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I Have an older model of the white Rodgers thermostat and yesterday we adjusted it's place on the wall. In the middle of the night it was freezing and after some troubleshooting i realized the black wire had come off. I reattached and the heat came on fine. I fell asleep and woke up to it on and roasting. It hadn't shut off. Replaced the batteries and reset the temps and it still Wont turn off at the setting or any setting for tht matter. Help! I can't keep putting it on every half hour to warm up my house all winter. Thanks

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  • Heating & Co... Master
  • 1,394 Answers

I assume you are turning it off at the breaker??? Turn off unit at breaker. Remove "r" wire from tstat. Turn power back on. If heater still runs the problem is inside the unit (contactor or relay stuck) if the heater does not run you need a new tstat. Good Luck!!

Posted on May 06, 2017

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  • Master
  • 604 Answers

Get a new thermostat

Posted on May 06, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

the dr
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SOURCE: Carrier Natural Gas Furnace/Air Conditioner, Model 518CXX036000MBAA

Is this a package unit??? Or is it inside the home?? How old is the furnace. The first thing to do is axcess the fan and see if it is controlled by a computer or its old enough to have a fan switch. Trace the red wire from the fan mtr that should take you to the fan switch

Posted on Dec 01, 2007

  • 230 Answers

SOURCE: will not shut off

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

  • 24 Answers

SOURCE: RUUD (Protech Model 500) Thermostat Single Stage Not Programable

problem is not the thermostat, thermostat is an on-off switch that happens to work on temperature. Your furnace is locking out. cycling the heat off switch resets the micro-processor in the furnace. You need to diagnose the problem in the furnace, to go further we will need the model and approximate age of the unit

Posted on Dec 18, 2008

mastatech
  • 478 Answers

SOURCE: Heat pump cycling on and off.

It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.

Posted on Mar 11, 2009

  • 127 Answers

SOURCE: a duo therm thermostat (p/n 3105058) was removed

a. Remove the cover of the thermostat.
b. Connect the RED wire from the air conditioner
to the “RC” terminal on the thermostat.
c. Connect the “YELLOW” wire from the air conditioner
to the “Y” terminal on the thermostat.
d. Connect the “BLUE” wire from the air conditioner
to the “H” terminal on the thermostat.
e. Connect the “ORANGE” wire from the air conditioner
to the “G” terminal on the thermostat.
f. Push the thermostat wires into hole in wall and
fill excess hole with insulation.
g. Mount thermostat base to the wall with screws
provided.
h. Check all thermostat wires on base to ensure
they are completely clear of the bimetal coil of
the thermostat. Adjust if necessary.
i. Replace thermostat cover.
If nothing operates on the air conditioner, remove the
return air grille assembly and verify the red, orange, yellow
and blue wires are properly connected (red-to-red,
orange-to-orange, etc.).
Next, disconnect the red wires and check for 12 volt
DC between the red wire from roof section and the orange
or blue wire from roof section. If no voltage received,
refer to Section F2. If voltage is received, the
problem lies with the thermostat or thermostat wires.
Next, disconnect all 4 wires (red, orange, yellow and
blue) from the thermostat. With the thermostat set on
COOL mode, FAN mode set on AUTO and HIGH, and
temperature selector set lower than the room temperature. Check for continuity between terminal RC (red wire)
and terminal G (orange wire); and RC (red wire) and
terminal H (blue wire). If continuity is achieved on each,
proceed with the next step.
Set fan switch to LOW. Continuity should NOT be present
between terminal RC and Terminal H, but present between
the other terminals (Y & G) and terminal RC.
If all of the previous checks are good, the thermostat is
good, do not replace it. If any one of the previous checks
are not correct, replace the thermostat.

Posted on Jun 29, 2009

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  • Sincerely,
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