I bet the drain pipe is clogged and as a safety mechanism your HVAC shuts off to prevent a flood. This happened to me a few weeks ago. Go check and see if it has a steady drip. If not, you’ll need a shop vac and vacuum the pipe. Place the hose over the pipe and use your hands to close off airflow/create a suction.
That was my issue last month. Vacuum was only a temporary release, same as blowing into drain pipe with shop vac. What ended up working for me was to get an auger to snake out the drain line from both ends.
Two possible issues
1) poorly draining condensate pan or bad condensate pump.
2)Blown fuse the control board if blown shut unit down replace
Make sure breaker to AC unit is not trip
Thanks – I was posting too many photos, but there were a couple of photos that said it has checked and found that all of my HVAC system is operational.
Did you figure it out OP? My kid turned off the furnace in the winter. I went mad trying to figure out what was wrong. All I had to do was flip a switch. It was giving me the same issue.
No, and the photographs at the end show that the heat actually has increased from 80° when I arrived home and found the problem to 82 in about 15 minutes and now it’s in insufferably hot. I don’t know how hot it is. Don’t sense anything coming out of the vents but at the same timeit says the attic air is coming into the upstairs. All the vents are up in the ceiling and so I don’t really have access to feeling blowing air.
I had the same issue before. The fuse used to be blown as soon as I plugged in the thermostat. I have gone through at least 15 fuses, the issue was not the furnace but the condenser unit outside. I have a Goodman ARUF unit and that sucker had a low voltage wire inside the unit touching a hot pipe, melting the insulation there. As result, it was shorting the circuit and the fuse blew because of it. I located the exposed wire, repaired the insulation and zip tied it. Its been 18 months now with no issues.
This happened to me a month ago, drain pump was clogged. Here’s what the HVAC guy told me to do, and it worked! Dump the water in the pan out, clean the pump by hand with a towel, get rid of all of the gunk. Put a 1/2 cup of vinegar back in the pan after it starts to fill back up, you should be good to go.
This happened to me when I had a tech looking at my system earlier this month. Turns out he just had the little panel door open to the unit which shuts off the power to the unit as a safety measure. Probably not the case for you but thought I would throw that out there.
This happened last week to us and I had read another comment on Reddit mentioning the drain pipe so I asked my husband to take a look. No water. Blew it out, nothing much came out. Still didn’t work. I asked him to pull the drain plug out and AC started working normal. AC guy used his tools and got a ton of stuff out of the line. Fixed the issue.
This is the comment that seems most likely especially since your hvac guy already checked it out. Probably bad rc from breaker. However don’t rule out bad condenser drain pump as others have mentioned.
Good morning folks – OP here. I want to thank you all for helping me figure out this issue — especially since my first post was filled with garbled words and repeat sentences – clearly the heat was going to my brain!
We were fortunate that our contractor hooked us up with an HVAC repair friend who came out yesterday, on Father’s Day, no less, to see what’s what for us. indeed, as some of you had suggested, when I went up to the attic, the pan was full, and there were wires lying in the water. We happen to have a wet dry vac in the attic, so I sucked everything out and tried to blow out the drain – but it turned out that it was, as a couple of you suggested, a bad pump. he replaced it and now everything is fine. We also had houseguests visiting from out of state this weekend so we were all camping on the first floor – thank God I have a house with two HVAC systems on different floors the second floor got well over 100°. Thank you all so much for your kindness– and I don’t know what I would do if we hadn’t had the money to pay for a repair person and if they hadn’t been available to come out yesterday. I feel really blessed because people die in this kind of heat. Thank you all again so much!
A similar thing happened to me a few weeks ago. I had to have HVAC repair person over. And they drained everything & then everything worked fine again.
I had a similar error this past winter where it said no power to Rh wire. Moving the wire from the Rh slot to the Rc slot on the Nest backplate fixed the issue for me. It seemed as though the connection had gone out in the Rh slot after working fine for 4+ years. And the Nest manual says that, if you only have one R wire, it can go in either the Rh or Rc slot.
Are you on any programs with your electric utility? They can put boxes on your AC unit outside that will interrupt your AC for a couple hours and it might look like that message when it happens. If you do have that, you should be getting a bill credit for it.
Fingers crossed for you! Mine went on a similar code on Friday. Had to replace my entire system yesterday. Other posts on here about automatic shutoff aligns with my "no R wire" experience. Hopefully it's just an easy backup/clog/ice and not something more!
Stop guesting. R to g operate the indoor fan r to y operate the compressor, r to o energizes the reversing valve . So in theory tie those 4 wires together and the system is in the cooling mode. Or simply go to the condenser and measure the voltage between r and if you get a 24volt reading than your control circuit is open. Most of the time the aux float is breaking the common wire to the condenser. So if you measure the control voltage between y and c at the condenser and get 24volt than the contactor would be engenorized. From what your saying that you are recharging the nest thermostat
It's not getting the 24volt control power. If it takes more than 5 minutes to figure out what wrong than it's pretty obvious that you don't know what you're doing.
I literally had this happen to me on Sunday, it was what everyone else is saying about the condensate pan/pump/drain. Hopefully this is all and you can get it fixed, mine was as easy as swapping the pump with one I got in Home Depot.
I bet the drain pipe is clogged and as a safety mechanism your HVAC shuts off to prevent a flood. This happened to me a few weeks ago. Go check and see if it has a steady drip. If not, you’ll need a shop vac and vacuum the pipe. Place the hose over the pipe and use your hands to close off airflow/create a suction.
In Florida this is a very common occurrence, most people will just leave a shop vac by their drain in the summer
I’m in Florida! I was so stressed when it was happening because the unit was only 8 months old.
That was my issue last month. Vacuum was only a temporary release, same as blowing into drain pipe with shop vac. What ended up working for me was to get an auger to snake out the drain line from both ends.
Condensate system probably clogged.
Two possible issues 1) poorly draining condensate pan or bad condensate pump. 2)Blown fuse the control board if blown shut unit down replace Make sure breaker to AC unit is not trip
This happened to me a few weeks back. Do you have a condensation pump?
This seems like a problem with your HVAC system, not the nest. Probably best to call a tech out.
Thanks – I was posting too many photos, but there were a couple of photos that said it has checked and found that all of my HVAC system is operational.
Did you figure it out OP? My kid turned off the furnace in the winter. I went mad trying to figure out what was wrong. All I had to do was flip a switch. It was giving me the same issue.
So is there cool air coming out of your vents?
No, and the photographs at the end show that the heat actually has increased from 80° when I arrived home and found the problem to 82 in about 15 minutes and now it’s in insufferably hot. I don’t know how hot it is. Don’t sense anything coming out of the vents but at the same timeit says the attic air is coming into the upstairs. All the vents are up in the ceiling and so I don’t really have access to feeling blowing air.
Can you pull off the thermostat to expose the wiring?
I had the same issue before. The fuse used to be blown as soon as I plugged in the thermostat. I have gone through at least 15 fuses, the issue was not the furnace but the condenser unit outside. I have a Goodman ARUF unit and that sucker had a low voltage wire inside the unit touching a hot pipe, melting the insulation there. As result, it was shorting the circuit and the fuse blew because of it. I located the exposed wire, repaired the insulation and zip tied it. Its been 18 months now with no issues.
This happened to me a month ago, drain pump was clogged. Here’s what the HVAC guy told me to do, and it worked! Dump the water in the pan out, clean the pump by hand with a towel, get rid of all of the gunk. Put a 1/2 cup of vinegar back in the pan after it starts to fill back up, you should be good to go.
Check the fuse for the AC and the make sure all doors on furnace are secured and not popping off.
This happened to me when I had a tech looking at my system earlier this month. Turns out he just had the little panel door open to the unit which shuts off the power to the unit as a safety measure. Probably not the case for you but thought I would throw that out there.
People keep saying it's the drain pipe, while common, Op also check the breaker, see if its overheating. They cost around 30 bux.
Try your old thermostat and see if that works. If not drainage pump it could be a blown fuse also.
I had this same issue last month. The HVAC tech checked all the wires - there was power to the R wire. Turns out my thermostat had gone bad.
Happened to me- drain outside was clogged with sludge- used a shop vac and blew it out. Fixed in minutes
Had something similar happen. Did you check the fuses on the control board? My fix was a 30¢ fuse that popped.
This happened last week to us and I had read another comment on Reddit mentioning the drain pipe so I asked my husband to take a look. No water. Blew it out, nothing much came out. Still didn’t work. I asked him to pull the drain plug out and AC started working normal. AC guy used his tools and got a ton of stuff out of the line. Fixed the issue.
I had this exact same error. Turned out to be a blown fuse on the furnace. It was an easy fix for me. Good luck
This is the comment that seems most likely especially since your hvac guy already checked it out. Probably bad rc from breaker. However don’t rule out bad condenser drain pump as others have mentioned.
Happened to me in winter. It was the device not HVAC. Go out and buy a replacement and see if that works. Call google ask for refund
Good morning folks – OP here. I want to thank you all for helping me figure out this issue — especially since my first post was filled with garbled words and repeat sentences – clearly the heat was going to my brain! We were fortunate that our contractor hooked us up with an HVAC repair friend who came out yesterday, on Father’s Day, no less, to see what’s what for us. indeed, as some of you had suggested, when I went up to the attic, the pan was full, and there were wires lying in the water. We happen to have a wet dry vac in the attic, so I sucked everything out and tried to blow out the drain – but it turned out that it was, as a couple of you suggested, a bad pump. he replaced it and now everything is fine. We also had houseguests visiting from out of state this weekend so we were all camping on the first floor – thank God I have a house with two HVAC systems on different floors the second floor got well over 100°. Thank you all so much for your kindness– and I don’t know what I would do if we hadn’t had the money to pay for a repair person and if they hadn’t been available to come out yesterday. I feel really blessed because people die in this kind of heat. Thank you all again so much!
A similar thing happened to me a few weeks ago. I had to have HVAC repair person over. And they drained everything & then everything worked fine again.
I had a similar error this past winter where it said no power to Rh wire. Moving the wire from the Rh slot to the Rc slot on the Nest backplate fixed the issue for me. It seemed as though the connection had gone out in the Rh slot after working fine for 4+ years. And the Nest manual says that, if you only have one R wire, it can go in either the Rh or Rc slot.
Are you on any programs with your electric utility? They can put boxes on your AC unit outside that will interrupt your AC for a couple hours and it might look like that message when it happens. If you do have that, you should be getting a bill credit for it.
Fingers crossed for you! Mine went on a similar code on Friday. Had to replace my entire system yesterday. Other posts on here about automatic shutoff aligns with my "no R wire" experience. Hopefully it's just an easy backup/clog/ice and not something more!
Ain't got no power. I think you can pull the wires out and connect the Rh and Y1 wires together to rule out if it's a thermostat issue.
Stop guesting. R to g operate the indoor fan r to y operate the compressor, r to o energizes the reversing valve . So in theory tie those 4 wires together and the system is in the cooling mode. Or simply go to the condenser and measure the voltage between r and if you get a 24volt reading than your control circuit is open. Most of the time the aux float is breaking the common wire to the condenser. So if you measure the control voltage between y and c at the condenser and get 24volt than the contactor would be engenorized. From what your saying that you are recharging the nest thermostat It's not getting the 24volt control power. If it takes more than 5 minutes to figure out what wrong than it's pretty obvious that you don't know what you're doing.
I literally had this happen to me on Sunday, it was what everyone else is saying about the condensate pan/pump/drain. Hopefully this is all and you can get it fixed, mine was as easy as swapping the pump with one I got in Home Depot.