HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

I just changed batteries in 7 day Honeywell thermostat and…

Customer Question
I just changed batteries...

I just changed batteries in 7 day Honeywell thermostat and can not get the heater to turn on.

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

Thermostat worked fine until batteries died.

Contractor's Assistant: Do you plan on doing the work yourself?

If possible.

Contractor's Assistant: Anything else we should know to help you best?

I only have three buttons besides the heat or air buttons that say set, run and hold. what do I do to get this ting to work.

Submitted: 3 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 2 minutes by:
12/29/2017
HVAC Technician: airheatman, HVAC Technician replied 3 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,977
Experience: Furnace, A/C and heat pump specialist.
Verified

Try setting to Heat then hold and then set temp above room temp.If heat does not come on issue may be with furnace rather than thermostat

Ask Your Own HVAC Question
Customer reply replied 3 months ago
I just changed batteries in thermostat and had to reprogram daily settings. do I need to have thermostat on todays setting?
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

If you select heat Hold and set temp above room temp day should not matter

Ask Your Own HVAC Question
Customer reply replied 3 months ago
ok setting room temp higher and hold did nothing.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

Issue is probably with furnace.Remove R and W wires on thermostat and touch the wires together and see if furnace comes on

Ask Your Own HVAC Question
Customer reply replied 3 months ago
Forget the phone call and give me some answer other than something may be wrong with heater. It worked just fine until I changed the batteries in thermostat.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

If you want help please follow my instructions.

Ask Your Own HVAC Question
Customer reply replied 3 months ago
I touched the R and W wires together with no response.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

OK that proves as I was saying that thermostat is NOT the issue. You just bypassed the thermostat.Can you look inside the burner compartment on label on side panel and get me the model on your furnace? Then look in blower compartment and see if there is an error light blinking that will guide us in determining what is failing with the furnace.)Not if no peep hole and you have to remove blower panel to see control board, it will be necessary to hold door switch in to have power to board)

Ask Your Own HVAC Question
Customer reply replied 3 months ago
it's a Rheem Heater. I couldn't find a model #. The pilot light is lit if that's any help.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

Model will be on a label in burner compartment on side panel

Ask Your Own HVAC Question
HVAC Technician: airheatman, HVAC Technician replied 3 months ago
Ask Your Own HVAC Question
Customer reply replied 3 months ago
model # is hard to see. I think it's 3204-80JD
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

Should begin with letter R

Ask Your Own HVAC Question
Customer reply replied 3 months ago
No letter R. It is as I described.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

OK if nothing with letter R this thing has to be at least 40 to 45 years old. Does that seem correct?

Ask Your Own HVAC Question
Customer reply replied 3 months ago
house was built in 74. It's possible.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

Wow that is an oldie.I will not be able to find a manual on that one.

Let me ask you this.Do you have a volt meter to do some troubleshooting?

Ask Your Own HVAC Question
Customer reply replied 3 months ago
I'm not that technically friendly.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

What we need to do is see if we have voltage between the R and C terminals on the transformer on the inside left of the furnace.

That R at thermostat is 24v hot. Connecting it to W should send the 24v hot back to the gas valve if we have power from transformer.

Ask Your Own HVAC Question
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

I understand that it doesn't make sense all you did was change batteries if furnace was working before, but if you connected R and W wires and furnace does not come on we have a problem in furnace.You may want to just call in a service company if you are not able to troubleshoot and don't have meters.

Ask Your Own HVAC Question
Customer reply replied 3 months ago
I shorted the connection between R and C and produced a electrical spark.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

Yes R and C will create a dead short that is 24v hot and 24v common

Ask Your Own HVAC Question
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

You cant short those two.That is where we wanted to put our meter leads,

Ask Your Own HVAC Question
Customer reply replied 3 months ago
ok How do I connect R to W
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

At thermostat you already did right?

Ask Your Own HVAC Question
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

OK do you see an R and a W on that transformer in furnace? If so use a pair of needle nose pliers and touch the tips to R and W. Hopefully you did not fry thermostat earlier when you shorted R and C

Ask Your Own HVAC Question
Customer reply replied 3 months ago
R and W connected with no result. Transformer still makes sparks.
HVAC Technician: airheatman, HVAC Technician replied 3 months ago

OK we have to have a limit or something in the furnace open.Coincidental that you were just changing thermostat batteries but touching R and W should bring on gas valve. Thermostat and external wiring are totally out of the picture.

Ask Your Own HVAC Question
Was this answer helpful?
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,938
6,938 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil 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
We have model AH16X20BA air handler. We know the heat pump
We have coleman model AH16X20BA air handler. We know the heat pump is bad and just want EM heat to come on. Thermostat batteries are good . Power to the heat strips but no fan operation or heat.HELP? … read more
Bill
Bill
Service Mgr
80 satisfied customers
The thermostd says low battery. I changed the batteries and
the thermostd says low battery. I changed the batteries and no change … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,684 satisfied customers
My thermostat batteries were dead when i came home from work
Hi pearl - my thermostat batteries were dead when i came home from work - now my heater wont turn on - i did change thebatteries … read more
airheatman
airheatman
HVAC Technician
8,977 satisfied customers
We have a Biasi B10 series boiler furnace. The 2nd floor
Hi! We have a Biasi B10 series boiler furnace. The 2nd floor heat is coming in great. The downstairs heat is not coming in the baseboards are all cold! Trying to figure out how to fix this. … read more
Plumbers_Mate
Plumbers_Mate
General Manager
Vocational, Technical or Trade Scho
2 satisfied customers
Xrv95 trane furnace. Power to unit, fuse ok, transformer ok,
xrv95 trane furnace. Power to unit, fuse ok, transformer ok, Circuit breaker ok. Power to furnace. Changed thermostat batteries. Problem is fan will not run even in on position. No heat. No codes, no … read more
Certified HVAC Service Technician
Certified HVAC Service Technician
Welder
Vocational, Technical or Trade School
3 satisfied customers
Xrv95 trane furnace. Power to unit, fuse ok, transformer ok,
xrv95 trane furnace. Power to unit, fuse ok, transformer ok, Circuit breaker ok. Power to furnace. Changed thermostat batteries. Problem is fan will not run even in on position. No heat. No codes, no … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Can't get my heat to stay on. Checking filter. It comes on
It comes on than goes off it got a programmable mode… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a rheem classic 90 plus that has no heat, no fan
I have a rheem classic 90 plus that has no heat, no fan blowing for heat or air. The diagnostic leds are as follows flame=not lit, the next one=constant green, the next one=constant green. I have chan… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I the book have RTH7600 ther' I have wires G Y W R O for
I the book have RTH7600 ther' I have wires G Y W R B O for heatpump with heat The book has no diagram for hook-up Please help … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
My batteries only last 2 days. 8 days. Just started this
my batteries only last 2 days JA: I'll do all I can to help. How long have you been dealing with this? Customer: 8 days JA: Do you plan on doing the work yourself? Customer: yes JA: Anything else we s… read more
Kcrand36
Kcrand36
Technician/Owner
Vocational, Technical or Trade School
72 satisfied customers
My furnace is not blowing out hot air, I'm trying to trouble
Hi, my furnace is not blowing out hot air, I'm trying to trouble shoot the cause … read more
airheatman
airheatman
HVAC Technician
8,977 satisfied customers
Just changed thermostat batteries and ac will not come on.
just changed thermostat batteries and ac will not come on … read more
airheatman
airheatman
HVAC Technician
8,977 satisfied customers
We have a Honeywell Chronotherm III that we have to replace
we have a Honeywell Chronotherm III that we have to replace the batteries in every 4-5 days. Any suggestions? … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Thermostat says no power red line is not conted. Specific to
thermostat says no power red line is not conted JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? Customer: specific to thermostat JA: Do you pl… read more
Michael Ferryman
Michael Ferryman
97 satisfied customers
My honeywell jyric thermostat battery does not charge.
my honeywell jyric thermostat battery does not charge … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
I have a RTH2310B thermostat. Battery went out. Replaced.
I have a RTH2310B thermostat. Battery went out. Replaced. Trying to just get it bact to the "Hold position … read more
Phil
Phil
Mechanical Engineer
6,938 satisfied customers
Need battery for - Rodgers 1970s furnace thermostat. Battery
Need battery for White - Rodgers 1970s furnace thermostat. Battery Replacement W.R Part no.(###) ###-#### 44-4868. Have tried Specialty Battery stores to no avail.… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
How replace thermostat battery? Thermostat screen is
Thermostat screen is flashing message to replace battery. … read more
Rick the plumber
Rick the plumber
Owner
9,857 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