What Does It Mean When Your Honeywell Thermostat Says “AC Power Loss”?

Alex Ortiz
By Alex Ortiz 18 Min Read
18 Min Read
what does it mean when your honeywell thermostat says ac power loss featured

Hey there, reader! Have you ever seen the “AC Power Loss” message on your Honeywell thermostat and wondered what it means? Don’t worry; I’m here to help you figure it out.

So, this “AC Power Loss” thing pops up on your thermostat. What’s it all about? Well, simply put, it’s like your thermostat’s way of saying, “Hey, I think one of the air conditioners isn’t getting power!”

But that’s not the only reason. Sometimes, it could also mean there’s an issue with the thermostat itself or with parts of your heating, ventilation, and air conditioning (that’s what HVAC stands for) system, like the furnace or breaker.

Let’s chat a bit more about this message on your thermostat. Imagine your thermostat as a little detective. When it shows the “AC Power Loss” message, it’s trying to tell you there’s a mystery to solve. Maybe one of the air conditioners isn’t connected to power anymore. Or perhaps the thermostat itself is having a bad day, or there’s a hiccup with the furnace or breaker.

Don’t fret! I’ve got some easy steps for you to follow. Stay with me, and by the end of our chat, you’ll have a clearer idea of what’s going on and how to fix it.

Remember, always speak in English when discussing these issues. It makes things easier for everyone.

What Does AC Power Loss Mean On Thermostat?

Has your thermostat been flashing “AC Power Loss” and left you scratching your head? No worries! Let’s break it down together.

Imagine you’ve got a toy that needs batteries to work. If the batteries are weak or not properly placed, the toy might not work, right? Similarly, when a thermostat says “AC Power Loss,” it’s kind of like it’s telling you, “Hey, I’m not getting the power I need!”

So if there’s a hiccup in the electricity coming to your air conditioner (AC), your thermostat is like a helpful friend that lets you know something’s off.

You know Honeywell thermostats? They’re kind of special. On their display, if they show “AC Power Loss,” it means one of the AC units connected to it isn’t getting the power juice it needs. Think of it as your thermostat’s way of shouting, “Help! One of the ACs isn’t feeling too good!”

And when you see this, it’s like getting a little nudge to check things out quickly. Because sorting it out sooner can help prevent bigger electricity problems.

Wondering why this might be happening? Here are some common reasons:

  1. The AC’s Power Plug Might Be Acting Up: Just like how sometimes our phone chargers don’t work, the AC’s power plug can have issues too.
  2. Brief Power Glitch: Sometimes, there’s a quick power cut, and that can cause the message.
  3. Some AC Power Trouble: One of your AC units might not be working right.
  4. Your AC’s Feeling Thirsty: Sometimes, the AC can’t get all the power it needs.
  5. Issues with the Bigger HVAC System: Sometimes, the overall heating and cooling system might be the reason.

And hey, just a little side note: On rare occasions, the problem might be with the thermostat itself or maybe the way the wires are connected. But we can chat more about that later!

Always remember to discuss these things in English. It just makes understanding everything a tad bit easier!

Honeywell Thermostat Says AC Power Loss – Quick Solutions!

Your Honeywell thermostat says “AC Power Loss,” and we’re going to tackle this together. Just a little heads up before we start: to get the best results, it’s a good idea to try these steps one by one. And make sure your thermostat is turned on when you do this.

Ready? Let’s dive in!

1. Thoroughly Examine the AC Unit

Alright, first things first! The message is telling us there might be something up with the AC’s power. So let’s start by checking the AC unit itself. If you’ve got one of those big fancy systems with more than one AC, bear with me – it might take a little longer, but we’ve got this!

We’re mainly going to look at how the power’s getting to your AC. Think of it like checking if your phone’s charging properly.

Sometimes, the “AC Power Loss” message can pop up right after your AC stops working because something’s gone wonky with its power.

Here’s what to do:

  1. Make Sure It’s Plugged In: This might sound super basic, but hey, it’s always good to check. Is your AC plugged into its socket?
  2. Inspect the Power Cord: Check out the AC’s power cord. Does it look okay? No weird bends or breaks?
  3. Give It a Reconnect: Unplug the AC’s power cord and then plug it back in. Kinda like giving it a little power nap.
  4. Any “Low Power Mode” On?: Some ACs have this “Low Power Mode”. Make sure it’s not turned on by mistake.

A quick heads-up: If you’ve got this “Low Power” setting on your thermostat, sometimes it can trick the system into thinking it’s not getting enough juice. So, it might be a good idea to check that out and turn it off if it’s on!

2. Inspect the Thermostat’s Wiring

Alright, onto our next step! Sometimes the message you’re seeing can be because of some sneaky wiring issues. Let’s dive deep and check those wires to make sure they’re all cozy and connected right.

Your thermostat is a bit like a puzzle, with wires connecting in certain ways to make the whole thing work smoothly. Let’s uncover that puzzle:

  1. Gently Remove Your Thermostat: Take your Honeywell thermostat off its wall stand. Be gentle; we don’t want to break anything!
  2. Peek Inside: Now, gently pull out all the cables you see inside the wall behind it.

Okay, so inside that wall, there are two groups of cables connected to your Honeywell thermostat:

  • Half connect to the AC Unit.
  • The other half link up to the Furnace Unit.

Here’s a simple breakdown:

Furnace Connections Air Conditioner Connections
“Rн” (red wire) connects to “R” “G” (green wire) connects to “G”
“Rc” (also a red wire) connects to “R” “Y1” (yellow wire) connects to “Y1”
“W1” (gray wire) connects to “W1” Optional wires: “PEK” and “OB”

And hey, a cool thing about your thermostat? All those little ports and places where the wires go are labeled. So, it’s like connecting the dots!

How to Hook Up Those Wires Right

  1. Connect the red “Rн” wire from the furnace to the “R” spot in the furnace connections.
  2. Link the gray “W1” wire from the furnace to the “W1” spot there too.
  3. The red “RC” wire from the furnace? That goes to the “R” spot on the supply unit.
  4. Now, the AC wires. The green “G” wire goes to the “G” spot on the fan relay connector.
  5. And the yellow “Y1” wire? It connects to the “Y1” on the compressor’s first stage.

One Last Thing! If you’re setting this up for the first time or feel unsure, it’s always a good idea to call in the pros. They’ve got the know-how and can make sure everything’s set up perfectly.

3. Connect your AC to a Different Outlet

Okay, next up on our list: checking out the outlet. Sometimes the outlet where your AC is plugged in might be the culprit. Think of it like your AC’s favorite coffee shop running out of coffee. Let’s find another place for your AC to get its power!

Switching Your AC’s Spot

If your thermostat is giving that error, it might be hinting that your AC’s current outlet isn’t providing any power. Solution? Time to find a new spot for your AC!

  1. Switch It Up: Unplug your AC from its current spot and move it to another outlet that you know for sure is working.

How Do You Know If An Outlet’s Working?

Want a super easy way to check? Use your phone and its charger!

  1. Plug and Play: Grab your phone charger and plug it into the outlet. Now, connect your phone.
  2. Check the Charge: If your phone starts charging up and you see that battery icon filling, bingo! The outlet’s good to go.

One More Tip! When testing, it’s a good idea to pick an outlet in a different room. That way, you’re checking an outlet that’s likely on a different circuit. This just gives an extra layer of certainty.

4. Power Cycle the Honeywell Thermostat

Alright, so the last few steps didn’t do the trick? No worries! Let’s try giving your Honeywell thermostat a little reboot. Think of it like when your phone acts a bit weird and you turn it off and on again. It’s the same idea, but with your thermostat.

A “power cycle” is just a fancy way of saying “turn it off and then turn it on again.” Since your thermostat runs on batteries, we can reset any temporary glitches by taking out the batteries for a bit.

Here’s How to Do It:

  1. Turn It Off: Switch off your Honeywell thermostat.
  2. Off the Wall: Gently remove the thermostat from its wall stand.
  3. Battery Time: Now, find the screws that keep the battery compartment closed and open it up.
  4. Battery Break: Take out the batteries and give them (and the thermostat) a short break.
  5. Wait a Bit: Count to 40 (or maybe sing a bit of your favorite song to pass the time).
  6. Batteries Back In: After the short wait, put the batteries back in.

Quick Warning! When you put the batteries back, make sure you put them in the right way. If you switch the positive and negative ends by accident, your thermostat will reset. But if that happens, don’t stress, we can walk through how to set it up again (check solution #7 for that).

5. Toggle the Safety Switch

Moving right along! Let’s now focus on a little thing called the safety switch. This switch is like the big red button for your HVAC system, helping you control it during emergencies.

The safety switch is like a superhero feature for your HVAC system. It can pause the system for a bit, especially if there’s an emergency like a flood or a major system hiccup.

How to Use the Safety Switch:

  1. Find the Switch: Head over to your furnace room and look for the safety switch.
  2. Give It a Quick Toggle: Once you find it, flip or toggle that switch and hold it for 15 seconds.
  3. Switch It Off: After those 15 seconds, make sure you move the safety switch back to the “OFF” position.

A Side Note: If you’re curious about why your Honeywell thermostat’s heat might not be working on auto, there’s more to read on that. But for now, let’s focus on getting that “AC Power Loss” message sorted!

6. Check the Fuse/Circuit Breaker

Next on our checklist is to take a look at the fuse and circuit breaker. These are like the heart and brain of your home’s power system, making sure everything’s running smoothly.

Your thermostat and HVAC system need power to run. If something’s gone a bit wonky with the fuse or if the circuit breaker tripped, it’s like someone turned off the power tap to them. And that could be why your thermostat is saying “AC Power Loss.”

How to Give the Circuit Breaker a Quick Reset:

  1. Locate the Panel: First, head over to your circuit breaker panel.
  2. Find the Right Fuse: Look for a fuse labeled “Thermostat” or “HVAC.”
  3. Do a Little Reset: Once you’ve found it, push the lever down and count to 10. This gives it a quick reset.

Sometimes, if there’s been a power issue, the fuse can blow. Here’s how to check:

  1. Back to the Panel: In that same circuit breaker panel, look for the fuse labeled “HVAC” or “Thermostat” again.
  2. Inspect the Fuse: Check the top part of the fuse. If it looks like it’s popped open or it’s turned black, that’s a sign it’s blown.

Quick Note: If you find a blown fuse, don’t worry. Just unscrew it from the circuit breaker. Take it with you to a hardware or tech store, and they’ll help you find the right replacement.

7. Factory Reset the Honeywell Thermostat

Alright, friend, if everything else hasn’t quite done the trick, it might be time for a fresh start with your Honeywell thermostat. It’s kind of like when your phone acts up, and sometimes you just need to reset everything to factory settings. Let’s dive into how to do this!

This step might help clear that “AC Power Loss” message for good. But a heads-up: doing a factory reset means any special settings you’ve set up on your thermostat will be wiped clean. It’s like giving it a fresh start!

Step-by-Step: How to Reset Your Honeywell Thermostat

  1. Off the Wall: Gently take your Honeywell thermostat off its spot on the wall.
  2. Battery Peek: Open up the battery compartment. You should see the batteries in there.
  3. Battery Swap: Take out those batteries.
  4. Flip Them: Now, here’s the trick. Put the batteries back in, but the wrong way around. So, the “+” end goes where the “–” should be, and vice versa.
  5. Wait a Moment: Count to 20. This gives your thermostat a moment to reset.
  6. Flip Them Back: After the wait, take out the batteries and put them back the right way: “+” to “+” and “–” to “–”.

One Last Thing: Once you’ve done the reset, your thermostat might take a little nap. It could be about 3 minutes before it wakes up and starts up again. Just like when we wake up from a nap, it needs a moment to get going!

In Conclusion To

Tackling the “AC Power Loss” message on a Honeywell thermostat might seem daunting at first, but with the right steps, it can be resolved. From resetting the circuit breaker to giving the thermostat a fresh start with a factory reset, each solution brings you closer to a fully functional system.

Always remember to approach each step with care and patience, and soon, your thermostat will be back in tip-top shape, ensuring your home remains comfortable and cozy.

Remember, technology might have its hiccups, but there’s almost always a solution within reach!

Share This Article
Leave a comment

Leave a Reply

Your email address will not be published. Required fields are marked *