Outside Unit Runs , Indoor Blower Sometimes Does

by Will
(texas)

March 25, 2011



Ok, I have a Lennox central heat and air system in a house I just moved into. When I put the air conditioner mode on the outside system will turn on and at first the blower kicks in just fine. when it reaches the set temp in the house, the central ac unit shuts off (normal).

When the temp raises again the outside central unit kicks on like normal, but the blower inside will act like its starting then stop , and it will keep trying to do that every so often while the outside unit keeps running.

I am sure it is a issue with the blower. Funny thing is when I put it to on instead of auto the blower starts up just fine.

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starstarstarstarstar 		blower motor start and stop. NEW
by: charlie jones

I replace a heat strip in a old janitors ac united and I started the united up and the fan ran but out door united would not run in cool, but when I jump the wire across the terminal of the 24 volt wire that run to the out side united the blower moter stop and the out door united run and freeze up a litter bit until I take the jumper off and the fan start and out door united stop.
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starstarstarstarstar 		A/C can kicks in outside, compressor inside but can doesn't inside NEW
by: Rochelle

Help
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starstarstarstarstar 		Outside Unit Runs NEW
by: Anonymous

We're a group of volunteers and opening a new scheme in our community. Your site offered us with valuable info to work on. You have done a formidable job and our entire community will be grateful to you.

Alex

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starstarstarstarstar 		If the system does not run continously in "Fan ON" mode
by: EE with a minor in Home repair

If your indoor blower only runs occationally in either "FAN AUTO" mode or in "FAN ON" mode, then your fan relay board is suspect. First check the motor to see if it is actually cycling OFF while it is still recieving 24VDC. But if you have the unit on "FAN ON" and you listen to the relays and here them shutting off power to the fan then you can put your $30 into a new "Fan Relay Board".

Rating
starstarstarstarstar 		changing thermostat
by: Anonymous

I used electrical cleaner and cleaned the contacts in the thermostat . The blower worked normally for a while and then started shutting off again . I think I'll try a new thermostat before I call for help .
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starstarstarstarstar 		Blower Problem Also
by: Cecil Scott, Florida

I have the same problem, so I will try this, but your suggestion does sound right. If I play with the thermostat, then the air-handler/blower will come on, so I will change the thermostat this weekend, April 15th.
Cecil
Rating
starstarstarstarstar 		Blower Problem
by: Chester

Sounds like you have an issue with the thermostat. If the blower runs okay in the on position and has a problem in the "Auto" position you need a new thermostat. Contacts on the thermostat sub-base are worn or the contacts in the bulb are bad.

Replace the thermostat and sub-base. This is a fairly simple fix as you can buy the thermostat at any home improvement store. Pay particular attention to the wire colors and where they are connected on the old sub-base and write the connections down before you unhook them from the old sub-base.

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