HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

I have a GNPN1 - 20-5 My board light is blinking 4 times.

Customer Question
I have a GNPN1...

I have a GNPN1 - 20-5 My board light is blinking 4 times. That part of the wiring diagram cannot be read. what does it say I need to check?

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

The furnace went down last night. I am troubleshooting this morning

Contractor's Assistant: Did you check the furnace's filters?

Replaced first thing this morning.

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

If I can. I wrote service manuals for 20 years for a commercial bakery equipment manufacturer. I am familiar with the operation of power burners.

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

I check the roll out thermostats and found one bad. replaced. air pressure switch good. hot surface ignitor has continuity but doesn't heat up.

Submitted: 7 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 7 minutes by:
12/26/2017
HVAC Technician: airheatman, HVAC Technician replied 7 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,368
Experience: Furnace, A/C and heat pump specialist.
Verified

4 blinks is an open limit circuit.Follow the entire circuit to locate all limits.May be one on blower housing that is often overlooked.If all limits are closed make sure we have continuity at board where the limit circuit leaves and returns.

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
I have a rheem RRKA-A042JK08E. The heater has stopped, though
I have a rheem RRKA-A042JK08E. The heater has stopped, though I've had intermittant running. Currently the iniator fan turns on for perhaps 10 seconds, there are two click (?circuit board and vacuum s… read more
airheatman
airheatman
HVAC Technician
9,368 satisfied customers
Hello, I have a Rheem Criterion gas furnace (Using propane).
Hello, I have a Rheem Criterion gas furnace (Using propane). Three days ago (Thursday) I woke up to a cold house, did some troubleshooting and saw that my ignitor had stopped working. I ordered anothe… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Bryant Model 395CAV042075 ACJA gas furnace. The blower
I have a Bryant Model 395CAV042075 ACJA gas furnace. The blower runs but the gas does not fire. Neither the inducer motor or the hot surface igniter is getting power. Are there any interlocks which co… read more
airheatman
airheatman
HVAC Technician
9,368 satisfied customers
Good afternoon, Goodman GMPN060 -3 Rev B led blinks 3 times on
Good afternoon, Goodman GMPN060 -3 Rev B led blinks 3 times on call for heat, fan starts, gas flows, ignitor does not glow. Replace ignitor, as I have done almost every 2 years? If you agree, please c… read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
I have a furnace (ruud) put a new board on. upon a call for
I have a furnace (ruud) put a new board on. upon a call for heat it does everything it should and after the burners are ignited they turn off. there is no flame sensor and I dont have a monometer.... … read more
airheatman
airheatman
HVAC Technician
9,368 satisfied customers
we have an old school trane heating + ac unit at our house
we have an old school trane heating + ac unit at our house - the old industrial kind - model no. ycc060f3m0bc. We have propane hooked up to it - everything is working except that it is not actually he… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My gas furnace will not ignite. Here is the initial cycle.
My gas furnace will not ignite. Here is the initial cycle. Post reset, a call for heat is made. The inducer motor spins up. I hear a click (pressure switch), another click (gas valve opening) and gas … read more
Tim H
Tim H
Lead building engineer
Vocational, Technical or Trade Scho
1,922 satisfied customers
icp furnace model#t9mpv075f12a1 serial#l012836314 wont light.
icp furnace model#t9mpv075f12a1 serial#l012836314 wont light. combustion blower comes on with call for heat,after purge igniter glows and gas valve wont open. all limit switches and pressure switches … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I am a HVAC contractor who is not very experienced on goodman
I am a HVAC contractor who is not very experienced on goodman equipment. I have a furnace I was looking at today and could not figure it out.That being said I will list all info i found on the unit to… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a 2006 Carrier 58MCA high efficiency furnace. We awoke
I have a 2006 Carrier 58MCA high efficiency furnace. We awoke to a cold house this morning. The blower fan seems to be operating but the burners are off. We had quite a snow storm last night with 5ft … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
have a york diamond 90 all blowers working - no pilot flame cannot
have a york diamond 90 all blowers working - no pilot flame cannot find a reset switch or ignitor --- any hints??… read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
My Trane XL 80 furnace is not heating. The red light is blinking
My Trane XL 80 furnace is not heating. The red light is blinking twice. Anything I can do to fi x that?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Carrier which I am guessing to be the same year as
I have a Carrier which I am guessing to be the same year as my condo's build, which is 1980-81. Looks to be the original. Anyhow, came home last night and the fan was running, there was a terrible bur… read more
Bart Jay
Bart Jay
Vocational, Technical or Trade Scho
596 satisfied customers
I have a lennox g24m3/4 furnace that cycles but will not ignite.
I have a lennox g24m3/4 furnace that cycle's but will not ignite. It is getting gas and I replaced the ignitor and it still won't light. What else could it be?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Coleman T.H.E. 90 Furnace when heat is called for
I have a Coleman T.H.E. 90 Furnace when heat is called for the hot surface ignitor glows the gas valve clicks as if it's opening but burner doesn't light… read more
Richard
Richard
District Technical Manager
Vocational, Technical or Trade Scho
1,416 satisfied customers
Have control board WR 50A55-843, I just replaced last night
Have control board WR 50A55-843, I just replaced last night thinking it was my initial problem after following the trouble shooting schematic. My LED on my last control board indicated Pressure Switch… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Heat will not kick in. Auto Fan and Cool ok - replaced batteries
Heat will not kick in. Auto Fan and Cool ok - replaced batteries and reset breaker. Just returned from trip - was working fine before.… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Own an Amana gas furnace Model G8170A30, having problem with
Own an Amana gas furnace Model G8170A30, having problem with intermittent heat need to know what the blinking light on ignition module means? Also, would like to download a service manual. E-mail: XXX… read more
HVAC22
HVAC22
Residential Service Team Supervisor
High School or GED
32 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