Wyze Thermostat Install error - Extra wire

I am watching this… Having the EXACT same issue

Me too, identical situation as OP, except I am using his original dumb thermostat that has jumpers in the same places; mine looks identical. 15 year old Trane heat pump, living in Florida. I am an HVAC controls engineer with 20 years experience. I wonder if we know each other.

I am reading 27 vac between Rc and C. What exactly do you mean by switching that wire in for the common on the furnace and in the wyze? I only follow exact instructions; that way the manufacturer cannot blame me and void the warranty.

Also, I want to point out that the extra wires message appears without the wyze thermostat even wired up anymore. App seems to be telling lies.

Apologies if I am hijacking OP’s thread!

He has a blue wire with missing insulation, and all of his wires have insulation that appears to be cracking. he also has a black wire that appears to not be connected to anything, so my thought process was that he could try swapping that wire on both ends for the blue wire to eliminate any possible issues with the blue wire. If your only issue is that the wyze thinks extra wires are hooked up, then you can skip past that part if you press try again a couple of times. There might be some interference from the other wires confusing the wyze’s wire detection program.

Knowing that we are having the EXACT same issue, I would doubt that it is wire insulation. I tried MULTIPLE times to get past it by pressing the “try again” button but to no avail.

Wake Up Be Happy

Thanks for replying! The app was not letting me get past the “extra wires” screen no matter how many times I pressed try again. We both have an extra black and an extra brown wire not connected at the thermostat, if you have more ideas.

I am getting a steady 26.8v between C and Rc.
I don’t believe there is a problem with the wiring, as both of my old thermostats work fine.

The insulation is fine, the cracks you see are only at the end of the wires and were caused by using the rough needle nose plyers to get the wires into their spots. As I mentioned, I scraped the side of the blue wire trying to straighten it and have since wrapped that small part of the wire with electrical tape.

The app would also not allow me past the Extra Wires error no matter how many times I tried. As stated, I was able to exit the app, re-open it, then see the Wyze thermostat and attempt to use it. When turning the system to Cool or Heat, it would let me select a temperature, then a few seconds later it would change to OFF, even if I enabled hold. The actual HVAC system would never turn on in any way.

One thing I do notice is a ton of similarities between Destro’s situation, and mine:
We both live in Florida.
We both have 15 year old systems manufactured by American Standard (Trane is made by American Standard).
We both have the same original thermostat, wired the same way.
We both now have the same problem with the WYZE thermostat.

It sounds to me like there is some kind of compatibility problem with the WYZE thermostat and our type of system. What surprises me, is that our systems are very simple heat pumps, very common models, and made by one of the biggest HVAC manufacturers. I don’t see anything complex about our setups that should bother any thermostat. Newer HVAC systems are much more complex with more stages and features than ever before. I would think WYZE should work with the basic systems if it can be trusted to control more complex systems.

It looks like others are having the same problem.
I wonder if they have similar HVAC systems? :thinking:

I have a simular setup, same exact thermostat, I also got the extra wire message, and was able to skip and go into testing. It worked for me without any other issues, Also inside the app setup make sure you let it know you have an R wire, Not RC or RH. Your original thermostat was R.

What were the steps you used to skip this warning?

When you click try again, another tab pops up, and lets you click continue.

This was thermostat, I was replacing. My original “Dumb Thermostat” was the same as op as well…

I wonder if OP has a weird setup in the air handler. Maybe there’s some company that put a lot of them in weirdly in Florida around 2005…

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Not on mine, nothing would let me continue.
I am using Android, you?

Mine was installed by Action Heating and Air in St. Augustine, FL…
You live in this area Destro?

That is pretty funny that we both went from the same original dumb thermostat, to the same smart radio thermostat, to the Wyze thermostat, what are the odds? Still couldn’t get mine to skip the error using my Android phone though.

Android as well. I wish I took a screenshot of it.

I ALSO have a Trane system and ALSO have two extra wires that are just wrapped and not used. ( black and brown )
There must be something to this …

Wake Up Be Happy

Hey neighbor, I’m in Jacksonville. Thanks for linking to the other thread which suggested reinstalling the app. I am suspicious that might be the fix since the app keeps telling me about extra wires even though it’s not wired up. Wondering if there is a step being skipped to finalize the configuration of the thermostat to get it to work correctly, and we can’t get though the wiring check to hit that step.

I’ve already invested more time than I expected this evening, so I will give reinstalling the app (and the wyze thermostat) another night.

Same here. Whoever gets back to theirs first, report results!

Success! Well, mostly. Still working on confirming it’s got heat/cool configured correctly, since those were backwards in the test. But after reinstalling the app, I opened the thermostat in the app and it started to show me the “Welcome home” screen, but popped up with an update for the thermostat to install, which I did. Afterwards, the app eventually brought me back to the home screen. To check, I removed the thermostat from the app and re-added. This time, when the “extra wires” screen showed, I was given a pop up to skip or try again. I skipped and the app asked me a few more questions before taking me to the “welcome home” screen.

I ran the system test, but it had the heating and cooling backwards, and turned the fan off during what it called heat stage 2 (which should be my electric / emergency heat). I am alarmed that it may be turning on my electric heat strip without the fan running (which could cause a fire, if safety devices are not installed and working properly). I see there is a setting under “settings / advanced” to swap heat and cool, which I had to uncheck to get it to work correctly, but I’m not sure if it’s smart enough to know what to do with my electric heat.

I will not hijack this thread with these issues, but know that reinstalling the app seems to have worked, but I’m not out-of-the-woods yet.

I tried to install mine yesterday and has similar issue. I don’t have any wires in those ports where it said I have extra wires. I uninstalled the app and also reset the thermostat by holding the knob down several times and still same issue. Also updated the firmware.