HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Goodman 80% up flow furnace: intermittent operation

Customer Question
Goodman 80% up flow...

Goodman 80% up flow furnace: intermittent operation including shut-off before desired temp is reached. New thermostat and gas valve. Usually goes to lockout (steady slow flashing). Thermostat and control board connections tight. Sequence of operation goes through ignitor glow but no gas to burners. Cycles three times to lockout.

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

How can it be thermostat if sequence goes to ignitor ?

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

Absolutely. Electronics tech in Air Force (years ago), accomplished mechanic. Need specific instructions for isolating problem. Transformer good. Sequence of operation leads me to believe pressure switch is good.

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

Go.

Submitted: 7 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 4 minutes by:
1/2/2018
HVAC Technician: airheatman, HVAC Technician replied 7 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,367
Experience: Furnace, A/C and heat pump specialist.
Verified

If ignite glows but no ignition next step is to check for 24 volts to the gas valve as soon as igniter heats up

Ask Your Own HVAC Question
Customer reply replied 7 months ago
have done that. no voltage. have not been able to catch a voltage reading when or just before ignition.
HVAC Technician: airheatman, HVAC Technician replied 7 months ago

If igniter lights but we do not get voltage to valve, the board is bad and will have to be replaced. Intermittent issues are also characteristic of a failing board. There are no limits or anything else in the circuit between time if igniter glowing and gas valve opening .

Look at igniter and make 100 per cent sure the entire igniter is glowing and there is no break.

Ask Your Own HVAC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a hvac technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7,426
7,426 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

7,426 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

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

1,024 satisfied customers

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

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

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
Hello, I have a York Diamond 80 upflow furnance and it stopped
Hello, I have a York Diamond 80 upflow furnance and it stopped working today. Just 1 flash on the control board (system lockout). Few days ago it had 7 flashes (low flame sense signal). I tried to pow… read more
theplumber717
theplumber717
Plumber
Vocational, Technical or Trade Scho
791 satisfied customers
Lennox G40UH-36A-070-07 heater quit last night. Seems the igniter
Lennox G40UH-36A-070-07 heater quit last night. Seems the igniter isn't reacting. Both green lights flashing fast together indicating no problem.… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Natural Gas Furnace takes a long time to kick on when thermostat
Natural Gas Furnace takes a long time to kick on when thermostat is 10 degrees higher then temp on display! takes nearly 10 to 20 min to kick on! when light operates normally, then after a while flame… read more
D.E. Anderson
D.E. Anderson
Industrial Refrigeration Service Manager
200 satisfied customers
Luxaire furnace blowing cold air. Model number is XXXXX
Luxaire furnace blowing cold air. Model number is XXXXX I have reset power. Pull flame sensor and cleaned. No flame. Code flash is 7. I'm guessing igniter bad. Any ideas????… read more
warmneighbor
warmneighbor
owner
Vocational, Technical or Trade Scho
9 satisfied customers
I HAVE A BARD DCH FURNACE WHICH WILL RUN FINE FOR A TIME (DAYS)
I HAVE A BARD DCH FURNACE WHICH WILL RUN FINE FOR A TIME (DAYS) THEN WILL GO INTO A HARD LOCKOUT. THE IGNIGHTER IS GOOD AND WORKS ALL THE TIME. AFTER CYCLING NORMALLY, FOR DAYS, IT THEN GOES INTO A TR… read more
Wvfan79
Wvfan79
Mecanical Designer & Estimator
High School or GED
775 satisfied customers
I HAve an amana gas furnace model # XXXXX It shows on
I HAve an amana gas furnace model # XXXXX It shows on the trouble shooting panel that the light is flashing red. which in turn says lockout.. it done this a few years ago and i believve they changed c… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
goodman 70K 95% 2 stage furnace i installed was running perfect
goodman 70K 95% 2 stage furnace i installed was running perfect now will not fire... flashing no codes… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have an amana 80 sse furnace with a white rogers 50a50-298
I have an amana 80 sse furnace with a white rogers 50a50-298 control unit. On initial start up the unit works fine. vaccum fan then ignitor then flame and blower for about 5 minutes. After the initial… read more
Bart Jay
Bart Jay
Vocational, Technical or Trade Scho
596 satisfied customers
Goodman GMT 070-3 1999 Intermittent Issue Turns On Ignitor
Goodman GMT 070-3 1999 Intermittent Issue: Turns On > Ignitor Glows > Gas Lights [pretty blue] > Runs 2 or more minutes [red troubleshooting light steady glow] > Gas turns off [red light b… read more
Richard
Richard
District Technical Manager
Vocational, Technical or Trade Scho
1,416 satisfied customers
My 1996 Lennox Conservator III G16 gas furnace will not start
My 1996 Lennox Conservator III G16, ELECTRIC START, gas furnace will not start and stay running. I have an old mercury round thermostat. How should I trouble shoot this to DIY fix? I spent 2 hours str… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Im trying to figure out why the burners wont ignite on my
I'm trying to figure out why the burners won't ignite on my Goodman furnace (GMS8, GDS8, GHS8). I've tried the furnace start up, shut down, and lockout reset instructions. Any suggestions?… read more
Tom
Tom
HVAC Technician
Vocational, Technical or Trade Scho
770 satisfied customers
i have a reznor vr nateral gas. i an in iowa and it was cold
i have a reznor vr nateral gas. i an in iowa and it was cold this winter and it work fine. for about a week it wont run for about 5 min. and stops. i can flip the braker and it will run for 5 min. the… read more
Tom
Tom
HVAC Technician
Vocational, Technical or Trade Scho
770 satisfied customers
I HAVE A GOODMAN 70,000 BTU 80% FURNACE, ABOUT 4 YEARS OLD.
I HAVE A GOODMAN 70,000 BTU 80% FURNACE, ABOUT 4 YEARS OLD. INTERMITTANT PROBLEM HAS NOW BECOME CONSTANT. FURNACE GOES INTO LOCK OUT AFTER TRYING TO FIRE 3X. WHEN CALLS FOR HEAT, INDUCER FAN STARTS, I… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a lennox 80MGF with a upgraded ECG-1 board that was
I have a lennox 80MGF with a upgraded ECG-1 board that was replaced 9 years ago. Never had any problems with unit. Ok now the sequence. Blower works fine, house had gas and gas line is ok as hot water… read more
DanielC
DanielC
Service manager
High School or GED
95 satisfied customers
My furnace controller LED is flashing twice and pausing. The
My furnace controller LED is flashing twice and pausing. The legand sticker on the inside panel shows "external lockout, retries or recycles exceeded". What does this code mean and what can I do about… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Having difficulty with furnace not kicking in. The ignition
Having difficulty with furnace not kicking in. The ignition light goes on, and about 20 seconds later the fan kicks in, but blows cool air. Then after about thee to five minutes, it goes back off. We … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a gas furnace model XL 80. when turn on the burners
I have a gas furnace model XL 80. when turn on the burners don't go on. so no heat is coming out, the pump works and the lighter turn on but the burners no. can you help me this problem please.… read more
Josh
Josh
Service Technician
High School or GED
30 satisfied customers
I have a goodman heater, that sometimes works properly for
I have a goodman heater, that sometimes works properly for a heating cycle, then the main burner will not come on. I have replaced the board, gas valve, ignitor, and have tested unit with roll outs by… read more
HVACguy
HVACguy
Vocational, Technical or Trade Scho
18 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