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We are having issues setting up or new Nest Thermostat. The

Customer Question
wires our system has is: Rh...
We are having issues setting up or new Nest Thermostat. The wires our system has is:
Rh, W, C, G, Y/Y2 & O/B
When we hooked it up to new thermostat it said we couldn't have an O/B wire without Y1 but there wasn't a wire in the Y1 port when we first took it apart
Submitted: 11 months ago.Category: HVAC
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Answered in 1 minute by:
11/27/2016
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,765
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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hello,

My name is Billy.

Exactly what terminals were used in the old thermostat?

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Customer reply replied 11 months ago
Rh, W, C, G, Y/Y2 & O/B
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

Ok so on the Nest you will use yellow to Y1

Have you tried it in Y1 yet?

Then of course orange to O

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Customer reply replied 11 months ago
do we still use the Y/Y2 wire? When we tried that setup we weren't getting warm air only cold.
Customer reply replied 11 months ago
The color of the wire going into Y/Y2 is reddish brown and our yellow wire wasn't connected
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

Do you have Rheem or Ruud product outside?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

ok, I say yellow because that is color code...

BUT...whatever wire you had on Y in old thermostat goes to Y1 in Nest

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

If yellow was not attached in old thermostat, leave unattached and taped.

I ask because Rheem/Ruud use a different reverse valve O/B.

But we can tell soon.

So in old thermostat yellow was not attached and brown was in y/y2?

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Customer reply replied 11 months ago
the yellow and black wires were not connected
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

Ok so then you will put your brown in Y1 at Nest. Tell me if it recognizes it

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

Yep, That is correct.

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

does it heat now?

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Customer reply replied 11 months ago
Cold air is blowing out
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

Is the outdoor unit running?

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Customer reply replied 11 months ago
No
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

Thank you.

Do you know what equipment you have ?

Gas furnace with heat pump, heat pump only etc?

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Customer reply replied 11 months ago
I believe we have a furnace with heat pump but I can't find it in our manual to be sure
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

did you use a white wire on W/Aux?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

so no wire on w1?

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Customer reply replied 11 months ago
No, the white wire is in W1 not in W2/aux
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

move the white wire to W2/Aux

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Customer reply replied 11 months ago
Switched the wires. It is blowong cold air and unit isn't running outside
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

then it is important to know what equipment you have.

The thermostat works on dozens of types of systems but we have to let it know what that is.

Gas furnace, electric furnace, air handle, air handler with electric strip, heat pump, heat pump with aux, boiler, central air, etc...

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Customer reply replied 11 months ago
I have the model numbers for both units but cannot find any information about what they are online
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

what do you have for numbers?

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Customer reply replied 11 months ago
Outdoor unit: 24ABB336A003
Indoor Unit: 24ABB336A310
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

ok that is a regular ac not heat pump...the indoor unit is attached to a blower system, can you get number for that? And is this the only thermostat in the home?

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 11 months ago

remove wire from o/b

move white back to w1

see if it picks up as a furnace with ac.

A gas furnace generally has an exhaust pipe to the outside if that helps.

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Customer reply replied 11 months ago
It is a 58MCB deluxe 4 way multiplies fixed capacity condescending gas furnace
Customer reply replied 11 months ago
Switched the wires. Blowing cold air and outside unit not running
HVAC Technician: D.E. Anderson, Industrial Refrigeration Service Manager replied 11 months ago
D.E. Anderson
D.E. Anderson, Industrial Refrigeration Service Manager
Category: HVAC
Satisfied Customers: 198
Experience: 15 years experience. Design, install, service of residential & commercial hvac/r equip.
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Hi, do you still need assistance with this? Thanks

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Customer reply replied 11 months ago
Nope, figured it out.
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