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Unit runs outside, but fan will not come on in the inside unit.

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Hello,

there are two 18 gauge wires going to your contactor coil the two wires will follow your line set out of your house and into AC to the contactor coil. usually red and white. or blue and yellow. make sure you have 24 volts with your volt meter (T-stat must be calling for cool). make sure you have 240 volts going into line side of contactor(L1 L2). there should be a run capacitor or two. usually a silver duel capacitor it will be round. is it mushroomed at the top? do you have voltage on both sides of contactor and 24 volts to contactor coil when thermostat is calling for cool?. and no voltage at capacitor or it looks mushroomed, you have a bad capacitor. the best way to test one is with a mircrofared tester. less then10 bucks to replace it will have a number ie. 35/5 uf if it is a duel. make sure you get the same one. if you don't have 24 volts to contactor coil or if contactor isn't pulled in. your problem is in the t-stat or funace. if you don't have 240 volts going into line side of contactor you have a tripped breaker or blowen fuse somewhere, or high pressure cutout needs to be reset due to dirty condenser.(usually only on Rheems) if you have 240 at line side L1 L2 and 24 to the contact coil but no 240 on T1 T2 of contactor you have a bad contactor which i would replace anyways since it sounds like it's buzzing. they are about 10 bucks too. let me know if this helped i'm pretty sure it's your capacitor. the capacitor if it's a duel will have three different terminal circles. C, fan, and Herm. C is for common it goes to the common wire on the contactor either a red or yellow wire. fan uses the wire coming from the fan and herm uses the wire coming from the compressor.

Take care.

Posted on Jul 07, 2010

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