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Ruud contour acheiver 90 plus trying to replace bad thermostat with Nest there is a black wire which goes to a "V" Not sure if this is also a power wire? the other wires are red to 24 V; blue to 24 C; Green to G; yellow to Y1;White to w Any help to connect to Nest second generation thermostat?

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Posted on Jan 02, 2017

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SOURCE: Manual Thermostat replcaement with Programmable Digital unit.

Hopefully there are markings on the old t-stat as to what terminal is what.
on the honeywell 8000 use the heat pump labeling and then the standard wiring would be
R- red
Y- yellow
B- O/B
C- black
G- green
There should not be a bare wire, it probably just has the insulation stripped back way too far.
You should probably open the furnace and compare the terminal label in the furnace to the wire color. normally yellow and blue pass through the furnace and are wire nutted to wires going to the outdoor unit. In the furnace the white wire will connect to the w or w1 terminal. also, you will need to set the Honeywell stat to have the following parameters.
other parameters that I did not specify, you may read the manual and make your own decision but I recommend factory settings for the other parameters

Posted on Jun 18, 2008

  • 2 Answers

SOURCE: I have a Ruud thermostat want to change to totaline p274-0200-c

new stat

Thanks for your help

Posted on Nov 25, 2008

  • 410 Answers

SOURCE: thermostat wiring goodman model aruf032-ooa-1b

is this a heat pump or straight cool with heat strips?

Posted on Mar 16, 2009

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SOURCE: wiring transformer

You have a "Multi-Tap" transformer, and should have a white label on it with wiring.

Posted on May 04, 2009

  • 4 Answers

SOURCE: replacing old thermostat with new digital

Wire nut or tape the black off. The red is normally 24volt supply power to the t-stat. Blue may or may not be the common. Have a voltmeter?

Posted on Jun 24, 2009

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New Nest thermostat, Model 2.8 Software version 4.0.1 keeps getting a low battery and shuts off and shuts down the furnace. Please help.

Do you have a common wire? The nest thermostat needs the common 24V C wire installed to keep the battery charged fully. Nest should tell consumers of this problem, but they don't. Its required for any powered thermostat. Even the new fancy Honeywells with touch screens etc..

Gotta realize the battery cannot run the display and wifi plus all the sensors for very long.

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My parents have a Ruud Acheiver central air unit coupled with the Acheiver furnace (not sure which model but approx 4 years old). Power went out for them after a storm on Monday. When power came back on...

If you held the contactors at the condensor in and the outdoor fan and compressor started, you have a control circuitry problem. The thermostat is more than likely wired incorrectly. The red wire at the t-stat is the 24VAC hot. If you touch it to the green wire the indoor fan should start. If you touch it to the wire that is going to the coil on the contactor you pushed in (color unknown as I am not there) it should fire the compressor and outdoor fan. Thermostats can be very tricky sometimes. Based on what you have written it is definitely a control voltage problem. If you do not have 24VAC you need to check the input power on the transformer and make sure you are getting 24VAC output.

Whatever you not take the red wire on the t stat and arbitrarily connect it to any other wires. One of those wires is the neutral side of the transformer and if you touch the hot red to it you will have a direct short and will need a new transformer.

If this has helped you please give me a rating I can be proud of. Thank you and best of luck.

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Sounds like it could be a dirty or bad flame sensor.
When the burner lights ,there is a flame sensor in the flame and it is suppose to sense the flame and send a signal back to the control board which will keep the gas valve open, if it gets dirty or is bad it doesn't send the signal back to the board and the board will shut the gas valve off and after three tries it will lock out the furnace and you have to reset it to get it to work again.
The flame sensor looks like a wire and it's in the flame usually it will get gas deposits on it, then it won't work.
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Look on the condensor, (outdoor unit) at the very bottom of the rear panel and you should find a red reset button. push it. If that does not solve the problem, and the outdoor unit is running (make sure both the fan AND the compressor are running) then you are looking at a low refridgerant issue and possibly dirty coils.

In that case, clean the coils and have refridgerant added.

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