Questions tagged [thermostat]

Mechanical or electrical device used to control a heating, ventilation, and air conditioning (HVAC) system, or other temperature reliant system.

Filter by
Sorted by
Tagged with
0
votes
0answers
15 views

Finding the Right Heating\AC Thermostat

I have a thermostat in my house that seems to have a very narrow temperature band. This causes it to cycle on and off more frequently that it probably should. I have noticed that when I set the ...
0
votes
0answers
47 views

My central heating comes on when it feels like it

I have checked the wireless thermostat is sending a demand signal to the receiver but boiler isn't firing up (BTW my hot water on demand is working fine). Later on the heating comes on until I turn it ...
2
votes
1answer
35 views

How do I convert an old Satchwell/Sunvic TLX2203 thermostat wiring to line voltage wiring?

I have an old Satchwell/Sunvic TLX2203 thermostat. It has 3 wires connected to it which look to be: switched live (green) live (red) neutral (black) (at least I think that's the case) I would like ...
0
votes
0answers
18 views

Heat pump thermostat wiring, can I leave the Optional C terminal empty?

We have an old Carrier Heat Pump system. The thermostat tells me that "C IS OPTIONAL WITH BATTERIES". The thermostat does have batteries. So I can leave the C terminal empty and use the ...
0
votes
1answer
52 views

How do I convert my fireplace switch into a thermostat switch?

I have a fireplace that's controlled by a regular on/off switch. How can I convert it into a thermostat switch so that the fireplace shuts off automatically whenever the room gets warm enough? If it ...
0
votes
0answers
17 views

New Thermostat / Re-wiring [closed]

I Had an I comfort WI-FI enabled Thermostat with 4 wires: R, I+, I-, and C. I bought a honey well TC3 and when i hookup the R and C wires there is no heat or cool function. Do i need to change the I+ ...
0
votes
1answer
43 views

Can I directly add a Common wire to this point on a 24VAC transformer, or will load be too high? (70mA)

Referencing This excellent answer I have a two wire furnace controller, 24VAC, no common. I measured the current draw of the relay (when the thermostat wires are shorted), it draws 0.2A Wish to add an ...
1
vote
1answer
31 views

Installing Nest From HoneyWell T8575D Condo 8-Wire thermostats

My condo apartment current has the HoneyWell T8575D installed and I want to switch to Nest. But I couldn't find which Nest port should the "Fan Common" line go into. The wiring from the wall ...
2
votes
1answer
21 views

HVAC: adding a C wire for Nest thermostat

Just installed a brand new gas boiler, want to keep using my existing Nest thermostat (they are compatible according to Nest). Current system only has two wires: Rh and W Nest is designed to steal ...
0
votes
0answers
27 views

Nest thermostat + SIMPLE dual transformer setup. What is wrong?

I have a a VERY SIMPLE dual transformer system (Rh is the heating transformer and Rc is cooling transformer) for heat all I need is (Rh + W1) for AC all I need is (Rc + Y1) With this dead simple ...
0
votes
0answers
33 views

Thermostat wiring identification - missing yellow wire/extra wires

Help please and apologies in advance for lack of technical knowledge! I'm looking to replace my old Honeywell 8022C 24v thermostat with a Nest, and have failed on several levels now I've taken a look ...
0
votes
0answers
41 views

Water heater not producing hot water but everything seems to be working?

We just bought a house and the previous owner had a brand new water heater installed. The first day we took a shower it was not very warm and the next day there was no hot water at all. I checked the ...
0
votes
3answers
60 views

Thermostat location in 3 story building

Where would you place the thermostat in a single zone, 3 story building. Tt's a multi-family residential, 3 units, one unit per floor. The boiler is a high-efficiency condensing boiler in the basement,...
0
votes
2answers
35 views

Baseboard heater powered by a switch, not thermostat

Our finished basement has electric baseboard heat. The baseboard is powered by a light switch, so I either have the heat on or off. Can I take out the switch and use the wiring to connect a digital ...
2
votes
2answers
172 views

How to verify that resistive load thermostat is dead

I have an electric heater, connected to a resistive load thermostat (240V). Yesterday we found the thermostat apparently totally dead (display off, etc). I've checked the breaker, of course. (There is ...
0
votes
0answers
25 views

Connecting New Thermostat C Wire To Transformer

Looking to add a C wire to my 2 zone system (new smart thermostat). Since the original wiring was 2 wire, I ran a new set of 5 wire lines. The link below shows how my current set-up is wired to the ...
2
votes
1answer
57 views

New ecobee3 lite, have heat but no cool option

I recently installed a new ecobee3 lite. When I completed the setup process, I found that there was no option to enable cooling. My original setup had both heat and cool options. I believe the option ...
0
votes
1answer
20 views

Different wirings on 2 thermostats controlled by a 2 minizone system

I was replacing my 2 thermostats controlled by a 2 mini zone system (Trol-A-Temp). One of the thermostat has 6 wires/terminals (Y,W,R,G,O,B). The other one has 3 wires/terminals (Y,W,R). I was ...
1
vote
1answer
40 views

Replacing old 2-pole line volt thermostats in a 120V hydronic heating system - is this configuration safe and acceptable?

I am replacing several old mechanical 120V 2-pole thermostats each of which controls both a blower fan (which blows air over hydronic coils to push warm air into the room) and a single central ...
1
vote
0answers
17 views

Horstmann C27 to Nest

I'm in progress of changing Horstmann C27 with Nest Learning Thermostat Gen3. I'll share the images below, I'm looking for a way of mapping the cables to the Nest. C27 supports both Hot Water and ...
1
vote
0answers
56 views

Need help changing from Trane thermostat to Honeywell T9

I currently have Trane thermostat (TH8320U1040) and trying to change it with Honeywell T9 thermostat. On Trane I currently have following terminals connected: Wire Color - Terminal Name Orange -...
2
votes
0answers
31 views

Changing Weathertron to Honeywell Thermostat

I have a GE Weathertron (model 3AAT80 1A1/2A1) that I want to switch over to a Honeywell (RTH6360). Most of the wiring seems straight forward, but ... R (Weathertron) to R (Honeywell) O ...
1
vote
2answers
38 views

Ecobee 3 - I have 3 Wires

I have three wires coming to the existing, very old, thermostat: Black, but wired to the "R" terminal of the current thermostat. White, but wired to the "W" terminal of the ...
2
votes
1answer
67 views

2 wire thermostat wire want to be able to select fan only

I have an older furnace with only 2 wires at the thermostat "white and red". No issues at all with my system works as should. Thermostat is new Honeywell basic model not smart. I want to ...
2
votes
2answers
84 views

Can I configure a two-stage thermostat to manage two heat systems?

The System I have a relatively simple system. It starts out with a standard, run-of-the-mill Rheem gas forced air setup with central air. One transformer in the furnace goes to one thermostat like ...
1
vote
1answer
41 views

Wiring Ecobee thermostat to Vulkan gas furnace with no C terminal

I am trying to wire up an Ecobee thermostat to an old (1997) Gas central heating system but I got up into the roof then realised I have no terminal labelled C. Now, I don't super know what I am doing, ...
0
votes
0answers
32 views

AC not blowing cool air, Contractor said HVAC unit is perfectly fine and that it has to do with my smart thermostat (Ecobee 3)

So basically I changed out the filter on my HVAC unit (National Comfort Products, Model CPG41238-U23) and after I did that the AC stopped blowing out cold air. It was working completely fine until I ...
0
votes
1answer
92 views

Did I fry my Furnace Control Board? (C -> G rewire attempt)

So while I was attempting to figure out how to get our fan to run independent of our heating/cooling, I looked at our thermostat wiring and discovered that it only had wires running to C, W, Y, and RC/...
0
votes
0answers
20 views

Need help with thermostat wiring

I am trying to change from an American Standard AYSTAT655 to a Honeywell RTH8560D but wiring does not match anything in the Honeywell manual. Anyone able to assist?
0
votes
1answer
24 views

Use Honeywell VisionPro without EIM?

I just acquired a Honeywell VisionPro TH9421C1004 thermostat but I didn't get the Equipment Interface Module (EIM) with it. Can I still wire this directly from my furnace? It only has 3 wire ...
1
vote
2answers
50 views

Thermostat wiring for fan only

I have a White Rogers 1E78-144. My house has heating only and no AC. https://climate.emerson.com/documents/ie78-non-programmable-thermostat-instructions-en-us-4209010.pdf The current wiring only ...
2
votes
0answers
107 views

How does this wiring work?

I have a Trane XV90 and XL 14i. The wiring looks a little strange as in the picture bellow. _____________ | | BK W2 W1 R G Y B/C YLO O |___||...
0
votes
0answers
14 views

Help with high limit thermostat replacement on Kenmore 110 series dryer?

My tenant’s dryer stopped heating, and when I took the back off to check the thermal coil the high limit thermostat fell into pieces. Ha, ok. Tested the circuit on the coil just in case and it’s fine. ...
0
votes
1answer
30 views

Blown Thermostat Twice and Dead Transformer

A year ago, I had a brand new smart thermostat that caused the A/C fuse to keep blowing. I replaced the thermostat with a duplicate, swapped the fuse out and everything has been fine. Now a year ...
0
votes
0answers
18 views

Furnace fan will not turn off

Our furnace fan runs continuously whether we have the switch set to ON or AUTOMATIC. How do we get the furnace fan to shut off without having to go downstairs and turning switch off manually?
1
vote
0answers
33 views

Two air handlers, one furnace, and an odd control system. What's the modern equivalent?

I have 2 air handlers, each has their own AC, and each of them have a hydronic heat coil that leads to one furnace. Air conditioning works well independently, but there's some weird controls when it ...
3
votes
0answers
53 views

How is an air handler's fan controlled if its control board doesn't have a G terminal?

Background I have a 2-stage cooling heat pump unit from Bryant, installed ~2006 (central Florida): Condenser model 698BNX048-B Handler model FE4ANB006 Shortly after moving in ~5 years ago, our evap ...
0
votes
0answers
29 views

Furnace fan operates only when heating is on

I don't have AC unit at my house, and summer heat is really bad when I sleep at night in my bedroom upstairs. Since I don't have AC, I think manually setting the fan "on" while I sleep will ...
0
votes
0answers
19 views

How to wire in gas boiler zone valves with out a zvc

Does anyone have a basic wiring schematic for wiring up 3 zone valves without a zone valve controller? They are honeywell zone valves. The boiler is brand new and everything is prewired. It just ...
0
votes
0answers
12 views

How to connect nest thermostat e for American standard heat pump 2005

current wining We have a 2005 heat pump. I tried b wire to nest C wire but it is not working
5
votes
1answer
57 views

Thermostat upgrade delivers heat instead of cooling

QUESTIONS The apartment heatpump delivered cool air (16 degrees delta). The thermostat was changed out with a Radiothermostat CT50. CT50 switch configuration setting include HP (Heatpump) and ...
0
votes
0answers
21 views

Installing a Honeywell HZ432 for four zone wireless heating

need help with wiring setup. Current setup Gas furnace (heating, no cooling): standard four zone gas furnace setup with hot water circulator 4 zones (3 wired, 1 wireless) Setup: Honeywell THM5320R (...
2
votes
0answers
40 views

Tracing a dead thermostat wire conductor in wall

My home was rewired and remodeled in 2014 but I am finding out that the electrician did not run a new thermostat wire from my upstairs thermostat. I have a newer-looking 4-conductor wire coming out of ...
0
votes
1answer
42 views

Why is my electric furnace warm if it isn't being used?

Our furnace has not been used as the weather has been fairly warm lately. It may have turned on for a minute the previous night, but I do not know. Anyways I was walking past furnace and noticed I ...
1
vote
1answer
2k views

Nest Thermostat says “delayed” and never turns AC on

New Nest, replacing an old thermostat. Image of old setup: Nest setup: The Nest says "cooling" with the blue screen for about 1 second, then switches to "delayed", then just ...
0
votes
0answers
13 views

Honeywell T6360 stopped working

When decorating I opened the thermostat cover to unscrew it from the wall. I never touched any wiring, decorated, screwed it back, closed cover, done! Now the thermostat won't work. Any ideas why this ...
0
votes
1answer
15 views

Trane VX99 furnace fan to run

I would like to have the fan turn on and blow non-a/c. I only see 2 wires coming from the thermostat. In
1
vote
2answers
26 views

how to add c wire to heat pump ac unit (only have wires with nuts)

I can’t figure out which is the C wire or how to make a C wire and how to connect it to my ecobee 3lite Power extender kit. My old thermostat has wires G,Y,RH, W/E, and O/B plugged in. No "C"...
2
votes
0answers
41 views

HVAC is heating when thermostat is off

I seem to have a problem with my thermostat. I have tested the wiring of my HVAC system by wire nutting the the power (R, red wire) to the AC (Y, black wire), heat (W, white wire), and fan (G, green ...
2
votes
1answer
86 views

Is this wiring dangerous? Smart Thermostat C-wire AC adapter twisted together

Is this wiring scenario dangerous? Is it likely produce sparks or damage my HVAC system? Please read the description and see the image below. Description I didn't have a C-wire for my Emerson Sensi ...

1
2 3 4 5
18