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My heater is blowing cold air

I have a goodman AR48-1

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  • 148 Answers

Check high limit safety switch

Posted on Feb 06, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

aries_67
  • 1 Answer

SOURCE: 1993 goodman status light 4 times blinking

I have a goodman GMP075-3 that won't turn on. I think it is the pressure switch since I do not have a vent blockage. What is a venter and where can I find it??

Posted on Dec 30, 2008

  • 189 Answers

SOURCE: The Heater is only blowing cold air

I would need a lot more info. if this is a natural gas furnace you may have a bad hot surface ignitor

Posted on Mar 28, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: my heater blows cold air. any ideas?

Your unit has a diagnostic light on the circuit board. You need to look thru a small viewing port to see it. Once you count the number of b links, remove the lower panel and look at the wiring diagram for an error code chart. Then read the following to give you some ideas what to do.

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).

Posted on Dec 01, 2009

  • 185 Answers

SOURCE: DAEWOO MATIZ 800CC 1999 HEATER BLOWING COLD AIR

Or you need anitfreeze.
Or your thermostat is shot. Both are easy fixes.
Try the antifreeze, first,check and top off.

and if teh problem persists, check and repalce the thermostat.

Posted on Feb 02, 2010

heatman101
  • 43501 Answers

SOURCE: reddy heater blows cold air

Hi,
Here are a couple of tips that I wrote that tell you how to troubleshoot aTorpedo or Reddy heater...

Reddy Heater - Troubleshooting Torpedo Heaters Torpedo Heater Pump Pressure Adjustment
heatman101


././

Posted on Oct 31, 2010

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