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Installed a nest 3rd gen thermostat and turned power back on
Installed a nest 3rd gen thermostat and turned power back on - no response from stat? Help … read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
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Need to install master nest thermostat - 6 wire, older
Need to install master nest thermostat - 6 wire, older Honeywell - need wiring diagram … read more
Tamar D
Tamar D
Mechanic II
Vocational, Technical or Trade School
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Phil, I have just had a new Comfortmaker Heat Pump installed
Phil, I have just had a new Comfortmaker Heat Pump installed with a Vision Pro with RedLink thermostat. I had been using a Nest thermostat and was happy with it. I'm not pleased with the Vision Pro at… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
8,427 satisfied customers
I want to install a nest thermostat but I have a Honeywell
I want to install a nest thermostat but I have a Honeywell system with a EIM. Can I eliminate the EIM … read more
Rick
Rick
Supervisor
28,018 satisfied customers
Uh well are you a human and is this advice free? Just today.
trying to install nest thermostat, have a goodman furnace. i think i got the 4 wires correct but im getting just cold air blowing when setting to heat Installing a 3rd gen Nest thermostat. Had a thermostat working fine, White-Rodgers model # 1F78 NON-PRGM. 6 wires coming from wall, only using 4 on it. White to W, red jumper from Rh to Rc, Green to G, Yellow to Y, Red to Rc. No a/c, just a goodman gas furnace blowing into house thru vents. Model GMS80704BXCC. Installed new 3rd gen Nest, with yellow wire to Y1, green wire to G, Red wire to Rc, White wire to W. Nest thermostat comes on fine, fan blows for fan, fan blows for cool, fan blows for heat but no heat, its cool air. Brand: Goodman Type of HVAC: Thermostat Control… read more
Rick
Rick
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I'm trying to replace a cheap Honeywell thermostat which
I'm trying to replace a cheap Honeywell thermostat which controls a Lennox model CH33-44/48B-2F. All wires attaching from the model correspond with inputs into the Hive (like a Nest) thermostat EXCEPT… read more
Minke Bro
Minke Bro
Lead HVAC Technician and Trainer
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Furnace: Trane XV95 Thermostat: Honeywell TH9421C1004
Furnace: Trane XV95 Thermostat: Honeywell TH9421C1004 Control Module: Honeywell THM5421CThe center third of my thermostat's touchscreen is not working and I need to replace the thermostat. I cannot de… read more
Rick
Rick
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I am trying to hook up my Nest 3rd generation thermostat to
I am trying to hook up my Nest 3rd generation thermostat to my new apartment's system that was using a Braeburn thermostat. I have a photo of the wiring connections for my Braeburn thermostat. I need … read more
airheatman
airheatman
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6 years college
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I would like to change my HVAC thermostat to a different
Hello, I would like to change my HVAC thermostat to a different model, but need some help with installation.I currently have a Honeywell thermostat model RTH9580WF that is connected to a Honeywell Equ… read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
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I have the Honeywell 9421C1004 thermostat with the EIM in my
I have the Honeywell 9421C1004 thermostat with the EIM in my house on two separate units. One of the thermostats display was out, so I went and bought a Nest without knowing exactly what I was in for … read more
Regan Land
Regan Land
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Vocational, Technical or Trade Scho
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I have a zvc404-4 and a Honeywell perstige eim that controls
I have a zvc404-4 and a Honeywell perstige eim that controls my heat pump and electric forced air heat. I am trying to connect the taco zone one to the 3rd stage of backup heat on the eim … read more
gotoman for ac
gotoman for ac
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I have a question regarding connecting a nest (gen 3)
I have a question regarding connecting a nest (gen 3) thermostats to my HVAC system. Currently there are three cables to my Honeywell thermostat, which does to a Honeywell communication module, there'… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
14,295 satisfied customers
I am replacing a honeywell visionpro iaq thermostat with a
i am replacing a honeywell visionpro iaq thermostat with a 3rd gen nest thermostat. the honeywell iaq is connected to an eim. at the thermostat, there are 4 "unlabeled" wires. their colors are red, wh… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
14,295 satisfied customers
I have a honeywell th9421c4001 and it has 3 wires labeled
I have a honeywell th9421c4001 and it has 3 wires labeled 1,2, 3. I am trying to set up a nest thermostat (gen 3) and it is not working correctly. The Nest tech support doesn't know what those wires c… read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
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I am trying to install a NEST 3rd gen thermostat. I have an
I am trying to install a NEST 3rd gen thermostat. I have an oil boiler for baseboard forces water hear, and a ducted central AC. They are currently on 2 separate thermostats. I need to wire them toget… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
8,427 satisfied customers
I am not at the house, so I cannot check the heater but, I
I am not at the house, so I cannot check the heater but, I had a Honeywell VisionPRO® IAQ Total Home Comfort System that was digital and does not require batteries. The T\Stat display died (would not … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
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Install NEST Thermostat to replace Honeywell 7-Day Program
Current Thermostat: Honeywell 7-Day Programmable Honeywell Vision Pro IAQ (Model: TH9421C1004) Current Equipment Interface Module: Honeywell Vision Pro IAQ Current Furnace: Lennox Current Damper Actua… read more
Scott
Scott
Self Employed HVAC Service Technician
Associate Degree
400 satisfied customers
I have a Honeywell thermostat that is the second of two installed.
I have a Honeywell thermostat that is the second of two installed. I removed it to install the NEST thermostat and am trying to reinstall the Honeywell and do not know the proper wire configuration.… read more
R.G.
R.G.
318 satisfied customers
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Meet the Experts:

Phil

Phil

Mechanical Engineer

8,427 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

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35 years experience, HVAC

Matthew

Matthew

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14 years experience in the HVAC field of service, installation, Manual J & D calculations

Brian HVAC Guy

Brian HVAC Guy

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

Kenton Guidry

Kenton Guidry

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Tom

Tom

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A-1 Tech

A-1 Tech

Service Manager

526 satisfied customers

I have been in the HVAC business for over 40 years.

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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.

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