IF I TURN MY CENTRAL AC ON FROM THE BREAKER SWITCH I HEAR A CLICK FROM THE UNIT BUT THE FAN WILL NOT COME ON THE BLOWER INSIDE MY HOUSE WORKS FINE BUT AIR IS NOT COLD

Check that the filters are clean, Common failure on most air cons. If they are blocked or dirty, the indoor unit gets really hot and keeps switching off as it thinks it has reached room temperature. WASH the filters in water. Dont vacuum or brush them.

its look like blower problem , 1st check blower speed controller, check blower motor , check its ball bearing etc , its does not have any link to external unit .

click this link for video of switch replacement on DC07
http://www.videojug.com/film/how-to-replace-a-dyson-switch-and-actuator-dc07

see this step: God bless you
Check the house circuit breaker to see if it tripped?
Click here if you own a Vacuflo Central Vacuum Unit continuously trips your circuit breaker
If it is tripped, then turn off your central vacuum unit and reset the circuit breaker. Then turn the central vacuum unit on. If the circuit breaker trips again, then refer to the following:
Determine if the house circuit your vacuum unit is on has sufficient voltage required.
If your unit has a reset button, press the button and try again.
Cross the low voltage wire from the relay at the unit with a small screw driver. If you hear the relay click you need to replace your motor.
Click here to view Central Vacuum Motors
Click here to view How to replace a motor
If you do not hear a click, then you need to replace your relay.

e.o oddly i remember seeing an AC blower doing this outside of its system it seems to me the control box on the blower isnt really seeming to know what to do since its all controlled electrically and if its getting mixed inpulses then the control box itself can get confused on knowing what to do such as fan speed and controlling it to turn off and on....most likely the control box isnt working as it should and may need replacement or have an electrical guy check things out

Hello BWOOD Check the thermostat FAN button is in AUTO position not ON position.That might be it .The relay is in the blower unit but they RARELY become frozen/welded stuck on.

You need to call someone who truely knows what they're doing. From your decription, the person you had out should not be working on units. You have a problem most likely caused be the person that installed the new motor and these units are not designed to be worked on by the homeowner. There are hazards that could cause damage or injury.

The thermostat is the controller.

First check the breakers for the condensing unit (outside unit) and the disconect outside by the unit (could be a breaker ,a pull off/on switch or fuses)If its ok , you should have 220 ,240 volts to the unit contactor (you'll see it after removing the cover on the condensing unit).When the termostat is in the cold position and the temperature its set is lower than the one inside the house the contactor should be pulled in and give power to the compresor and the fan.But if the termostat is in the cooldest set and the blower inside the house works and the contactor in the condensing unit is not pull in the problem is in the termostat or in the low voltage wire.

On my computer screen these two problems are not the same.

To "garys2003" Clicking you hear is the contactor closing in calling for cooling. If no power is being supplied to the outside unit high voltage the unit will not run. Check your circuit breaker or fuses in the outside power box. If the outside power box is of the non-fused disconnect, check that the disconnect is inserted properly.

To Trenina: Is your unit a self contained unit outside ducted to the inside as with a Mobile Home. If so your evaporator cooling coil may be frozen over stopping air movement, turn the cooling off and set your fan to on until it defrosts, then return to normal operation and leave the fan on during cooling.

If nothing comes on inside as with a central A/C system you may have a problem with the blower motor itself.