Magnetic switch on outside unit does not activate - when I depress and hold in relay fan and compressor operate and cool house
Hi, this relay is your contactor that you are pushing in to make it run. You are not getting 24 volts to the 2 small wires that terminate on the side of this contactor. These 2 wires are low voltage and are controlled from the thermostat and indoor unit. You either have a faulty thermostat, or you may have blown the fuse on the indoor unit, if yours has one. Remove the panel on the indoor unit to see if you have a circuit board.See if you have a fuse that is just like a automotive plug in fuse that's plugged into the board. See if it is blown. If not, is the indoor unit running, its just the outdoor unit that will not come on? If the indoor unit comes on and runs, but the outdoor unit does not come on, you more then likely have a time delay relay that is mounted on the outdoor unit that is faulty and will not send 24 volts to the delay.It has failed, and that is why it will only start when you push the contacts down on the contactor. Some are a small black square box with 2 to 3 wires on them, and some are a small square circuit board that will have T-1, T-2, and the box type will have like a timer on the face. They can be bypassed, as I have done this many times to get people cooling, but you need to no what wires to remove and terminate to the contactor coil. The large wires going into this contactor you are pushing down, are very high voltage, so I wouldn't recommend doing this, as you will get shocked and this is not solving your problem, but I am glad you have told me what is going on, it has helped very much. If your indoor unit comes on with the thermostat, I am sure the stat is good, but your delay relay has failed not letting the contactor to energize by its self. You would need to find out which 2 wires on this delay relay to move to the contator coil. You would need a meter to check to see which ones to use. You can do this. Turn off the breaker to the complete unit, both indoor and outdoor. The 2- small wires that are coming from inside your house that run along the copper pipes are the 2 you need to use. If you do have a time delay relay, these 2 wires will go into the control area, and wire up to 2 other wires that plug into this relay. What you can do, is take these 2 wires coming from the house, probably red and white, and what you need to do is the contactor that you have been pushing down will have a brown and blue small wires hooked on each lower side of it. This is the 24 volt coil. The 2 wires have 2 female connectors on the ends of them.Leave them plugged into the coil if you have enough to work with, and cut one at a time and take the 2 from the house and hook one to one side and one to the other side, tape them up, and you are done!so, all you are really doing is taking the 2 wires coming outside that start the unit, bypassing the bad time delay and hooking them up right to each side of the contactor coil you are pushing down. Very simple, just take your time, and follow my steps. Let me know how you have done. This will save you lots of $$$$. Now, you are activating the coil like it should be, with out the bad time delay, as you will not need it because your thermostat also has a delay. Please let me know the out come.
A/C, & Heating Contractor.
Jun 10, 2011 |