Question about Heating & Cooling
I AM LOST IT KEEPS BLOWING MY FUSES
Generally the 24VAC terminals are marked on the furnace board. If it is blowing fuses, check for a short circuit in the thermostat wiring. I have found that the short is usually at the condenser unit where the insulation deteriorated. Many times caused by a dog or cat chewing on the wire. To test, remove the thermostat connections at the control board and power up to see if fuse blows. If it doesn't, you found your problem. Good luck.
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Posted on Jan 02, 2017
SOURCE: Wiring a thermostat.
The green one is for the evaporator fan motor relay. The white one is for the heat sequencer. The one coming out of the transformer is usually red BUT it will be the power so attach it to the terminal labeled R on the thermostat. If there is a RH and a RC, put a jumper in between them. See if the purple and brown ones go to the fan motor, if so, then just cap them off with wire nuts, and that should have your heat working. Check to make sure the green and white wires go to their designated areas (the heat sequencer looks like a stacked set of thermal overload switches and the relay looks like, well, a relay) and neither ground out before flipping on power or you will pop your transformer.
Posted on Jan 28, 2008
99% of the time proves to be a short- in the thermostat, furnace, condenser, or the 24V wires between them. Time to get out an ohm meter and check continuity between the wires and between each wire and ground - detective work - can be fun!?
Much less likely: condenser contactor, furnace control board, other condenser controls any of which could be drawing too much current. I bet on a short curcuit but if not I'd try changing the contactor first I think.
Posted on May 06, 2009
There should be a small set of screw lugs on the electronic board in the furnace. Look for a red wire that comes out of the transformer and follow it to find where the 24V connections are.
Posted on Sep 26, 2009
First thing I would recommend is to go to the closest auto parts store and get an inline car fuse folder and some 5 amp fuses. Connect this to wire that comes off the transformer and goes to R. That way you will only blow fuses instead of transformers.
I will assume this system isn't a heat pump since it runs fine in heat mode. If it is, please let me know. Also, I will assume there is no circuit board outside, but let me know if there's one.
Go out to the condenser and remove the Y wire from the contactor, then try the system in cool mode. If the fuse blows, you have a short in the low voltage wire between the air handler and condenser and will need to find it, cut it out, then re-splice. If the fuse doesn't blow, you will likely need a new contactor.
Posted on Mar 23, 2010
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