Screwed Up Nest Wiring
#1
09-05-17, 06:48 PM
Screwed Up Nest Wiring
So some idiot installed my nest wrong(me). And I've since thrown away the previous honeywell thermostat. I installed the nest in June and the fan and air conditioning have both worked great since installation but I have no heat. I fiddled with the wiring per the nest diagram but really have no idea what I'm doing wrong or how to fix it. When I set the nest to turn on heat, the fan blows but NO heat at all. Im including pictures of the nest wiring and the wiring inside the air handler. It is a Rheem classic series. It is an older unit so I guess its possible that something else has gone wrong with the Rheem unit since I installed the Nest. Any suggestions would be extremely helpful.
#2
09-05-17, 07:13 PM
Group Moderator
Welcome to the forums.
These wires look normal..... just confirm on the stat ....
W1 = white
R = red
G = green
C = black
Y1 = yellow.
I see some possible problems at the air handler. You didn't mention changing the wires there. I need to see the screw connectors inside the red circle. Do you have a split A/C system with electric re-heat or do you have a heat pump system with electric re-heat ?
I need to see wire on circled connection block.
These wires look normal..... just confirm on the stat ....
W1 = white
R = red
G = green
C = black
Y1 = yellow.
I see some possible problems at the air handler. You didn't mention changing the wires there. I need to see the screw connectors inside the red circle. Do you have a split A/C system with electric re-heat or do you have a heat pump system with electric re-heat ?
I need to see wire on circled connection block.
#3
09-05-17, 07:52 PM
These wires look normal..... just confirm on the stat ....
W1 = white
R = red
G = green
C = black(This is actually brown black was not hooked up on previous thermostat so it is not hooked up now)
Y1 = yellow.
The others are confirmed correct.
I see some possible problems at the air handler. You didn't mention changing the wires there. No wires changed here but I thought it may give insight to the problem. I need to see the screw connectors inside the red circle. Do you have a split A/C system with electric re-heat or do you have a heat pump system with electric re-heat I know the is terrible but im not sure I think its a heat pump but not sure how to tell but can investigate if needed?
I need to see wire on circled connection block. Picture Attached.
W1 = white
R = red
G = green
C = black(This is actually brown black was not hooked up on previous thermostat so it is not hooked up now)
Y1 = yellow.
The others are confirmed correct.
I see some possible problems at the air handler. You didn't mention changing the wires there. No wires changed here but I thought it may give insight to the problem. I need to see the screw connectors inside the red circle. Do you have a split A/C system with electric re-heat or do you have a heat pump system with electric re-heat I know the is terrible but im not sure I think its a heat pump but not sure how to tell but can investigate if needed?
I need to see wire on circled connection block. Picture Attached.
#4
09-05-17, 08:11 PM
Further Info
Just to be clear there are Blue, Black, Pink, and Orange wires at the thermostat that are not hooked up. It was advised that I should take a picture of the original thermostat connections but it seemed so simple to do at the time 
hindsight is 20/20
hindsight is 20/20
#5
09-05-17, 08:55 PM
Group Moderator
Ok...pics are good but can't quite see the letters. Just fill them in for me.
blue = B
brown = ?
red = ?
I'm leaning towards a heat pump. If I'm correct...there needs to be a change at the nest.
If it was a heat pump system.... the outside condensor unit would run in the winter.
blue = B
brown = ?
red = ?
I'm leaning towards a heat pump. If I'm correct...there needs to be a change at the nest.
If it was a heat pump system.... the outside condensor unit would run in the winter.
#6
09-06-17, 05:52 AM
From the board's part number the terminals are B, ODD, C, R - https://www.repairclinic.com/PartDet...434002/2638596
So at the Nest the Blue should go to the O/B terminal and then tell Nest that it is a B
https://nest.com/support/article/My-...-to-be-heating
Also - the white makes more sense to go to the W2/AUX terminal as it is for the auxiliary heat strips.
So at the Nest the Blue should go to the O/B terminal and then tell Nest that it is a B
https://nest.com/support/article/My-...-to-be-heating
Also - the white makes more sense to go to the W2/AUX terminal as it is for the auxiliary heat strips.
#7
09-06-17, 11:26 AM
Group Moderator
Since the brown wire is connected to C at the air handler... make use of it at the stat.
W2/AUX = white
R = red
G = green
C = brown
Y1 = yellow
O/B = blue
W2/AUX = white
R = red
G = green
C = brown
Y1 = yellow
O/B = blue
