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Regarding the c wire issue and the RTH6500 thermostat. I
Second opinion] regarding the c wire issue and the RTH6500 thermostat. I notice on my existing thermostat wiring there is a terminal marked "RC" with two wires. One of the two wires goes back to the l… read more
airheatman
airheatman
Heating & Air Conditioning Contractor
6 years college
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I just bought an Emerson 1F83C-11PR single stage thermostat
I just bought an Emerson 1F83C-11PR single stage thermostat to replace a very old one. There is only one existing "R" wire (red) from my electric A/C-heating unit, but both RH and RC terminals on the … read more
airheatman
airheatman
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Replacing an old thermostat when I was removing the wires I
Replacing an old thermostat when I was removing the wires I saw a white, green, yellow and red plus the addition of a small red wire that ran from RC to RH what do I do with that wire … read more
BillyHvac
BillyHvac
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I have a RTHL3550D1006 and i am trying to install in my
I have a RTHL3550D1006 and i am trying to install in my house the original thermo has two red wires connected to the RC i have another red wire connected to RH how do i connect these red wires since i… read more
Phil
Phil
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Degree, Mech Engr Technology
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Mark! I have a Trane XE1000 Heat Pump and I'm trying to
Hi Mark! I have a Trane XE1000 Heat Pump and I'm trying to wire a new RTH7600 series Honeywell Thermostat with the following wires on the old thermo: C,G,Y,O,R,W2 (with a jumper between R and RC). I m… read more
gotoman for ac
gotoman for ac
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Need assistance with a couple wires and a config option on
Need assistance with a couple wires and a config option on honeywell HZ322 zone controller… read more
BillyHvac
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Nest thermostat troubleshooting- No air conditioning.
I recently changed my 2 zoned home to 2 nest thermostats. For the past two months the heat has been working fine, however, now that I need A/C it is still pumping out hot air. I've felt the insulated … read more
gotoman for ac
gotoman for ac
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i have an older white rodgers LR27935 type1F56-444 and want
i have an older white rodgers LR27935 type1F56-444 and want to hook up a honeywell RTH2310/RTHL221 series. The wires on the older thermostat have the - red/green connected & the black/yellow connected… read more
Jerry
Jerry
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i have a heat pump system (carrier-model#517EN030075)trying
i have a heat pump system (carrier-model#517EN030075)trying to change thermostat,does this unit have an auxiliary/backup or multistage system? Existing Day n night thermostat has a switch(EM.HT.)???.w… read more
A-1 Tech
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Im installing a redLINK wireless thermostat kit (YTH6320R1001).
I'm installing a redLINK wireless thermostat kit (YTH6320R1001). I removed old programmable thermostat (Sears) and installed EIM in same location as a test before I attempted to install next to the fu… read more
Douglas
Douglas
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I just installed ADMH110 series. Not working My wires are
I just installed ADMH110 series. Not working? My wires are white, red, green, and blue. I have blue on c, green on g, white on white, and red on y.… read more
N4IEA
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Trying to replace a Chronotherm iv with a RTH7600. AFAIK I
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gotoman for ac
gotoman for ac
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OK, I WILL TRY TO EXPLAIN WHAT I HAVE. THE EASY PART IS WHAT
OK, I WILL TRY TO EXPLAIN WHAT I HAVE. THE EASY PART IS WHAT I AM WANTING TO INSTALL. THE NEW SYSTEM IS A HUNTER, MODEL 44860. WHAT I HAVE, NO NAME THAT I CAN SEE. ON TOP TO THE LEFT IT SHOWS "FAN" WI… read more
Heath Moyer
Heath Moyer
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I have a heat pump with back up oil. The oil tank is full
I have a heat pump with back up oil. The oil tank is full but I cannot get any heat from either, the oil can be switched on by jumpering the white and black terminals on the oil control box. The origi… read more
Rick Mather
Rick Mather
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I have all the wires for my new PRO TH4000 Series Thermostat,
I have all the wires for my new PRO TH4000 Series Thermostat, model TH4110D, connected except the red (Hot?) wire. Not sure if I need to remove the factory installed jumper or not. Can you help?… read more
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Hi Ive purchased a R.S, 9400 t-stat, to replace existing
Hi I've purchased a R.S, 9400 t-stat, to replace existing R.S. heat pump t-stat (not sure, possibly 9401) and would appreciate some help with terminal connections. Existing connections are; C- blue, R… read more
Matthew
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removing and old honeywell heating thermostat and installing
removing and old honeywell heating thermostat and installing a VisionPRO TH8000 series , old thermostat turns on hot water pump by means of a relay . I have 3 wires on old thermostat one on RH one on … read more
BillyHvac
BillyHvac
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Hi, just bought a Honeywell thermostat RTH7600 Series (7 day
Hi, just bought a Honeywell thermostat RTH7600 Series (7 day cycle). My system natural gas forced air heat, no air conditioning. I have only 2 wires running to the thermostat, black and white (this is… read more
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Meet the Experts:

Phil

Phil

Mechanical Engineer

7,791 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

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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.

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Kenton Guidry

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Rick Ridley

Rick Ridley

UK Heating Engineer

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Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

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16+yrs HVAC/R service. Residential Commerical Industrial

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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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