HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

Lennox digital theromstat is blank and the air is not on :

Customer Question
Lennox digital theromstat is blank...
Lennox digital theromstat is blank and the air is not on
JA: Sometimes HVAC issues that that you think will be really complicated end up being easy to fix. The HVAC Technician I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so we can help you best.
Customer: Lennox digital thermostat is black and the ac is off.
JA: Is there anything else important you think the HVAC Technician should know?
Customer: The other unit upstairs is on and working fine.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 1 year ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 2 minutes by:
5/28/2016
HVAC Technician: Gaztech, HVAC Technician replied 1 year ago
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 640
Experience: Owner at Gaztech
Verified

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue.

If my initial response doesn’t answer your question then let me know and we can continue our conversation.

NOTE: I can only get paid for assisting you if you click FINISHED and RATE ANSWER after you are satisfied with answer.

Are you ready?

Ask Your Own HVAC Question
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 17,633
Experience: 20yrs in the HVAC industry with certificates and degrees.
Verified

Hello and thanks for using this service, if you have been waiting do not worry or get upset. I am HVAC Guru an extremely experienced tech on the site and I try to get to as many customers as I can. I just picked up your question now. NOTE it takes time for me to type research and add links so please wait for me to respond back I can only do this so fast. Secondly I am not paid anything until you rate my service good using the STAR RATING LINK at the top of your page, the money is paid to the site not me directly.

Answer:

The most common cause is a blow low voltage fuse on the control board in the furnace or airhandler, that supplies power to the thermostat. There should be a slot style fuse or inline fuse on the board in the unit, check for that and see.

All I ask is please use the Star Rating Link at the top of your page before leaving, that is the only way I am paid anything through the site.....tips are greatly appreciated so thank you very much for using this service. If you have any other questions just post back to me here anytime!

Ask Your Own HVAC Question
HVAC Technician: Gaztech, HVAC Technician replied 1 year ago

The most common cause is a blow low voltage fuse on the control board in the furnace or airhandler, that supplies power to the thermostat. There should be a slot style fuse or inline fuse on the board in the unit, check for that and see.

All I ask is please use the Star Rating Link at the top of your page before leaving, that is the only way I am paid anything through the site.....tips are greatly appreciated so thank you very much for using this service. If you have any other questions just post back to me here anytime!

Ask Your Own HVAC Question
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Sir I am sorry Gaztech has just copied my answer and posted it, if you need anything let me know

HVAC GURU

Ask Your Own HVAC Question
Customer reply replied 1 year ago
I am in the box but do not see a fuse
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Ok do you see the control board? You should be looking for this...

CLICKHERE

HVAC GURU

Ask Your Own HVAC Question
Customer reply replied 1 year ago
I see the control board
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

OK do you see a slot fuse on it?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
No
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

OK do you see any inline bus fuse going to the board at all or on the board? Like a cylinder style fuse

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Found the box fuse. It is purple and has an E on it. It does not appear to be broken.
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Yes that is the fuse double check it with a meter and see

Ask Your Own HVAC Question
Customer reply replied 1 year ago
I see power on the board
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Are the lights flashing an error?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
The go E. 5. 4. 2. 1
Customer reply replied 1 year ago
Ready
the lights are flashing E 5 4 3 2 1
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Do you see the error code list on the panel that you took off it should be listed there what is the error?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
E. 5. 4. 3. 2. 1
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Is there an error list taped to the panel or what exact mode is it?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Don't see one
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

What is the complete model of the unit, it is getting late we may have to pick this up tomorrow.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Lennox m/n cbx32mv-036Sn5811j07737
Customer reply replied 1 year ago
E105
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

That is a communication failure between the unit and the thermostat, you may have a bad control board. Try to power everything down for a minute and power it all back on. See if it will work then if not you likely have a failed control board.

All I ask is please use the star rating link before leaving tonight thanks

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Power down outside?
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Yes power the entire system down at the breaker panel

Ask Your Own HVAC Question
Ask HVAC Guru Your Own Question
HVAC Guru
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 17,633
17,633 Satisfied Customers
Experience: 20yrs in the HVAC industry with certificates and degrees.

HVAC Guru 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

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
I am trying to hookup a digital thermostat but cannot figure
I am trying to hookup a digital thermostat but cannot figure out the c wire on the furnace … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My Honeywell digital thermostat, i've Changed the batteries
My Honeywell digital thermostat, i've Changed the batteries but I cannot adjust the temperature to go up. It will go down. All other functions seemed to be working … read more
HVAC Guru
HVAC Guru
HVAC TECH
17,633 satisfied customers
Some "friend" reset my Honeywell digital thermostat and now
Some "friend" reset my Honeywell digital thermostat and now it seems to be … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My digital thermostat went out, cannot set or see what temp
my bryant digital thermostat went out, cannot set or see what temp it is … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
I have a replaced older standard digital thermostats with
I have a replaced older standard digital thermostats with Honeywell Lyric T5. I have electric unit with single stage cool and two stage heat I think (heat and emergency heat on old thermostats). When … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Our digital thermostat went blank. We have a model
Hi! Our digital thermostat went blank. We have a model CU5830-C175 Payne furnace. Code 33. I replaced a very dirty filter, manually hit the reset and the furnace worked, fan and flame. Goes through a … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
We have a 7-day programmable digital thermostat and lost the
We have a 7-day programmable digital thermostat and lost the instructions. I messed up trying to program it, and now it won't come on at all. It is getting very cold and we need the heat. How can I ge… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a carrier unit in attic/digital thermostat/nothing is
i have a carrier unit in attic/digital thermostat/nothing is turning on-even in fan mode,all breakers are goood … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Need assistance in programing honeywell digital thermostat.
need assistance in programing honeywell digital thermostat … read more
HVAC Guru
HVAC Guru
HVAC TECH
17,633 satisfied customers
I have a Honeywell digital thermostat. the back light was
I have a Honeywell digital thermostat. the back light was out. it said the battery needed replacing. forgetting you can tip out the battery pack to do the replacement, I just pulled the unit off the m… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Batteries died in heat pump digital thermostat. Change
Batteries died in heat pump digital thermostat. Change batteries (3 AAA) replaced unit now no AC or fan?… read more
Michael Ferryman
Michael Ferryman
87 satisfied customers
Trying to install a new digital thermostat. The AC red and
Trying to install a new digital thermostat. The AC red and white wires were spliced into the wires going from the furnace to the old thermostat. So I thought, "These should just be installed directly … read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
386 satisfied customers
I have an Emerson digital thermostat. The display is not
I have an Emerson digital thermostat. The display is not showing "system on" even though it should be calling for AC. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a 1F80-361 programmable digital thermostat which,
I have a 1F80-361 programmable digital thermostat which, after 10 years, is giving me problems. Upon returning from an extended vacation, the thermostat is reading 79 degrees (HOLD mode) and the outdo… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I installed a Honeywell Rth 6340/50 digital thermostat a
I installed a Honeywell Rth 6340/50 digital thermostat a couple of weeks ago and I have had nothing but problems ever since. When I called Honeywell they helped me set up the programming but I'm still… read more
Charles
Charles
HVAC Technician
Associate Degree
91 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
Will a honeywell round nonpowered digital thermostat work
Will a honeywell round nonpowered digital thermostat work with my taco 4 zone circulator control … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Lost the manual for a digital thermostat, cooling worked
lost the manual for a digital thermostat, cooling worked fine, heat is not working although the fan on auto comes on … read more
D.E. Anderson
D.E. Anderson
Industrial Refrigeration Service Manager
200 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