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PaPaDan 05-09-2006 02:21 PM

Need HELP in a hurry!!!!!!
Have a central forced air furnace and central air system. Thermostat set to fan only works right, Set to furnace and everything works right. Set to Air cond. and compressor kicks on but fan will not work. Pressure line is cold and return line is hot as normal. had an old programable thermostat with out any papers on operation or hookup. Replaced and problem stayed the same. Ideas please?

woodworkingmenace 05-09-2006 09:55 PM

If your coil is freezing up in the furnace, then you may be low on freon.

I had this problem. I have a leak in the unit some place, (seeps out an ounce over the Winter and cant find it yet, guy said to wait til it gets larger..sheesh). Every year, or every other year I have to get freon added so that it works all that year...

So, check and see if your coil in your plenum is frozen, or, if its dirty even (electronic air cleaner not working properly, or not cleaned every month, or the filters not replaced enough to get the dirt crudded in the coils...then it needs sprayed out with a special spray you can buy yourself and clean them).

Could also be a broken wire at the thermostat?? How about your breakers for the A/C? Wife called me at work, and told me that the A/C wasnt working, I called the repair man... found out the breaker wasnt on.. 40 bucks down the drain for nothing... sheesh! (Ya cant do a thing, from work, but let the experts at it, because a wife is not usually savy enough to know what or where the breakers are!)...

Ok, my two cents for what its worth, and a wee bit extra for the collection plate


Square Eye 05-09-2006 11:03 PM

I'm no HVAC man. But I've replaced so many temp sensors and contactors that I feel like I should be grandfathered in. I'd trace the wire back from the fan, checking for power with a meter, until you find power. Somewhere, there's a switch or a contactor not working. It may very well be a low freon condition causing the fan to not come on.

PaPaDan 05-10-2006 04:01 PM

Got to check out the furnace today and found out someone had disconnected the blower wire from the control module. Guess I should have taken a closer look before asking. Thanks everyone. Dan

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