Gas and Oil Home Heating Furnaces - furnace fan wont kick on

Furnace was working properly until a few days ago. Thermostat screen was going blank, and it had been acting funny for a month or so. Replaced thermostat-it appears to work fine-furnace does not. Fan will not kick on. When we tested it for power it appeared that blower motor did not work. Replaced blower motor today--still does not work.
The furnace produces heat, just no fan comes on to push it through the ducts. Does anyone have any ideas??
Thank you!

Hello Angie L

Based upon the information you provided, which is very good by the way, the problem just may be the fan switch.

The fan switch controls when the fan turns ON. The switch is heat sensitive. It senses the heat in the firbox and turns ON at a preset temperature.

If the switch has electrical current and fails to turn the fan motor on, the switch may possibly be defective. I do not suggest you attempt to make any adjustments to any dials on this switch.

For the Do-It-Yourself person, I suggest an exact OEM orginal replacement part.

USE CAUTION:
This switch uses full houseline voltage. Be sure the electrical power is positively turned OFF prior to beginning any removal and during replacement.

Remove the switch, take it to any local retail appliance parts store or the local authorized dealer for the furnace brand and purchase a new replacement.

Suggestions:
Read the manufacturers online web site for product information, problem solving methods, part locations, disassembly, reassembly methods, repair proceedures and instructions, pictorials and schematics, which may be available online.

Check the ARCHIVES, within this forum, for other postings on this topic and the replies offered.

Regards & Good Luck
Gas Appliances Forum Moderator
Tom_Bart...........Fast, Fair, Friendly & Highly Efficient.....:)
Energy Conservation Consultant & Natural Gas Appliance Problem Diagnostics Technician.

The answer to ANY and ALL generic questions is always:
....NO....unless indicated or directly stated otherwise.....:D

HI Tom
Thank you for your quick reply. After reading your message I've done some research on getting the fan switch. According to Sears
it is called a fan & limit control-am I talking about the right part?
My furnace is a Kenmore model #
Originally manufactured by Inner City Products

From the Sears website and 800# I would not be able to recieve the part until 12-26. I'm in Michigan so I'm hoping to be a little warmer before then. You stated an exact OEM original part would be suggested. Do you think that a universal part could work? Do you think that most h&c contractors would have a part like this or would they have to order it also?

Thanks so much-Happy Holidays and Keep Warm!

Hello AngieL

YES! If you can purchase the switch locally, at a local heating agency store or appliance parts store...by all means do so.

I am aware that some furnaces have a dual fan on and off {combo fan and limit} switch. I just negected to include it in my first reply back...:eek: but not to worry, I may have been having a short "Pre-Senior Moment" during the time of I was typing...:D

I do not normally suggest any generic parts be used or installed without actually determing the problem cause first hand. Since that isn't possible, visit one or both of the local parts stores and inquire there. Whether the part is stocked my answer would be most likely yes but you'll have to inquire.

Just be aware that electrical parts and or componets are NOT returnable nor refundable items when sold over the counter. But not to be too concerned with this. The part will not break the piggy bank....:) like those other parts you already installed.

Regards & Good Luck
Tom_Bart....TCB4U2B2B.....Company Enterprises
Fast.....Fair.....Friendly & Highly Efficient.....:D
Gas Appliances Forum Moderator
Energy Conservation Consultant & Natural Gas Appliance Problem Diagnostics Technician.