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Thermostat will not turn on furnace. Stay blinking heat. Cleaned sensor.

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Is the inducer motor running?

Posted on Dec 13, 2012

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Check and make sure that you are getting 24v back on the white wire from the t'stat in the furnace. If yes than your problem is with the furnace. If no, your problem is with the thermostat. You need to establish where the problem is first.

Posted on Dec 13, 2012

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Posted on Jan 02, 2017

22yooper
  • 828 Answers

SOURCE: If I turn the thermostat

Inside your furnace will be a list of what the number of blinks means. These codes point to the problem that you have.

Posted on May 01, 2008

22yooper
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SOURCE: Carrier Weathermaker gas 8000 will not ignite

Your hot surface igniter may be bad. It may be cracked which would prevent it from starting the burner flame.

Posted on May 22, 2008

bobicehouse
  • 1524 Answers

SOURCE: the furnace will light up

First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

Posted on Dec 08, 2010

walterkunesk
  • 683 Answers

SOURCE: Good Morning, my york diamond

do you have to shut the furnace down (electrical switch) to get the fan to shut off?

Posted on Feb 22, 2011

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I have a proselect thermostat psts11p52 that's 3 months old. So is the furnace. The AC works fine. Today i set the heater because it's cold and the temp stays at 68. These are my steps. - switch to...


I'm thinking the heat blinking means its calling for heat and its not completed the Rh to W1 circuit yet. Once the circuit closes, the blinking heat will go steady....usually. Or if the thermostat is satisfied, it will stay steady and not blink...

I guess your thermostat could blink whether its mode is satisfied or not because I am not familiar with that particular stat. You forgot to say if the furnace is gas or electric heat, so if its gas, it sounds like it could have misfired and locked itself out. Go to the furnace, and cycle the power switch that should be mounted on the side. This will reset the controller and give it another attempt at firing correctly. If it continues to lock our after several attempts and you still have no heat, you have no choice but to call for service.

If its an electric furnace, there isn't much you can do but call a technician for a service call.

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Top rollout switch triggers with blinking code *6*, Furnace only runs with cover off


restart unit as soon as your inducer fan came on pump the 2 wires to pressure switch and wait to see how long it stay also watch the flame at the burner

Jan 27, 2014 | Goodman GMS90703BXA Heater

1 Answer

The furnace will light up and the fan will blow but the flames cut out before my house reaches temp. i have the thermostat set at 70 and the house will not get above 55. i have tried turning the propane...


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

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1 Answer

Furnace does not turn on normally


Having to reset it tells me that there is probably an error code blinking on the control board. Look for a small viewing port that looks into the cabinet. Count the number of blinks then remove the panels to find the wiring diagram pasted on one of them. On the diagram you will find a diagnostic code to help you narrow down the problem. It could be as simple as a plugged air filter.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Feb 07, 2010 | Goodman Heating & Cooling

2 Answers

FURNACE COMES ON AND SHUTS DOWN WITHIN 15 SECONDS


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control). When all else fails, check the ground connection for corrosion.

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2 Answers

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