I just recently replaced my RUDD thermostat with a new Honeywell RTH7400. My problem is the heat is not working. I'm not sure if the wiring is connected correctly.

Here's what I have :
C- blue
G- green
Y- yellow
W- white
RC- red
W2- black
Y2- brown

Can anybody help?

I just recently replaced my RUDD thermostat with a new Honeywell RTH7400. My problem is the heat is not working. I'm not sure if the wiring is connected correctly.

Here's what I have :
C- blue
G- green
Y- yellow
W- white
RC- red
W2- black
Y2- brown

Can anybody help?

Try this site: Thermostat wiring colors and furnace terminal designations repair. (http://www.toad.net/~jsmeenen/wiring.html)

This may help too. https://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-faq-northerheat-58313.html

I just recently replaced my RUDD thermostat with a new Honeywell RTH7400. My problem is the heat is not working. I'm not sure if the wiring is connected correctly.

Here's what I have :
C- blue
G- green
Y- yellow
W- white
RC- red
W2- black
Y2- brown

Can anybody help?


Two wires, hook it up...
Three wires, f**k it up...
Four wires... give it up!

I see white as being for Heat most often.
If that doesn't work, A Tech might open Air Handler and see where the connection for heat is, may be a W. or follow back from Heat Strip to a Contactor or Relay. The white would connect to the Contactors 24 volt coil.

That is the most common, white is 24 v to start the heat.

Ballenger, Excellent link, I Noticed no activity from NorthernHeat for over a year. Hope He/She is OK.

Northernheat and MOWERMAN 2438 both disappeared, wonder if they are together. LOL Northerns info was so great he/she is really missed but we are lucky to still have those links.

You Take Care.