Quote:
Originally Posted by dyost  Well, sorry to say but I can not help you because I have the same exact problem!!! The fire egnites but my blower does not kick on. It will ignite 5 times for a period of about 5 seconds and the blower for some reason does not kick on. It will then shut off for about 5 minutes and go through the same cycle. I have an Air Ease Furnace and hopefully someone can talk us through it. Good Luck. |
I'm supposing you have a furnace with a hot surface ignitor that glows white hot before the gas turns on and the main burners light.
I'm supposing that the blower you say is turning on is a small motor usually above the burners (called the inducer motor) and not the main fan motor located in the fan compartment.
I'm supposing that when the thermostat calls for heat, the inducer motor turns on and comes up to speed, then the ignitor gets white hot, you hear a click from the gas valve and the main burners light for about five seconds and then the burners shut off.
After five minutes it repeats that cycle.
Odds are that the circuit board isn't verifying that the main burner gas has lit, and is therefore turning the main burner gas off.
Usually that check is performed with the aid of a flame sensor which is located on the other side of the furnace from the hot surface ignitor, and is a small rod sticking up into the burner flames. The rod has a wire coming from the bottom and leading back to the circuit board. Sometimes that rod accumulates oxides on it which prevent the flame from getting to the rod itself, causing the circuit board to shut off the gas.
Correct diagnostic procedure is to verify that theory by measuring the DC microamps passing through along the wire from the flame sensor when the burner is lit, but most people just remove the flame sensor and clean it with a wire brush or a little sanding with fine sandpaper ---it doesn't take much.