A/C THermostat wiring: 4 wires, R, Blue, Gr, Wh..?
Question:The fan works, but not blowing cold air...could it be the blue wire?I've seen some say it should attach to Y screw?
Answers:
blue generally is the wire controlling the
a/c. attach it to y. It should work.
Red-hot. White-heat. Green-fan. Blue or Yellow-cool.
blue must go to ac contactor. red, transformer, green, indoor fan, and white, heat.the blue wire should be yellow typically. yellow/blue to a/c contactor.
um see what color wire connects the outside contactor maybe.
BUT if your outside fan is coming on and you arent blowing cold, may wanna check the pressues and see if you have a refrigerent leak or other prob. replace inside filter and clean condensor coil too.
of course wires could be spliced together too. is the outside fan coming on on a call for cool? i doubt if your issues are wiring. check the outside fan. you know you can push the contactor in manually right? (its a 220 circuit so if you dont know leave it alone! you could sit there and fry!) insulated screw driver? that will give you a lot more insight. oh and check the overloads on comp, although thats not it..
colud be a bad evap, or a leaky one. hope not. if it is, you can still recharge and MAYBE get through a summer.
shoot, could be a relay. see if outside fan is coming on. as well as compresor and check capacitors too! a multi meter helps here. A LOT! GL with it!
here is basic connections on thermostat and how wires should connect to it.red is hot line from transformer goes to r terminal , green is fan goes to g terminal white is heat goes to w or w1 terminal... if blue is being used for cooling but this wire should always be yellow goes to y terminal at thermostat. blue is suppose to be common wire from transformer.is outside unit on and compressor running yes or no..if yes then low freon ...if no 8 reasons it might not be working.. 1 bad contactor on outside unit..2 bad capacitor especially if it is a duel capacitor ( fan and compressor both using one capacitor, will have three sets of terminals) 3 low freon switch has it locked out...4 high pressure switch has it locked out.5 breaker knocked..6 bad compressor...7 wire burnt off compressor terminals...8 low voltage
On your t-stat Rc and Rh should have a jumper then wire- R to R, W to W, Blue to Y, G to G. Make sure those wires match on your circuit board. Also on your circuit board you should have a two wire coming from your outdoor unit. R(wire) to Y(board) and W(wire) to C(board). If all wires are hooked up correctly you should be in business. Hope this helps and good luck.
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