HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

I have a Ducane 80G1UH that barely ignites before turning…

Customer Question
I have a Ducane...

I have a Ducane 80G1UH that barely ignites before turning off and then giving me a diagnostic #3 which says that "pressure switch is open with inducer on". I've tried cleaning the flame sensor but no help

Contractor's Assistant: I'll do all I can to help. How long have you been dealing with this?

A few weeks

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

Yes

Submitted: 6 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 9 minutes by:
12/29/2017
HVAC Technician: Phil, Mechanical Engineer replied 6 months ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,722
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, tell me please if you see the igniter glowing at any time or any flame at all for even a few seconds.... if not, then the pressure switch will need our attention.

If you do see any glow from the igniter or any flame at all for even a second, then the pressure switch is not the problem, we can go from there without any time limits.

.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

.

Ask Your Own HVAC Question
Customer reply replied 6 months ago
the igniter does turn on for usually a second or two, then quickly turns back off.
HVAC Technician: Phil, Mechanical Engineer replied 6 months ago

Thanks, ***** ***** is actually just one or two seconds, then the problem is with the printed circuit board, it is not keeping the igniter on long enough to fire and the gas valve is not opening to provide fuel to enable firing.

click here to buy a new board,

.

My rationale, if the pressure switch was staying open and not closing or any incorrect behavior from the pressure switch, the igniter would never have gotten any power for those 1 or 2 seconds....

.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

.

Ask Your Own HVAC Question
Customer reply replied 6 months ago
Sorry maybe I didn't understand, the igniter glows hot for about 5 seconds and the gas does ignite, however it only burns for a couple seconds.
HVAC Technician: Phil, Mechanical Engineer replied 6 months ago

Thanks, ***** ***** igniter glows and the gas valve opens allowing ignition for a couple of seconds, the pressure switch is fine, and it is a dirty flame sensor rod that becomes the primary suspect, clean that with steel wool to bare shinny metal, if you need **plumbers emery cloth to get to bare metal, use it.

.

If cleaning the flame sensor fails, the printed circuit board is next primary suspect, first replug all the connections to the board, that burnishes the oxide from the connectors, if that fails do a heat stress test on the board.

Use a hair drier to warm the board to 130F or so, if anything then changes for the better or worse, you have proven that there are microscopic cracks in the board and that the board needs to be replaced.

We can go from there without a time limit

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: 9,722
9,722 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

9,722 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

1,019 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
I have replace the board and the the limit switch and the
i have replace the board and the the limit switch and the flame sensor. now and before the exact thing happens.... exhaust would come on and the igniter would glow orange flame would kick on and then … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Have a heil dc90 furnace inducer runs but no ignition or
have a heil dc90 furnace inducer runs but no ignition or blower. only does this once in awhile. … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
9,722 satisfied customers
My Ducane HE condensing furnace (14 yrs old, model #CMPA100U4,
My Ducane HE condensing furnace (14 yrs old, model #CMPA100U4, serial #2250709912) is not heating. I think the problem is the draft inducer blower. When it trys to kick on it will hum for a minute or … read more
Heath.M
Heath.M
Refrigeration Mechanic
Vocational, Technical or Trade School
223 satisfied customers
We have a Ruud Achiever Super Quite 80 Series furnace. My husband
We have a Ruud Achiever Super Quite 80 Series furnace. My husband has cleaned the flamed sensor, check the flu for restrictions, changed the filter (which wasn't bad, we are pretty good about changing… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Hello. I have a Ruud High Acheiver Super Quiet 80. It has been
Hello. I have a Ruud High Acheiver Super Quiet 80. It has been shutting itself off recently. In the past, we've just been following the instructions for the restart and that has been working, but it's… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have a Lennox 80MGF3-75A-1 furnace that is malfunctioning.
I have a Lennox 80MGF3-75A-1 furnace that is malfunctioning. Here is my description of what was originally happening, my fix, and what is happening now. Originally happening: Step 1) The combustion bl… read more
warmneighbor
warmneighbor
owner
Vocational, Technical or Trade Scho
9 satisfied customers
Hi, I have a weathermaker 9200 which isnt working and has
Hi, I have a weathermaker 9200 which isn't working and has a red light blinking. I can get the AC and fan on from the thermostat. I took off the thermostat and tried connecting the R and W wires to ge… read more
Heath
Heath
Vocational, Technical or Trade Scho
1,027 satisfied customers
When I turn my furnace on, I can hear the fan turn on and then
When I turn my furnace on, I can hear the fan turn on and then I can see the flame turn on and then it turns off again. It continues cycle turning on and off. If I unplug the furnace, the furnace will… read more
Heath
Heath
Vocational, Technical or Trade Scho
1,027 satisfied customers
Experiencing ignition problems on Armstrong gas furnace.
Experiencing ignition problems on an Armstrong SX90 gas furnace. I have replaced the smart value and the ignition assembly. Worked for a few weeks and now it only occasionally ignites. I opened the th… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
5,349 satisfied customers
My Bryant furnace is not putting out warm air. I just went
My Bryant furnace is not putting out warm air. I just went and looked at the RED LED status light and it was blinking. After removing both panels and then replacing the top panel, the light remained o… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a brand new Ducane CG80 gas furnace, the burners ignite
I have a brand new Ducane CG80 gas furnace, the burners ignite for a few seconds & shut off. After it does this a few times the furnes locks out. Code reads failed to ignite burners. Any ideas?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
hello, im looking for this part , looks like a limit switch
hello, i'm looking for this part , looks like a limit switch for coleman echelon 9v....i'm getting a 3 red light flash code....the part i'm looking for is .....would you be able to help? the furnace w… read more
Heath
Heath
Vocational, Technical or Trade Scho
1,027 satisfied customers
I am getting a reading of three flashes on my diagnostic light
I am getting a reading of three flashes on my diagnostic light , we tested the air switch from normally open and blew into it and the contacts sounded like they closed so we verified that it closed wi… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
5,349 satisfied customers
Diagnostic flash code for Coleman Evcon Furnace model #BGM12520B
I need the Diagnostic flash code for Coleman Evcon Furnace model #BGM12520B Optional Information: Make : Coleman Evcon Model : BGM12520B Already Tried: Need diagnostic Flash Code… read more
Bill
Bill
High School or GED
318 satisfied customers
My Carrier Gas Furnace will not stay lit. It is an induce
My Carrier Gas Furnace will not stay lit. It is an induce combustion furnace which is only a little over a year old. Model no. is 58STA . Here is what happens when you turn the furnace on: Induction f… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My Ducane furnace inducer keeps running without giving heat.
Draft inducer keeps running but heat will not come on, unless I turn it off, then back on. wWhat could be the problem?… read more
Kenton Guidry
Kenton Guidry
HVAC Technician
Vocational, Technical or Trade Scho
963 satisfied customers
I have a 1-1/2 year old ruud achiever 90+ furnace with a prog
I have a 1-1/2 year old ruud achiever 90+ furnace with a prog tstat. I came back from vacation to find my home at 58 degrees. I tried to bump the temp up on the tstat but the furnace will not kick on.… read more
JBM HVAC
JBM HVAC
HVAC/R Technician
Vocational, Technical or Trade Scho
50 satisfied customers
I have a rheem classic 90 plus, it is 3 years old. It is a
I have a rheem classic 90 plus, it is 3 years old. It is a gas furnnse. It is turning off and on, sometimes it does not fire up, and just blows cold air. Othertimes it runs like a champ.… read more
JBM HVAC
JBM HVAC
HVAC/R Technician
Vocational, Technical or Trade Scho
50 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