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My Carrier gas furnace (ser. 1903A41848) located in the attic, is five years old and suddenly won't light. IT cycles the fan when I cycle the power to the unit and seemingly attempts to ignite through 3 auto-attempts, (I can smell the gas), yet no continuous operation with heat occurs afterwards. Two lights exist on the exhaust vent both begin green yet one turns red after the ignition attempt. Please let me know your thoughts. -Doug

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The igniters bad or if unit ignites the flame sensor is bad try this first

Posted on Jan 04, 2009

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Try the fuse ,check the ignition element .do You have a drip leg on your gas supply line just before the gas pipe enters the furnace .if not your gas valve maybe folded .

Posted on Jan 04, 2009

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Gas furnace short cycles 2 minutes or less. Multiple troubleshoot steps and replaced components - no help. Any advice?


I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
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