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Brian H
Brian H, Master Electrician
Category: Electrical
Satisfied Customers: 9
Experience:  Master Electrician / State Certified
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I installed my thermostat Honeywell rtc2401b And my AC IS

Customer Question

Hello
I installed my thermostat Honeywell rtc2401b
And my AC IS NOT TURNING ON
Submitted: 1 year ago.
Category: Electrical
Expert:  Brian H replied 1 year ago.

Hello my name is ***** ***** I'll be assisting you today.

I assume you were replacing a thermostat. How many wires and what color were going to the old stat?

Customer: replied 1 year ago.
G - green
C - blue
R - red
W- white
Y yellow
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 1 year ago.
Please respond
Customer: replied 1 year ago.
Can we continue thru text
Expert:  Brian H replied 1 year ago.

Yes, the following are the connections that should be made on the back of the new stat.

  1. Green - G (fan)
  2. Blue - C (common)
  3. Red - R (hot)
  4. White -W (heat)
  5. Yellow - Y (cool)
Expert:  Brian H replied 1 year ago.

Is the battery installed in the back of the thermostat?

It won't function properly without it.

Customer: replied 1 year ago.
battery is connect display is good . Fan is not turning on , where do I connect the blue wire to ?
Expert:  Brian H replied 1 year ago.

The blue wire is the "common" wire coming from the transformer. It is not needed on this thermostat.

Expert:  Brian H replied 1 year ago.

When you disconnected the old thermostat did you note which color wire was going to which "letter" on the back?

Customer: replied 1 year ago.
Ok so I can just use electrical tape and cover it .. All other wired are connect .. Display is good it turns on ... Yes we used letters and colors stickers ..
Customer: replied 1 year ago.
We are trying to set it .. But the fan doesn't turn on --
Expert:  Brian H replied 1 year ago.

The left switch on the bottom should be in the 'cool' position and the right switch should be in 'auto'. Use the up and down buttons on the front to lower the temperature setting to 65 for testing purposes.

It should then say "cooling on" below the displayed temperature.

If that doesn't work try switching the right fan switch to "on"

Customer: replied 1 year ago.
did all that .. Cooling on started blinking on and off -- but the AC doesn't turn on -- appreciate your help --ok rewired not using the blue ...
Cool button is on
Fan is on auto
Expert:  Brian H replied 1 year ago.

If the cooling on is blinking:

This feature helps prevent damage to the compressor in your air conditioning or heat pump system. Damage can occur if the compressor is restarted too soon after shutdown. This feature forces the compressor to wait 5 minutes before restarting. During the wait time, the display will flash the message Cool On (or Heat On if you have a heat pump). When the safe wait time has elapsed, the message stops flashing and the compressor turns on.

Customer: replied 1 year ago.
Ok cooling on is not flashing ...
How do I reset the thermostat ?
Expert:  Brian H replied 1 year ago.

Remove the face of the thermostat and remove both batteries

Customer: replied 1 year ago.
Ok did that ...
Customer: replied 1 year ago.
Could it be my unit outside is not working ??
Expert:  Brian H replied 1 year ago.

When was the last time the AC was on and working?

A few other things you could check:

  • Verify that none of the wires came loose or broke off the back of the new stat.
  • Check the outside unit, make sure the disconnect switch is closed
  • Check the circuit breaker feeding the outside AC unit
  • If all that checks out a way to make sure it's not a problem with the new stat is to disconnect the wires from the back and twist the RED, GREEN, and YELLOW wires together. This will simulate the thermostat turning the AC on. If that doesn't work these would seem to be an issue with the furnace or the outside unit.
Expert:  Brian H replied 1 year ago.

I hope those suggestions will solve the problem.

If you have anymore questions feel free to ask, otherwise please remember to rate my service before you log off.

Have a great evening.

Brian..............

Customer: replied 1 year ago.
Ok so once I twist all three together .. Then I untwist them and put them in correct slots ?
Expert:  Brian H replied 1 year ago.

Yes

Expert:  Brian H replied 1 year ago.

Hi just checking in to see if the AC is working now.

Brian...

Customer: replied 1 year ago.
No AC is still not working
Cooling is on -- lights on unit is on
Wires are correctly inserted new batteries .. And still no air .. The unit outside doesn't Spin also
Expert:  Brian H replied 1 year ago.

What happened when you connected red, green, & yellow together?

Customer: replied 1 year ago.
Nothing happened ...
Of course power was turned off ...
I live in Lancaster ca and it's 105
Expert:  Brian H replied 1 year ago.

After the wires were twisted together the power should have been turned back on.