Author Topic: Inside blower not coming on!  (Read 3300 times)

Offline metaldrivensoul

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Inside blower not coming on!
« on: May 31, 2007, 10:16:25 AM »
I've been having a problem with the inside blower not coming on on my central a/c unit. What's basically happening is that im setting my thermostat (older type with the liquid mercury) to 76 degrees and its also set to "auto". The unit will operate properly for random times...sometimes 10 hours and other times only 30 minutes or so.  Eventually the inside blower will just not engage. The outside unit comes on and I can feel that freon is flowing through the evaporator coil but the blower just sits still. Ive taken off the face of the thermostat and checked and the "circuit" is being made with the liquid mercury so the inside blower should have powered on. The way i get it to engage is to take the thermostat and move it upwards to where the mercury moves and breaks the circuit then i lower it again to complete the circuit and voila the blower comes on. Its been giving me this problem for about 2 weeks now and ive had someone out to my apt 4 times to check on it. Theyve changed the thermostat and checked the wiring and freon levels and everything is seemingly normal. Anyone have any suggestions?


Offline TECH X

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Re: Inside blower not coming on!
« Reply #1 on: May 31, 2007, 09:19:28 PM »
Sounds like your fan control board or relay is faulty.  Or maybe the motor itself is overheating and going off on overload.  It's hard to say exactly without knowing what kind of furnace or air handler you have.

Either way, if they havn't figured it out in 4 visits, I would call another company.  ;)

Offline mrheatpump

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Re: Inside blower not coming on!
« Reply #2 on: August 23, 2007, 09:12:22 PM »
check your relay if you have 24vac going into it then its your relay.but if you dont have any power going in it might be your board.i had the same problem with 10 heatpumps.outside unit will come on but not the inside so that makes the outside unit ice was the relay