How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Tim H. Your Own Question

Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3147
Experience:  Experienced in all aspects of HVAC, both residential and commercial.
27228809
Type Your HVAC Question Here...
Tim H. is online now
A new question is answered every 9 seconds

Thermostat is showing lower temperature (54 degrees) than set

Resolved Question:

Thermostat is showing lower temperature (54 degrees) than set temperature (72 degrees). Cold air is coming through registers
Submitted: 3 years ago.
Category: HVAC
Expert:  Tim H. replied 3 years ago.

Tim H :

Thanks for giving me the opportunity to help! Make and model number of furnace? Are you getting a LED diagnostic code?

Customer :

No. Display just shows HLD 53 degrees, even though I tried to set it at HLD 71. Arrow is also pointing to SYSTEM ON.

Tim H :

Make and model number of furnace? Are you getting a LED diagnostic code?

Customer :

Frigidaire heating & cooling unit. Model C38A 036A. I don't think the thermostat has an LED diagnostic code.

Tim H :

The LED code would be on the furnace, most likely on a lower door and inside a small window.

Customer :

I will check for it now. Be back shortly.

Tim H :

OK

Customer :

Theres

Customer :

There's a sticker above the condenser pump with the following: FG6RA 072C 12 A. I also took the door off the furnace. The door has a status red light column. The red light in the furnace is flashing once periodically, which lists limit circuit open or external load on W as the fault condition. There are also operating instructions to turn off the gas to the appliance. This unit does not have a pilot.

Tim H :

????

Tim H :

Do you have blower if you turn thermostat to fan "on" position?

Customer :

Yes, and now it is blowing cold air.

Tim H :

You most likely have an open limit switch, then

Customer :

What does that mean?

Tim H :

It means one of the limits, either the main or flame rollout switch is open.

Tim H :

I can't bring up anything with that model number you gave me.

Customer :

I have the wiring diagram for the furnace. It says it's for 78+ 80+, 90+ & 93+ model furnaces. Does that help? Should I try turning the furnace off and then on again?

Tim H :

Flame rollout switch should look like this

Customer :

I will see if I can find this switch on my furnace. Should I try to close it?

Tim H :

Yes, it has a reset button

Tim H :

The high limit, if it's open is not resettable. It should reset by itself, otherwise replace.

Customer :

OK. I will try to find it. Also, I did see a narrow red lever outside the furnace. It kind of looks like a pilot light.

Tim H :

OK

Customer :

I will be right back.

Tim H :

OK

Customer :

I didn't find the flame rollout switch, but I found the model number: FGRA 072C 12A. I also found what looks like a black arrow on a circle that was pointing to ON. I can switch it down to OFF. Don't know if that does anything.

Tim H :

I don't know what that would be... We are talking about a Frigidaire forced air furnace, right?

Customer :

Yes

Tim H :

There should be a high limit switch right above the burners.

Tim H :

How old is this furnace?

Customer :

I think it's about 8-10 years old. Also the operating instructions on the door say that the unit does not have a pilot, but it has an ignition device which automatically lights the burner.

Customer :

Sorry, hit the reply key too soon

Tim H :

Here are some high limit controls. Any look like yours?

Tim H :

May also look like this.

Customer :

The operating instructions also say that the black knob is the gas control knob. It says to turn it off for five minutes, then on. I am going to try that and also look for the high limit controls. Be back shortly...hopefully!

Tim H :

OK. This may take a while so I'll switch to Q and A mode. You can still post questions.

Expert:  Tim H. replied 3 years ago.
What Happens Now?

Your chat has ended, but you can still work with your Expert to get an answer to your question if you have not yet received one.

Come back to this page at any time to see additional information from your Expert.  You will also receive an email when your question is updated.  If you want to send a message to your Expert, use the box below.

If you have already received a satisfactory answer to your question, click the Accept button above.  Experts are credited for each accepted answer they provide.
Expert:  Tim H. replied 3 years ago.
I'm still here, but we're not in chat mode anymore...
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3147
Experience: Experienced in all aspects of HVAC, both residential and commercial.
Tim H. and 4 other HVAC Specialists are ready to help you

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. Jimmy Bagley, IA
< Last | Next >
  • 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. Jimmy Bagley, 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial