HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

My air handler runs continuously when emergency heat is on

Customer Question
due to temperature drop causing...
My air handler runs continuously when emergency heat is on due to temperature drop causing heat pump to shut off. There is a 3 wire thermostat wired at the heat pump that shuts it off forcing the emergency heat to come on. We want the air handler to shut off when not heating. The heat pump is a Goodman GSH140601AA, Air Handler a Goodman AEPF 426016AA with a control board P/N B1368274 Rev B and a Honeywell TH6220C1002 thermostat. My question is should dip switch 4 be on or off. It is currently on. Everything seems to work properly when the heat pump is on.
Submitted: 6 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 1 day by:
1/5/2011
HVAC Technician: Douglas, HVAC Technician replied 6 years ago
Douglas
Douglas, HVAC Technician
Category: HVAC
Satisfied Customers: 3,089
Experience: Manufacture Rep for Major Brand, Technical Trainer, NATE
Verified
Hi, I'm Douglas and I am here to help you resolve problems with your heating and cooling equipment.

Why would you shut the heat pump off at all?
Ask Your Own HVAC Question
Customer reply replied 6 years ago
My heat pump burned up a compressor in a little over a year. The professional installation people said that it should be shut off when the temperature drops below 20 degrees so they installed an outdoor thermostat that is connected to the heat pump control wiring forcing the emergency heat to come on when the heat pump shuts off. The thermostat is a 3 wire unit but is not connected to the air handler control board. The installation was installed by a local professional. They had to make 3 trips to get the thermostat wired correctly. Now I'm suspicious about their competence. I have been an electronic technician and an electrician so with some information I feel that I can do better. I've ordered a new Honeywell TH8320U1008 thermostat hoping it will be able to shut off the air handler. The heat pump shuts off the air handler just fine and I can force it to shut off by setting the temperature 2 degrees lower. 1 degree won't work. The difference I notice is a double click from the thermostat when the heat pump shuts off and only a single click when the emergency heat shuts off and the air handler continues running. I'm convinced it's a thermostat problem. This thermostat is a new one that the professional replaced thinking it could be a problem. I think that the outdoor thermostat is not installed in a normal manner so the thermostat is trying to perform a function that it is not designed to do. There aren't enough wires from the heat pump to the air handler to send an outdoor thermostat signal back. The run is quite long and would be very difficult to add additional wires.
HVAC Technician: Douglas, HVAC Technician replied 6 years ago
The fan is run by the G terminal, the thing they did, and who knows why because heat pumps still produce heat at 20 degrees. While it may not be enough, you would only need to supliment the heat when it gets colder. If the compressor burned up, its not because it ran in cold weather. Its because the refrigerant flow was not right, there was an electrical issue or the oil was not being returned to the compressor properly (refrigerant issue). Maybe an equipment mismatch, metering issue, or improper line set.

The outdoor thermostat they installed is proably doing nothing but redirecting the Y call at the outdoor unit back to the W Circuit. We use something like this in a dual fuel application where you cant run both at the same time, in a straight heat pump, they do run at the same time.

The only way to stop this is by adding a series of relays or by manually switching from heat to emergency heat where the fan is controlled by the heat sequencer. Heat pumps will run about 50% capacity at 10-15 degrees outside but they still draw less power per btuh by about half over strip heat so you always want to take the benifit of it.

The problem with the way they have it wired is it never really satisfies the thermostat. It satisfies 2nd stage, but not 1st stage, leaving your fan on constant.
Douglas
Douglas, HVAC Technician
Category: HVAC
Satisfied Customers: 3,089
Experience: Manufacture Rep for Major Brand, Technical Trainer, NATE
Verified
Douglas and 87 other HVAC Specialists are ready to help you
Ask your own question now
Ask Douglas Your Own Question
Douglas
Douglas
Douglas, HVAC Technician
Category: HVAC
Satisfied Customers: 3,089
3,089 Satisfied Customers
Experience: Manufacture Rep for Major Brand, Technical Trainer, NATE

Douglas 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

6,730 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
I have Goodman AC unit and Heat pump system. I am not
I have Goodman AC unit and Heat pump system. I am not getting the contactor for the fan and compressor to run when calling for heat and/or cool air. I've changed the run capacitor and contacter and ne… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,078 satisfied customers
I have a carrier infinity and it says sensor error outdoor
Hi I have a carrier infinity and it says sensor error outdoor sensor malfunction … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I need help wiring a new honeywell smart thermostat into my
Hello, I need help wiring a new honeywell smart thermostat into my older trane heat pump system with a 2 stage compressor. … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
I have a Trane XV95 model TUY100R9V4W which is a Two-stage
I have a Trane XV95 model TUY100R9V4W which is a Two-stage variable speed gas furnace with a heat pump, steam humidifier, & electronic air cleaner connected to a Honeywell HZ322 zone controller. This … read more
Michael Ferryman
Michael Ferryman
82 satisfied customers
I own a two story home with 2 split systems heat pumps. The
I own a two story home with 2 split systems heat pumps. The upstairs is almost never occupied so the air conditioning is set to run only occasionally. Trouble is, in South Alabama, the humidity is ver… read more
Charles Bodenheimer
Charles Bodenheimer
Owner
Associate Degree
78 satisfied customers
Heat pump with gas piggy back. Noticed house temperature
Bryant heat pump with gas piggy back. Noticed house temperature below setting where switch to auxiliary backup should have occurred, but gas piggyback was not running. Outdoor unit was not running (ne… read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
My heat pump switches to axillary heat when I advance it 1
My heat pump switches to axillary heat when I advance it 1 degree and the temperature is well above 40 outside. … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
I have a trane heater model number 4WCZ6036b1000AA AND A
I have a trane heater model number 4WCZ6036b1000AA AND A TRANE THERMOSTAT MODEL NUMBER TCONT802AS32DAA I CAN NOT GET THE HEAT STRIPS TO COM ON UNLESS I PULL THE COVER OFF THE UNIT AND MANUALLY PUSH TH… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My carrier tech2000ss worked fine until 2 days ago. the
my carrier tech2000ss worked fine until 2 days ago. the power went out once and twice today. now it runs but does not cool.… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I recently purchased a Nest thermostat (3rd generation) to
I recently purchased a Nest thermostat (3rd generation) to replace my current Trane BAYSTAT240 thermostat. As you may know, the wiring labels don't exactly pair up. I am looking for some advice to ens… read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
I have a 2 stage split system heat pump with electric
I have a 2 stage split system heat pump with electric emergency heat. They are both Nordyne. The outdoor model is JT4BF-048KA. The indoor model is B4VM-X48K-C. I want to connect a Gen 3 Nest thermosta… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I am also having trouble with my tayplus and would like to
I am also having trouble with my tayplus and would like to eliminate it. My thermostat is a honeywell 8320. how do i use it to eliminate the tayplus?… read more
Scott
Scott
Self Employed HVAC Service Technician
Associate Degree
399 satisfied customers
Your offer wasn't able to be seen. My 20KW Electric Furnace
Your offer wasn't able to be seen. My 20KW Electric Furnace (68,240 BTU's) 5 Ton Goodman you helped to wire two 60 amp breakers with #6 wire. We have nothing working. I flip breakers at box then on fu… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have a Trane XE 1100 Heat Pump. IT failed to run this
I have a Trane XE 1100 Heat Pump. IT failed to run this AM, air handler seems to operational as the strip heat and blowers are operational, the heatpump is not engaging and is making a buzzing sound w… read more
jhvac
jhvac
2 satisfied customers
yesterday morning about 6 am, the heat pump fan was running
yesterday morning about 6 am, the heat pump fan was running blowing cool air and the indoor temp was 68 degrees and the thermostat was set at 71 and the outdoor temp was about 36 degrees. We cut the p… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a new house with a new heat pump. Every time the heat
I have a new house with a new heat pump. Every time the heat comes on it runs a few minutes then brings on the aux heat. I know this is normal when outside temps are very cold but it is turning on aux… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
i am looking for outside sensor and interface circuit sl-odt
i am looking for outside sensor and interface circuit sl-odt fora 300-208 thermostat. i have one now but do not work any more .… read more
AssuredElectrical
AssuredElectrical
Electrical Contractor
High School or GED
332 satisfied customers
On a Chromalox HAF-320 electric furnace - What is the O terminal
On a Chromalox HAF-320 electric furnace - What is the O terminal used for? I see that it is jumpered to the R terminal.… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 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