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thermostat

  1. How to replace Honeywell 8 wire thermostat

    HVAC
    Hi Everyone, I am trying to replace one old 8 wire thermostat in my condo. But my new thermostat has only 5 wires, I don't know to do it, are there anyone who could help me out? Old model is Honeywell T8575D2003 New model is Honeywell RTH2300B Thank you very much.:smile::smile::smile:
  2. Old Furnace, New Thermostat

    HVAC
    Howdy to all, I have a maybe 30 some year old electric furnace and I want to change my thermostat to one that can automatically switch between heat and a/c as the season changes or the temperature dictates. Unfortunately, I won't be able to get into the room that has the thermostat until mid...
  3. Thermostats destroyed by outage in several homes

    Electrical
    Greetings. Two days ago, a power surge from an electrical storm destroyed at least 5 thermostats in our planned community neighborhood of 60 homes. In each instance, the thermostat was a Nexia/Trane model 624 (or similar), which was installed with the furnace by the same HVAC contractor (since...
  4. Help identifying thermostat?

    HVAC
    Folks: I'm moving to an older home that has a programmable (5day/2day) thermostat, but I dont have a manual for it and its settings are way out of whack. It does not seem to have make/model information on it that I have found. I have attached a picture of it. Does anyone recognize it? At least...
  5. Installed new thermostat heat and fan work, AC compressor wont turn on

    HVAC
    My AC has always worked fine. A couple months ago I replaced a battery powered thermostat with a Honeywell Wifi smart thermostat. The new thermostat needed a "C" wire for power and there was an unused dark blue wire behind the old thermostat so i connected it to the "C" port at the furnace...
  6. White Rodgers Tstat problem

    HVAC
    White Rodgers type 1F86-344 showing high 80s to 90s on set temp. I pulled batteries and replaced. Now shows 65 actual set temp 88. Looking in furnace decided to check vacuum tube on fan and see it is plugged with what appears to be calcium. Drilled it out gently into fan housing and now it sucks...
  7. Lennox iComfort thermostat S30

    HVAC
    I am getting a new thermostat for my Lennox furnace, replacing an old one. My question is: Can I place the hub and HD display units at 2 different locations way apart? (this model comes with a communicating hub and a HD display) Where is the actual temperature sensor built-in to sense the...
  8. Baseboard heaters & Low-voltage thermostat

    Electrical
    Hi all, I just moved into a new apartment, and the baseboard heaters in my living room (5 units) didn't seem to be responding to the thermostat on the wall. Specifically, they are always on, despite the thermostat being at 50 degrees and the room temperature at around 65. I disconnected the...
  9. Thermostat wired incorrectly to Boiler by Plumbers. Please advise.

    HVAC
    Hello, I'm new to this forum and have made this account to ask some questions. I really hope someone can help me. To cut a long story short, I hired some plumbers to install a new Vaillant Ecotec Pro 24 boiler and they told me that they can do all of the relevant electrical wiring themselves...
  10. Help with thermostat theory - controls circ pump?

    General DIY Discussions
    Hi, Newbie here. I have a question I hope someone can help me with. I have a burnum oil fired boiler with hot water baseboard radiators, circa mid 1970s. When I bought the house 17 years ago, the radiators banged a little when the circulator pump came on. I bled everything and the banging...
  11. Old Sears Power Miser 80 Furnace Fan won't turn on when set to "Auto"

    HVAC
    I have an old Sears Power Miser 80 Furnace and the fan blower won't turn on when the thermostat is set to "Fan Auto". The furnace ignites, the Fan Limit Control spins around while heating up and when it hits the fan notch, nothing happens. Eventually the furnace will reach the shut off notch and...
  12. Minimum outside temperature

    HVAC
    I have a Goodman Heat Pump Model GSZ160481BD (16 SEER, 48k BTU cool/heat, R-410A) and the back up heat is electric. We live in an area where the typical winter temps drop to below freezing (32° F) and can see low double- or even single-digit temps. I have replaced the old thermostat with an...
  13. Blank thermostat and AC cuts off

    HVAC
    Hi, all. My daughter is having a weird malfunction with her AC that is causing me quite a bit of confusion (though admittedly, I'm no expert). --She moved into a new house some months ago and came through the winter months with no heating problems. --Since she started using her AC recently...
  14. jumper needed ? wiring Lyric round thermostat

    HVAC
    Hi! Replacing Honeywell Chronotherm IV Plus thermostat T8611G2028 v0111 by Honeywell Lyric Round 2.0 thermostat RCH9310WF v5011 My primary source for heating and cooling is an American Standard heatpump Heritage 12 6H2024A100A5 plus an fuel furnace as a backup heating source. I assume...
  15. Thermostat with Multiple Programs?

    HVAC
    Is there a thermostat capable of two completely different programs? I don't mean different programs for weekday/weekend, or by day. I'm looking for one that can have two completely separate programs, and I select which one to use. Here's the reason: We have hot water baseboard. The...
  16. OvenThermostat Clicking while off

    Electrical
    I have a GE electric range. Recently I have been hearing thermostat clicking noises coming from the kitchen. I keep getting up to see if I have left the oven on. It is doing that while it is off? is it possibly haunted, or is there a scientific reason why this would happen?
  17. Installing a C Wire

    HVAC
    I just bought a WiFi thermostat that needs a C-wire for power. The thermostat I am replacing does not require one so I do not have one in the wall. I looked at the circuit board of my furnace and there is a C-wire attached and it appears to go out to the central air unit. Can I attach a...
  18. After messing with thermostat, HVAC won't turn on

    HVAC
    Turned off main power to 2H1C with Aux heat pump HVAC system to upgrade thermostat. Disconnected old mercury thermostat. Decided against installing new thermostat (got the wrong one). Installed old thermostat back in. Flipped main power back on. Now AC (or heating) won't turn on. What could I...
  19. Totaline P310 thermostat troubleshoot

    HVAC
    Hello, My basic Totaline P310 thermostat is doing something new: the clock resets and starts blinking. I reset the time and after about 24 hours it does it again. My batteries are not dead (there would be a low battery indicator that is not showing). It is turned 'off' for the summer...
  20. HVAC Theory - Settle An Argument

    HVAC
    Hello, First time poster here... Have a relatively new home, about 5 yrs old. A large HVAC unit in the basement of a 1.5 story home with an open loft to the 2nd floor. About 1960 sq. feet total. I share the house with another owner. For the sake of who's who, let's say I'm Green and he's...
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