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Started By
Message
WiFi Thermostat not getting power
Posted on 6/21/21 at 8:26 pm
Posted on 6/21/21 at 8:26 pm
I have 2 of these:
Honeywell RTH9580WF Wi-Fi Smart Thermostat
I've used them for several years without any issue. The main unit thermostat works perfectly. My bedroom thermostat went out this morning. The screen will not power on.
These thermostats can be easily popped off. So, I swapped them. The bedroom thermostat works on the main unit's base and vice versa, so it's not defective, I don't believe. But when the bedroom thermostat is placed back on its original base, it is completely dead.
I decided to buy the latest version this afternoon, the Honeywell RTH9585WF1004/U
Basically, looks the same, but the backing is slightly different, so there not interchangeable. I wired up the new backing, popped the new RTH9585WF1004 on --- and nothing. Completely "dead."
All other outlets in my bedroom where the bedroom thermostat is placed work as they should, so I don't think I have a breaker issue? I checked my breaker box inside and I don't see any that have "tripped." I also checked the outside outlet where A/C is plugged in and all appears fine as well.
Is this a transformer issue on the A/C unit itself?
A bad fuse somewhere other than thermostat?
Or something else?
Honeywell RTH9580WF Wi-Fi Smart Thermostat
I've used them for several years without any issue. The main unit thermostat works perfectly. My bedroom thermostat went out this morning. The screen will not power on.
These thermostats can be easily popped off. So, I swapped them. The bedroom thermostat works on the main unit's base and vice versa, so it's not defective, I don't believe. But when the bedroom thermostat is placed back on its original base, it is completely dead.
I decided to buy the latest version this afternoon, the Honeywell RTH9585WF1004/U
Basically, looks the same, but the backing is slightly different, so there not interchangeable. I wired up the new backing, popped the new RTH9585WF1004 on --- and nothing. Completely "dead."
All other outlets in my bedroom where the bedroom thermostat is placed work as they should, so I don't think I have a breaker issue? I checked my breaker box inside and I don't see any that have "tripped." I also checked the outside outlet where A/C is plugged in and all appears fine as well.
Is this a transformer issue on the A/C unit itself?
A bad fuse somewhere other than thermostat?
Or something else?
This post was edited on 6/21/21 at 8:28 pm
8
Posted on 6/21/21 at 8:47 pm to Will Cover
Float switch is tripped.
Or there’s a blown fuse on the AC panel. This happened to me. Had to find a 2.5A mini fuse (like for a car) at like midnight one day.
Or there’s a blown fuse on the AC panel. This happened to me. Had to find a 2.5A mini fuse (like for a car) at like midnight one day.
Posted on 6/21/21 at 9:09 pm to LSUtigerME
quote:
Float switch
Happened to me with my Nest. Thermostat was acting crazy and wouldn't work, made me think it was dying or power line to it bad. Ended up being the float switch tripped because line was blocked.
Posted on 6/21/21 at 9:40 pm to Will Cover
Had a thermostat not getting power years ago... fn squirrels chewed through the wire.
If I remember correctly mine was fed from the unit via 24v transformer.
If I remember correctly mine was fed from the unit via 24v transformer.
Posted on 6/22/21 at 8:03 am to Will Cover
My nest was doing the same thing, finally figured out there was a small fuse (5-10A) on the main board of my air handling unit that was blown. It’s just a small car fuse so it’s easy to ID and change. You can get the fuse at Autozone.
Posted on 6/22/21 at 8:11 am to Will Cover
As others have mentioned, it’s likely the float switch, which means your drain pan is filled with water.
It also depends how the unit was originally wired up - some contractors wire the float switch to turn off the entire unit and others wire it to simply cut off the compressor so the fan can still run. Sounds like yours is turning off the whole unit.
If the drain pan in the attic is empty, check the fuse on the control board in the air handler (unit in attic). If the fuse is blown, the control wire (24V) likely touched another wire and tripped the fuse. But since the failure came out of nowhere, it’s likely the float switch. Pour some bleach down your condensate drain line.
It also depends how the unit was originally wired up - some contractors wire the float switch to turn off the entire unit and others wire it to simply cut off the compressor so the fan can still run. Sounds like yours is turning off the whole unit.
If the drain pan in the attic is empty, check the fuse on the control board in the air handler (unit in attic). If the fuse is blown, the control wire (24V) likely touched another wire and tripped the fuse. But since the failure came out of nowhere, it’s likely the float switch. Pour some bleach down your condensate drain line.
Posted on 6/22/21 at 8:30 am to Will Cover
not to hijack but how do you like that thermostat? I'm looking to upgrade my thermstats and I'm looking at that model and and the cheaper nest
Posted on 6/22/21 at 9:13 am to Will Cover
Depending on where is located:
Check your float kill switch or if you have a pump shake it.
Happened to me last month and this took care of problem. Thermostat will turn off if the float switch is tripped or pump stops pumping.
Check your float kill switch or if you have a pump shake it.
Happened to me last month and this took care of problem. Thermostat will turn off if the float switch is tripped or pump stops pumping.
Posted on 6/22/21 at 9:27 am to slapahoe
quote:
not to hijack but how do you like that thermostat
I have two Honeywell thermostats for my units and love them. I even took my old one from my previous house with me when I moved. They are super easy to program with the app and I even get periodic emails from Honeywell showing my cool and heat usage compared to last year.
I went out of town this past weekend and did a permanent hold of 75 degrees at my house. On the drive home I turned them back to the normal schedule and the house was nice and cool when I arrived. Love it.
Posted on 6/22/21 at 1:20 pm to Will Cover
So you place the main thermostat on the bedroom base and it worked?
Posted on 6/22/21 at 10:56 pm to LSUtigerME
quote:
Float switch is tripped.
This was the issue, thank you.
Posted on 6/22/21 at 10:59 pm to bapple
quote:
it’s likely the float switch, which means your drain pan is filled with water.
Yes, it was filled.
quote:
It also depends how the unit was originally wired up - some contractors wire the float switch to turn off the entire unit and others wire it to simply cut off the compressor so the fan can still run. Sounds like yours is turning off the whole unit.
Yes, this is how it was initially wired. The same company today services my AC unit installed my AC unit. The AC technician said they do this way to prevent water from coming down from the walls and ceiling.
quote:
it’s likely the float switch. Pour some bleach down your condensate drain line.
I had some "trash" in my line. And the AC technician said every time I am up in my attic to pour about a 1/4 cup bleach down the condensate drain line. And to change my filters regularly (which I do).
Posted on 6/22/21 at 11:01 pm to slapahoe
quote:
not to hijack but how do you like that thermostat? I'm looking to upgrade my thermstats and I'm looking at that model and and the cheaper nest
I really like them. I keep my "smart" devices separate, i.e., I don't connect them to Apple, Alexa, etc.
The Honeywell app is very simple to use. Allows me to set the temparature home or away, set a schedule, etc. The interface of the actual device is very easy to use as well. I recommend them.
Posted on 6/22/21 at 11:02 pm to Dandy Chiggins
quote:
Check your float kill switch
quote:
Thermostat will turn off if the float switch is tripped or pump stops pumping.
This was my exact situation and issue. Simple fix.
Posted on 6/22/21 at 11:06 pm to lsujunky
quote:
So you place the main thermostat on the bedroom base and it worked?
The two thermostats that I have are identical to each other. The "face" of the thermostat can be popped off and switched to either base (bedroom thermostat or main room thermostat).
I checked what I thought was the "defective" thermostat in the working main room base thermostat and it worked. But before I realized that it was the float switch that was filled, I tried a brand new thermostat that I bought at the store. It would not power on either due to a safety precautionary measure with the drip pan being full ... so crisis averted.
Posted on 6/23/21 at 3:05 pm to Will Cover
quote:
A bad fuse somewhere other than thermostat?
Had this happen....it was a fuse between the unit cutoff switch and the thermostat.
That fuse isn't code in my area so I had the electrician bypass it.
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