier. so the Red wire is broken and the solenoid is wired in to the Red wire circuit. I have not look inside the furnace to see where those wires are attached.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

Thank you, ***** ***** things!

Now all we need to know is if inside the furnace...the red wire runs from:

a transformer attached to HUM terminal

a current sense relay wrapped around a blower wire

or direct from a HUM terminal on circuit board

Then we should be close to wrapping up.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
here is the wiring that is in place
Wires coming from the furnace: Red and White wires are connected to a solenoid of some kind and dead end there. Its a brown plastic box about 3" x 1" x 1". The other end of the red wire goes to the water solenoid and then to the controller board. The white wire runs directly to the controller board
The blue and yellow wires come out of the dead man switch in the furnace, to a small transformer and then to the controller board in the humidifier to connections labeled R and C.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

thank you.

Now first..check the transformer wires that go from transformer to board and the blue and yellow that feed the transformer. Make sure all are tight and secure.

Then the brown plastic box....can you see any numbers on it or post a pic of it?....this is something in the series we need to check

Ask Your Own HVAC Question
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

Thank you!,,,that is a current sensing relay. It allows 24v to humidistat only when the blower is running.

Now as a test...remove the 2 wires that go to the yellows...and attach the 2 wires direct as though the current sense relay is not there.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
i removed the current sense relay from the circuit by connecting the white and red wires together that go to the two yellows and it made no difference. the Red light on the controller board still continuously flashes and the clicking sound is still there as well. other ideas?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

remove the wires that feed from the transformer.

temp place on the furnace terminals R and C

Ask Your Own HVAC Question
Customer reply replied 1 year ago
out of town for a few days, will check when i get back later this week.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

keep me posted when you return

Ask Your Own HVAC Question
Customer reply replied 1 year ago
i looked at the furnace controller board and could not find any terminals labeled R and C. That is what you wanted me to do, correct? To take the wires off of the transformer and connect them directly to the furnace controller board.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

ok yours are separated and labeled prob different.

R is 24v on left side of board with red wire. Then you see the light blue wires from left bottom of transformer..those are "c' or "common".

But you are correct.....run a wire from transformer red bottom right and transformer common bottom left blue wires and apply direct to solenoid

Ask Your Own HVAC Question
Customer reply replied 1 year ago
i connected directly , bypassing the xformer, and ensured that the terminals on the furnace board had 24v. when connecting directly to the Humidifier board the same red light flashing and clicking noise was there. There was not change to the original issue.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 1 year ago

thank you. are the wires you hooking direct to the 2 wires coming out of the solenoid?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
the water solinoid? No, i bypassed the transformer in the furnace and took the blue and yellow wires from it and connected them to the 24V and ground ( red and blue wires) on the furnace control board. they then run to the humidifer board.
Customer reply replied 1 year ago
no, they were not. i bypassed the xformer and connected the two wires from go from the Humidifier control board( yellow and blue) to the 24V on the furnace control board. I dont think the solenoid is the issue as when I set the humidifier to run it will do that and water goes to the pad but the load clicking noise is present.
Ask BillyHvac Your Own Question
BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,805
22,805 Satisfied Customers
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics

BillyHvac is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

6,877 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
My Lennox humidifier HCWP18 Healthy Climate is not putting
My Lennox humidifier HCWP18 Healthy Climate is not putting moisture in the air. The pad has been changed and water is running through it, but it's not doing the job. Usually I can get the windows a li… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,142 satisfied customers
A quick question on a humidifier: The humidifier goes on at
A quick question on a humidifier: The humidifier goes on at 20 {manual on} but does not shut off when the flame goes off (cool). Where can I find manuals for these humidifiers and what is the problem?… read more
Appliance Guru
Appliance Guru
16,100 satisfied customers
I want to turn on the humidifier and I don't want to used
I want to turn on the humidifier and I don't want to used delay start and I don't want it to turn off with a timer....I just want it to run all of the tim … read more
Appliance Guru
Appliance Guru
16,100 satisfied customers
Over sizing a whole house humidifier on sq. ft. Will unit
Over sizing a whole house humidifier on sq. ft. Will unit not work … read more
Appliance Guru
Appliance Guru
16,100 satisfied customers
I am installing an Aprilaire 600 humidifier on a Trane XV90
I am installing an Aprilaire 600 humidifier on a Trane XV90 furnace. The wiring diagram calls for connecting the C terminal on the humidifier control to the C terminal on the furnace.I do not have a C… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have a Honeywell HE360 Whole House humidifier that I just
I have a Honeywell HE360 Whole House humidifier that I just installed. It will run for a few seconds and then clicks and shuts off then back on again. It does this continously. I have double checked t… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,805 satisfied customers
I have purchased 4 Honeywell humidifiers and 3 have stopped
I have purchased 4 Honeywell humidifiers and 3 have stopped working. … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,877 satisfied customers
I am having problems with my humidifier. An Aprilaire Model
I am having problems with my humidifier. An Aprilaire Model 700.Every time it starts, some water leaks out of the valve as shown in the picture. Not much, would say about an ounce or two. Then the lea… read more
Chad DeYoung
Chad DeYoung
11 satisfied customers
I need help to determine whether my Aprilaire humidifier is
I need help to determine whether my Aprilaire humidifier is working. … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,142 satisfied customers
I have a Bypass Humidifier, MODEL 445, and this season it is
I have a Bypass Humidifier, MODEL 445, and this season it is leaking water from the water tray. I went to remove the finger nut that secures the tray and it just split in half. could the finger nut be… read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
355 satisfied customers
How can I tell I my York furnace control board is the cause
How can I tell I my York furnace control board is the cause of the furnace not completing the heat cycle. It shuts down and give me the pressure sensor/switch code but two tech's have been out and ver… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,805 satisfied customers
I have a Honeywell Humidifier Model HE360A1075. I need to
Hi , I have a Honeywell Humidifier Model HE360A1075. I need to get an operation manual to install the humidifier in my home. … read more
hvacdave84
hvacdave84
88 satisfied customers
I have an HM512W1005 Direct Injection Humidifier. It
I have an HM512W1005 Direct Injection Humidifier. It currently connects wirelessly to a Honeywell thermostat. I'm trading that out for an Ecobee4 and need help knowing which wires to run from the humi… read more
Appliance Guru
Appliance Guru
16,100 satisfied customers
This is the same guy with the Goodman furnace control board
Hi, this is the same guy with the Goodman furnace control board / transformer. My plumber said what caused the board to fail was a short in the blower motor from water from AC unit backing up into blo… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,805 satisfied customers
I have a Goodman GMNTE120-5 It has a furnace/control board
I have a Goodman GMNTE120-5 It has a furnace/control board with this part number B1809925two of the wires have come off two connectors, and the wires are the same color - trying to determine if it mat… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,805 satisfied customers
I recently replaced my furnace control board. The furnace is
I recently replaced my furnace control board. The furnace is a Lennox G40-OUH and the control board was a White Rodgers 50-A65-121-07. The only replacement was a White Rodgers 50A65-843 Universal Boar… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,805 satisfied customers
Connected humidistat to Honeywell digital thermostat. I
Connected humidistat to Honeywell digital thermostat. I cannot bring the fan on when set on auto when the humidistat calls for cooling, air runs but fan does not. This is a mobile home in florida whic… read more
Ricky Main
Ricky Main
8 satisfied customers
Why is my furnace humidifier cycling on and off? -Rodgers
Why is my furnace humidifier cycling on and off?White-Rodgers HSP2000 Steam. When humidity reaches the control setting, it cycles on and off randomly.… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,877 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x