HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

Trying to trouble shoot my furnace its a lennox SP745 act

Customer Question
like its wants to start...
trying to trouble shoot my furnace its a lennox SP745 act like its wants to start but doesnt
JA: Did you check the furnace's filters?
Customer: dont know where they are
JA: Do you plan on doing the work yourself?
Customer: depends on what i find out
JA: Anything else we should know to help you best?
Customer: not that i can think of
Submitted: 1 year ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 1 hour by:
10/8/2016
HVAC Technician: HvacmanSean, HVAC Technician replied 1 year ago
HvacmanSean
HvacmanSean, HVAC Technician
Category: HVAC
Satisfied Customers: 222
Experience: Owner HVAC company
Verified

good evenin, Are you on currently?

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,022
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, that model number SP745 you gave is from one of the parts inside the furnace (the ignition controller)... it is not the furnace model number that is on a sticker or metal plate mounted in the same large compartment as the gas valve as a rule.

Tell me a lot about you your technical skills background and so that I can coach you most effectively.... if you need in depth coaching and have the needed skills use the 'attach files' link to the left of your send button to attach a well lit, exceedingly well focused photo of the furnace wiring diagram that is glued to the inside of the blower service door.

We can go from there.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Nothing comes on I hear a humm like furnace wants to start but can't also the damper door opens but blower motor does not come on
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago

This will be a complex diagnosis and repair, and since it is a gas fired furnace with multiple built in hazards I will look in your local area for a well rated furnace repair outfit or two.. For that I need to know which direction you are from the center of the nearest town or city.

Ask Your Own HVAC Question
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago

Without some furnace related skills this is nothing you should be trying to fix yourself (the college course on this range of technologies is 2 years full time).

Ask Your Own HVAC Question
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,022
6,022 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

6,022 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
Can,t turn on furnace ...this is our first rv. 2007 coachman
Yes, Trying to. So far I have checked the limit switch, wire connections and voltages. Furnace is aAtwood7920_ll. Fault light says it's either limit switch fault or air flow problem. Does not come on at all. … read more
Randall
Randall
Owner of RV shop and mobile service
Vocational, Technical or Trade Scho
12,157 satisfied customers
I am trying to install a Honeywell focus pro 6000. Y
I am trying to install a Honeywell focus pro 6000. Y existiu … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
My Honeywell RTH9580 will not auto switch between warm and
my Honeywell RTH9580 will not auto switch between warm and cold. The manual says it the furnace wiring. how can I change the wiring to achieve this. My other furnace with an older Honeywell thermostat… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Installing a new gas valve and just want to make sure I
Installing a new gas valve and just want to make sure I understand the electrical connection component … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have a old 7 wire thermostat. replacing with a new
I have a old 7 wire thermostat. replacing with a new honeywell thermostat. one lead has a red and white. the other lead has a red, white, yellow, blue and green. this a furnace and air conditioner sys… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Wiring an Evcon 7670-368 to a Venstar T7900... Where does
Wiring an Evcon 7670-368 to a Venstar T7900... Where does the B terminal on the Evcon wire to on the Venstar? … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a heater that will turn on for 5 minutes then shut
I have a bryant heater that will turn on for 5 minutes then shut down with a 31 code … read more
Phil
Phil
Mechanical Engineer
6,022 satisfied customers
Question furnace house. Heat cool switch on furnace and put
Question Coleman furnace house. Heat cool switch on furnace and put a thermostat on and has heat cool and the AC runs whether there's a thermostat on the wall up the ball and someone got two wires fro… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have a furnace wiring problem, I am 99.99% sure the
I have a furnace wiring problem, I am 99.99% sure the thermostat wires are shorted but I can not find the breaks. I used a multimeter and have questions … read more
Ricky Main
Ricky Main
8 satisfied customers
I have 4 wires, black,, and red. Since yesterday. I want to
I have 4 wires, black,green, white and red JA: I'll do all I can to help. How long have you been dealing with this? Customer: Since yesterday JA: Do you plan on doing the work yourself? Customer: Yes,… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a furnace and I have a Honeywell wired to it.
I have a Bryant furnace and I have a Honeywell wired to it. Attempted to turn on ac today and the unit outside will not turn on. I think it is wired wrong … read more
Phil
Phil
Mechanical Engineer
6,022 satisfied customers
Sx ultra 80 high efficiency furnace. installed new
sx ultra 80 high efficiency furnace . installed new thermostat and outside ac unit wont come on, only inside blower. i read some on this forum and twisted the red blue and green together with no therm… read more
Phil
Phil
Mechanical Engineer
6,022 satisfied customers
I have a Carrier 585TA070-13112 that won't turn on. Changed
Hello. I have a Carrier 585TA070-13112 that won't turn on. Changed batteries in thermostat; turned off and on power. Blinking red light is 2 and 4. A furnace repair company said there's a reset switch… read more
Phil
Phil
Mechanical Engineer
6,022 satisfied customers
My Rudd furnace has stopped working. checked the circuit
my Rudd furnace has stopped working. checked the circuit breaker no problem there the flame/ok/power lights will not come on. any suggestions..… read more
Phil
Phil
Mechanical Engineer
6,022 satisfied customers
I have a problem with an Amana gas furnace 13 years old. The
I have a problem with an Amana gas furnace 13 years old. The *rotor " in the blower motor seems to have tilted and causes the blower wheel to hit surroundings. What would be the best approach to fix t… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Phil I have a nordyne furnace model number kg7sc072d-24b. We
Hi Phil I have a nordyne furnace model number kg7sc072d-24b. We have had trouble getting the furnace to operate this season. we have changed the filter and the system is trying to fire up. The ignitor… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Connecting a Honeywell thermostat to a ruud furnace...HVAC
connecting a Honeywell thermostat to a ruud furnace...HVAC question what color wires from thermostat are compatible with ruud furnace wires… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I am back. Apparently, flipping the switch does not solve
Hi I am back. Apparently, flipping the switch does not solve the problem with this error code. Do you have a better answer than the one my HC guy can't come up with without the Lennox support people? … read more
Phil
Phil
Mechanical Engineer
6,022 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