Save these instructions for future reference. I changed the smart value around 4weeks ago, furnace worked for 2 weeks then started to short cycle so i cleaned off the flame sensor and it worked for a week. My furnace isn't working, what should i do first? Look to see if the pilot light is lit if your concord furnace is powered by natural gas. 80% furnaces may be common vented with another appliance in certain circumstances. For example, concord furnace 3 flashes mean problems with pressure. Gas Furnace Limit Switch Troubleshooting Replacement Youtube from i. If the pilot light is out, relight it with a fireplace match if you . Manual valve shut off, proper flame sense microamps, gas valve defective or gas . If the pilot light is out, relight it with a fireplace match if you . Look to see if the pilot light is lit if your concord furnace is powered by natural gas.
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