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Emerson Lennox Ducane Armstrong Furnace Blower Motor K55hxkpy-9740 Questions & Answers
Why is it whining and humming?
Sometimes a louver on the squirrel cage comes loose maybe from taking it apart...hand test every louver. You may find that you need a new one.
Why does the furnace blow 5 amp fuses?
Its drawing much to high amperage on startup. It may be dirty, unmantained, blocked with something, or a bad run capacitor. Likely, at this stage, it needs replacing. If its belt drive, be sure you have the proper slack and the bearings, if needed, are oiled and not faulty.
THE DRAFT BLOWER IS TURNING ON BUT NOT FIRING UP WORKING ALL DAY STOPPED OVERNITE
The induced draft motor has a induced draft proving switch that is a pressure switch , it resembles a silver round flat device about 4 inches across with 2 wires, it will have a tubing attached to it that also is attached to the induced draft assembly housing on a barbed port, this is how the induced draft is "proven" thus giving the A OK to go to the next sequence of operation which is ignition trial period, it will attempt a ignition sequence for about 30 seconds 3 times before it will lock out if it has a circuit board, if so a flashing code will be observed and the legend in the back side of the blower door will tell you the codes meaning.
What is wrong 80% of the time is the barbed port on the induced drafts assembly is obstructed by carbon and not allowing the pressure switch to "sense" / prove the induced draft motor is running. You can connect the pressure switches 2 wires after the induced draft begins, this simulates a operational pressure switch and should begin the ignition phase if all is well, otherwise if all safety's or high limits are closed, then the ignition module is bad.
This is for spark type, if you have a hot surface ignitor look to se if its broken or cracked or has a burned spot visible, if not try testing for 120 volts to it, if you read proper voltage, then the hot surface igniter is bad.
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