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Why won't new thermostat won't turn on?

Followed the directions that came with thermostat. Turned breaker off, installed as instructed and turned breaker back on, thermostat doesn't power up. Double checked, no go. Should be noted that I'm replacing an old mercury thermostat that didn't require a C wire. Furnace has a C wire and was already wired in. Thanks for any suggestions.

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  • 38 Answers

Check that one of the wires has a voltage with a test lamp

Posted on Mar 24, 2014

  • Brent Shields Mar 24, 2014

    Bought a meter yesterday and able to test system to centralize my problem. Got it to work! Thanks

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Posted on Jan 02, 2017

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I am replacing the thermostat with the Ecobee3 lite smart thermostat. The thermostat did not power up. My A/C unit is a Carrier model 40AQ030300BB. Might I have popped a fuse or something?


yes you likely blew the fuse. it is likely a blade style/ similar to one in a car, located on a circuit board inside the blower compartment. BE SURE TO TURN POWER OFF AND LOCATE AND REPLACE WITH SAME THING!!

Nov 11, 2017 | Carrier Heating & Cooling

Tip

Thermostat Line Voltage How to Install or Replace


You either have a new line voltage thermostat or have to replace your old line voltage thermostat. In either case the process is much the same.

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  1. Make sure that all power is turned off at the breaker panel. Most heaters that use a line voltage thermostat usually use 240v current so the breaker will either be a double pole breaker or you will need to turn off two single pole breakers to kill all of the power.
  2. Check to see which wires are hooked to the breakers. In most cases it will be the red and black wires, but I have seen many times that the white and black wires were used. Often there is no red available when the white is used.
  3. Take out the two screws that hold the thermostat to the junction box. When you get the thermostat out make a note of which wires go to the heater (load) and which wires are coming from the breakers. (line)
  4. If you have a single pole thermostat installed one of the sets of wires may be wired straight through the box or have the line and load wires connected directly in the box. With a double pole t-stat you will have both sets of wires running through the t-stat.
  5. Remove the old thermostat and wire the new t-stat in the circuit with the load wires hooked to the load or heater and the line wires hooked to the wires coming from the breaker. Make sure to get a very good tight connection as resistance loads will heat up quickly if good contact is not made. This poor connection can and will start fires.
  6. Turn the power on and check the heater for heat output.
  7. Turn the power back off and carefully screw the thermostat to the junction box securely. Then you can reapply the power to the circuit.

Now you are up and running with a new line voltage thermostat installed.

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

on Jan 16, 2010 | Heating & Cooling

1 Answer

Eb20b/ electric furnance/ blower wont shut-off after heat kicks out, got to kill breaker , runs all the time, installed new thermostat, no change?????? Its cold??????


Check the thermostat and make sure the fan switch is set on "Auto". If it is set on "ON" the blower will run constantly.

Jan 31, 2015 | Heating & Cooling

1 Answer

FURNACE WON'T TURN ON: I have a 1999 Fleetwood, Prowler RV. The furnace won't turn on.


Check the exhaust port of the furnace. Wasps like to build nests in there and it will not allow the furnace to ignite if blocked. You have a gas detector and it is turned on I assume? I forgot this many times.

Apr 20, 2013 | Heating & Cooling

1 Answer

Honeywell ct3200 thermostat won't turn on


DON'T BUY A NEW ONE JUST YET! IF THE BATTERIES DIED & THERMOSTA LOST POWER, IT MAY HAVE LOST IT'S MEMORY. IT MOST LIKELY WENT BACK TO FACTORY DEFAULT SETTINGS, & NEEDS TO BE RE-PROGRAMMED THROUGH THE INSTALLER SET-UP MENU. HOPEFULLY YOU HAVE THE PAPERWORK FOR THE THERMOSTAT STILL & CAN POSSIBLY DO THE SET-UP YOURSELF. IT SHOULD HAVE STEP BY STEP INSTRUCTIONS FOR THIS IN THE INSTALLATION GUIDE (NOT THE OWNERS MANUAL)

Oct 13, 2012 | Honeywell Programmable Thermostat Heater

2 Answers

New battries in Duracraft Programmable Thermostat for A/C...still won


Remove the thermostat and just touch the wires together and make it run until heat wave is over then figure it out. Kinda of a pain but at least it be cool

Aug 07, 2017 | Honeywell Electronic Programmable...

1 Answer

HP D135 - replaced printhead - still doesn't print in that color


try this link : I followed the directions and fixed the problem. the instructions that came with the new printhead weren't really complete.

Here's essentially all I did for my fix - Opened the printer top, turned the printer off. Removed the "bad" printhead, cleaned the metal contacts on the printhead and printer with windex. Closed the printer. Turned it on. waited for it to reset. Opened the printer. Turned the printer off again. Installed the printhead. Closed the lid. Plugged the printer in again. When it was ready I accessed the HP toolbox and alligned the printheads and cleaned the printheads. It worked. Here's a link with photos.


http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpa02107&lc=en&cc=ca&dlc=&product=64986

Oct 18, 2008 | HP OfficeJet D135 All-In-One InkJet...

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