Kenmore Furnace

Just bought my house a few months ago and something isn't quite right about the central heat. It's a natural gas furnace (Kenmore Model #H8MPN100F14B).

When the heat is trying to come on, you hear the blower come on first, then after a few seconds it goes off. Wait a few seconds THEN you hear the furnace's pilot light lighting the burner. Then the blower will come on AGAIN, as it's supposed to.

Why is the blower coming on first when no air has been heated yet? Any ideas of what's wrong or what to look for?

The home was inspected before I purchased it, but the inspector did not find anything wrong with the furnace (it was still warm weather here, when the inspection was completed).

Thanks!

 

Can't seem to find any info with that model#. If it's a Kenmore it must be really old. Most likely has a fan limit switch that might be acting up.

 

This system was installed (new) in 2006, I believe. Maybe I wrote the wrong model # down. It's not visible on the systems itself. I'll check again, when I get home. Thanks for the response.

 

A gas, forced air furnace of 2006 vintage typically has two fans.

cer motor fan which circulates air into the furnace to burn the gas and then out the vent to dispose of it. That inducer motor should switch on whenever the thermostat calls for eat, and remain on until the thermostat no longer callsfor heat.

The other fan circulates room air into the furnace to be heated ad then out to warm air registers. That fan typically turns on a minute or two after the burners turn o and continues to run 2-3 minutes after the burners shut off to remove eat left in the heat exchange.

Take the cover off the burner compartment of the furnace and carefully observe the sequence of events which is happening and report that sequence here, in order and in detail.

 

OK, I stand corrected, I didn't think they made them anymore. The model number should be located in the burner compartment.

 

Model # H8MPN installed 3/2006. Not sure how to get into the burner compartment. I'll have to get someone to do that, and then I'll be back. Thanks!

 

Welcome to the forums.

It looks like your furnace was made by ICP/Heil for Kenmore. Can you check and see if this is your furnace ? Usually to remove a burner access cover you pull up on the fins in the top cover.

Hvac partners/docs/1011/Public/01/44101261106_ICP_8718.pdf