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HVAC guys - thermostat issue (1 Viewer)

coyote5

Footballguy
Alright I know we have some HVAC guys around, and here's my issue - 

With this heating season it seems like my thermostat is not cycling my furnace off when the temp reaches the set point.  For instance when it is set at 69, it will run up to 70 and continue heating when the thermostat is reading 70 for several minutes before cycling off.  I don't recall having this issue in the past.  I know these things aren't instantaneous, but i've not seen it run beyond the set point this way before, it would turn off within a minute or so of hitting the set point.  

I've replaced the batteries twice in the past month.  The first time because the thermostat wasn't turning the furnace off at all, it was up to 74 (set 69) when I noticed.  The 2nd time was to try to solve this delayed cycle issue.  Do I need to contemplate a new thermostat at this point?  The wiring for it does not have a constant power wire - how easy is that to add?

 
Alright I know we have some HVAC guys around, and here's my issue - 

With this heating season it seems like my thermostat is not cycling my furnace off when the temp reaches the set point.  For instance when it is set at 69, it will run up to 70 and continue heating when the thermostat is reading 70 for several minutes before cycling off.  I don't recall having this issue in the past.  I know these things aren't instantaneous, but i've not seen it run beyond the set point this way before, it would turn off within a minute or so of hitting the set point.  

I've replaced the batteries twice in the past month.  The first time because the thermostat wasn't turning the furnace off at all, it was up to 74 (set 69) when I noticed.  The 2nd time was to try to solve this delayed cycle issue.  Do I need to contemplate a new thermostat at this point?  The wiring for it does not have a constant power wire - how easy is that to add?
Tape a bag of frozen peas to your thermostat.  

 
It's called a hysteresis and prevents relay chatter.  Very common in process control and nothing to worry about. 

 
My place came with a Nest thermostat. It's the bane of my existence. Does anyone have one? I am constantly disabling EcoSense, Auto-Scheduling, Home/Away Assist.. EVERYTHING. It is not connected to my network. Yet it insists on "learning" my patterns. Last night I fell asleep on the couch (Nest is in the bedroom), was sound asleep, sleeping comfortably, but woke up SWEATING because the thermostat assumed I wasn't home because it didn't sense me inside the house. The problem is that I was inside the house. Sleeping. On the couch.

Imagine how pissed off you get when one of your family members adjusts the thermostat - that super-annoyed feeling you get, being uncomfortable in your home when all you wanted to do was "chill out," so to speak. Now imagine it's the thermostat itself pissing you off, every day. Also, trust me, I've tried Googling all this stuff to find a simple solution. There's not one. It's all Q&A, forum-type support stuff that you receive. I really wish I knew how to make this thing stop trying to "learn" my heating/cooling habits, because I want to take a freakin' axe to this thing.

 
My place came with a Nest thermostat. It's the bane of my existence. Does anyone have one? I am constantly disabling EcoSense, Auto-Scheduling, Home/Away Assist.. EVERYTHING. It is not connected to my network. Yet it insists on "learning" my patterns. Last night I fell asleep on the couch (Nest is in the bedroom), was sound asleep, sleeping comfortably, but woke up SWEATING because the thermostat assumed I wasn't home because it didn't sense me inside the house. The problem is that I was inside the house. Sleeping. On the couch.

Imagine how pissed off you get when one of your family members adjusts the thermostat - that super-annoyed feeling you get, being uncomfortable in your home when all you wanted to do was "chill out," so to speak. Now imagine it's the thermostat itself pissing you off, every day. Also, trust me, I've tried Googling all this stuff to find a simple solution. There's not one. It's all Q&A, forum-type support stuff that you receive. I really wish I knew how to make this thing stop trying to "learn" my heating/cooling habits, because I want to take a freakin' axe to this thing.
I had a similar experience with a Carrier Infinity thermostat at work.  I work for a private foundation and am the lone employee in a 3 story building that was originally built as a residence.  We replaced an A/C unit last summer in a 2 zone system; the replacement cooling the single rooms on each of the three floors on the west side of the building.  The thermostat is located in the conference room/dining room on the first floor.

 Since I'm the only person in this 5,300 sq ft building, I keep the thermostats set at 75 degrees. This damn new A/C unit never ran!  Why?  The f'in thermostat has an occupancy sensor and I work on the second floor. There is a lone bedroom on the 3rd floor and this setup would never keep you cool or warm. I read through the user's manual, located the sensors screen and turned the occupancy sensor off, and set the cooling temp to 78.  Viola!

Read your manual?

 
Last edited by a moderator:
My place came with a Nest thermostat. It's the bane of my existence. Does anyone have one? I am constantly disabling EcoSense, Auto-Scheduling, Home/Away Assist.. EVERYTHING. It is not connected to my network. Yet it insists on "learning" my patterns. Last night I fell asleep on the couch (Nest is in the bedroom), was sound asleep, sleeping comfortably, but woke up SWEATING because the thermostat assumed I wasn't home because it didn't sense me inside the house. The problem is that I was inside the house. Sleeping. On the couch.

Imagine how pissed off you get when one of your family members adjusts the thermostat - that super-annoyed feeling you get, being uncomfortable in your home when all you wanted to do was "chill out," so to speak. Now imagine it's the thermostat itself pissing you off, every day. Also, trust me, I've tried Googling all this stuff to find a simple solution. There's not one. It's all Q&A, forum-type support stuff that you receive. I really wish I knew how to make this thing stop trying to "learn" my heating/cooling habits, because I want to take a freakin' axe to this thing.
Replace your stat. 

 
My place came with a Nest thermostat. It's the bane of my existence. Does anyone have one? I am constantly disabling EcoSense, Auto-Scheduling, Home/Away Assist.. EVERYTHING. It is not connected to my network. Yet it insists on "learning" my patterns. Last night I fell asleep on the couch (Nest is in the bedroom), was sound asleep, sleeping comfortably, but woke up SWEATING because the thermostat assumed I wasn't home because it didn't sense me inside the house. The problem is that I was inside the house. Sleeping. On the couch.

Imagine how pissed off you get when one of your family members adjusts the thermostat - that super-annoyed feeling you get, being uncomfortable in your home when all you wanted to do was "chill out," so to speak. Now imagine it's the thermostat itself pissing you off, every day. Also, trust me, I've tried Googling all this stuff to find a simple solution. There's not one. It's all Q&A, forum-type support stuff that you receive. I really wish I knew how to make this thing stop trying to "learn" my heating/cooling habits, because I want to take a freakin' axe to this thing.
I had the same issue with mine. I figured out it wasn't sensing my cell phone and thought I was away. Therefore only movement was turning it on. I ended up resetting the whole thermostat from scratch and it fixed it. 

 
I didn't see if this was a gas furnace, but they run the fan for a while after the burner has kicked off to clear the system of any residual gas.  Also hysteresis, as mentioned above, can have the combined effect of it seeming like it is running well past the set point.

 

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