HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

Whirlpool Furnace, Model # NUGG075DF01 Just lit pilot light OK.

Whirlpool Furnace, Model # XXXXX...
Whirlpool Furnace, Model # XXXXX Just lit pilot light=OK. Furnace fires=OK. Turn fan on thermostat to 'ON' fan works=OK. With all covers on and secure, furnace fires, but fan does not come on automatically. Thermostat set to 'FAN-AUTO'. Is there a temp sensor or relay that needs replacement? Is there a schematic available?
Show More
Show Less
Ask Your Own HVAC Question
Answered in 2 minutes by:
10/17/2009
Kenton Guidry
Kenton Guidry, HVAC Technician
Category: HVAC
Satisfied Customers: 966
Experience: 12 years install/service experience.
Verified
Do you have a device that looks like the following picture? I do not have a diagram.
graphic
Ask Your Own HVAC Question
Customer reply replied 8 years ago

Yes, I have a device that looks like the picture.

 

Leon

That device acts as a hi limit, and fan delay.

Two wires are going to be the power to the fan.

The other two will be the control voltage to the switch.

Do you see that?
Ask Your Own HVAC Question
Customer reply replied 8 years ago

Yes, 2 yellow wires, 1 goes to FAN load, and 1 FAN line

and 2 orange wires, 1 goes to LIMIT load, and 1 LIMIT line.

 

OK

When in cooling your fan will run by getting power from another relay.

When in heating your fan will run by getting power from that limit switch.

So to check voltage you will measure from the neutral to the fan load.

This is a way to make the fan run at different speeds.

On a temperature rise the switch will close the fan line and load which will give the low or medium speed to the fan power.

Please respond with any further questions, or concerns.
Ask Your Own HVAC Question
Customer reply replied 8 years ago

Does this sound like a defective FAN/LIMIT switch? What is this switch called and how can I order a replacement?

 

I can see the dial rotate as temp rises, but I'm thinking it doesn't close the contacts to turn on the fan.

 

Just want to make sure I'm understanding what is occurring..

 

Thanks

 

 

You are correct Leon, this does sound like a defective switch.

However you can confirm this by measuring the resistance across the fan load and line, or you can measure voltage.

What is your zip code, I will see if I can find a location for you.
Ask Your Own HVAC Question
Customer reply replied 8 years ago
Zip code is: 30078
The following locations will be able to get you the part you need.

#J4 LAWRENCEVILLE, GA
2105 Newpoint Pl. Ste 300
Lawrenceville, GANNN-NN-NNNNbr />PHONE:(NNN) NNN-NNNNbr />FAX:(NNN) NNN-NNNNbr />Saturday Hours: CLOSED

#H3 CONYERS, GAXXXXXNW
Conyers, GANNN-NN-NNNNbr />PHONE:(NNN) NNN-NNNNbr />FAX:(NNN) NNN-NNNNbr />Saturday Hours: CLOSED
Kenton Guidry
Kenton Guidry, HVAC Technician
Category: HVAC
Satisfied Customers: 966
Experience: 12 years install/service experience.
Verified
Kenton Guidry and 87 other HVAC Specialists are ready to help you
Ask your own question now
Was this answer helpful?
Ask Kenton Guidry Your Own Question
Kenton Guidry
Kenton Guidry
Kenton Guidry, HVAC Technician
Category: HVAC
Satisfied Customers: 966
966 Satisfied Customers
Experience: 12 years install/service experience.

Kenton Guidry 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

6,938 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

966 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
I have just installed a new copeland compressor ( model
I have just installed a new copeland compressor ( model zr48k53-pfv-7me)and it won' start. Looks like it is wired right. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I just bought a house and I turned the air on and it is
I just bought a house and I turned the air on and it is coming out but doesn't seem to be circulating I went outside and the outside unit isn't even on or running … read more
David Bowden
David Bowden
Owner
843 satisfied customers
I have a rheem air exchanger RBHC It is suspend. Ed from
Ed from floor joists in step space with springs on one end. Just bought this house and my building inspector says I should put blocks under to keep from vibrating, but it seems to me it was suspended by springs for a reason … read more
Iohn Keffer
Iohn Keffer
HVAC Tech
Associate Degree
60 satisfied customers
Apt AC & Heat system controls are not working properly.
Apt AC & Heat system controls are not working properly. Seeking manual to explain how to reset controls for IF90-371 programable thermostat … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
I just tried to switch out pump on taco 00 circulating pump
I just tried to switch out pump on taco 00 circulating pump and had New seal in place and bolted down tight. When I turned it on it had a couple drips after opening valves. When I turned hot water on … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Vegetables freezing in crisper and cold water is not working
Vegetables freezing in crisper and cold water is not working but ice maker is … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a Rite Temp 8022 Thermo stat. Thermostat. Takes 20-50
Takes 20-50 pushes on Temp decrease to get temp to drop… read more
David Bowden
David Bowden
Owner
843 satisfied customers
Just switched out my IFC and went to start the heater but
Just switched out my IFC and went to start the heater but i'm getting a 6 flash error code for a "115 volt AC power reversed/improper ground". I have a trane 80xe furnace with a 50A55_843 a new univer… read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
452 satisfied customers
How do I replace the battery's. How do I get cover
How do I replace the battery's . How do I get cover off.Thermostat is 10 years old. Similar to th2210DV1006 PR … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
I have a goodman unit. Last night during use the outdoor
I have a goodman unit. Last night during use the outdoor compressor and fan quit working, but at the same time the indoor blower will not turn off unless I remove power to the blower. … read more
David Bowden
David Bowden
Owner
843 satisfied customers
We check the unit and it does not have a Freon leak. We also
We check the unit and it does not have a Freon leak. We also cleaned the exterior unit and looking to trouble shoot what could be driving the frost build up.… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,796 satisfied customers
The fan switch chain came out so I cannot change the fan
The fan switch chain came out so I cannot change the fan speed. I fan has 3 speeds. I can't find the model name or number on the fixture. I think I need to replace the switch because there is no place… read more
David Bowden
David Bowden
Owner
843 satisfied customers
Repair instructions for lakes heat pump with code E1. It was
repair instructions for lakes heat pump with code E1 … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,796 satisfied customers
Honeywell thermostat th6220u222000, i had to pull it out to
honeywell thermostat th6220u222000, i had to pull it out to get the model number. do i need to reprogram it? … read more
David Bowden
David Bowden
Owner
843 satisfied customers
I just replaced my capacitor and contactor and got my ac
I just replaced my capacitor and contactor and got my ac running again. It was nice and cool last night. This morning, however, the unit quit working again. I am trying to identify what my cause this … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
Can you tell me how old this portable air conditioning unit
Can you tell me how old this portable air conditioning unit is and about how much it could be sold for, it's in great condition… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
Is the amount of air exiting the air handler equal to all
is the amount of air exiting the air handler equal to all ports? … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
The thermostat is blank we installed a new one it blank
The thermostat is blank we installed a new one it blank also, we cleared all drains and unit has power to it...any suggestions … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 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