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I HAVE A CRITERION 1 THE FAN GOES ON, THE IGNITER GOES ON, THE BURNERS GO ON FOR ABOUT 10 SECONDS THEN OFF, BUT THE UNIT BLOWS COLD AIR

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Sounds like you might have a flame prove switch either dirty or maybe not grounded tight.

Posted on Mar 13, 2011

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fscanlan_0.jpg

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Have a rheem criterion II. Model


The way it lights is that the gas is spread from one burner to the next by either a flame tray or small holes drilled in the burner tubes. If the flame does not get all the way across the burner tubes within a few seconds, the unit goes out on failure. Clean and inspect each burner tube, not just the orifice. Clean any tray that connects the burners. You can use a small wire brush or tooth brush but be careful near the glow igniter as it is very fragile.

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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).

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Unit blows cold air. Igniter continues to try to ignite burners but no burners light.


if you are getting that far in the sequence see if you have 24v to the gas valve the gas valve could be bad or if your unit starts a pilot flame you might have a clogged pilot tubing could you post your brand model ande serial number if your problem is not resolved

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They sit directly in the flame pattern in front of the burners.

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Blower works but no heat


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Always check little things like air filter, condensate drain and broken or loose wires.

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