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2answers
71 views

Baseboard heaters turn off before reaching desired temp

We recently renovated our condo and replaced the baseboard heaters. An licensed electrician did all of the electrical. Now, during a cold snap, the heaters on one thermostat are turning on and off, ...
3
votes
3answers
273 views

How to test whether or not a breaker is powering a zone valve and thermostat?

I have a fuel burner (fuel oil) that heats water and provides my home with baseboard heat. I have two thermostats and zone valves, both by White Rogers (and both pretty old): one set for the ...
0
votes
0answers
28 views

Rated ampacity of water heater thermostat

What is the rated ampacity of "standard" water heater thermostats? The kind you see all over the place from a million different vendors. I cannot seem to find an electrical data sheet on any ...
0
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0answers
23 views

Nest thermostat. No fan with heating

Here is how my Nest behaves with 3 different scenarios. My question is how can I get my fan to turn on automatically with my heat. Is it possible i have it wired incorrectly? Attached is my wiring ...
0
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0answers
38 views

Wire placement for Honeywell evohome WiFi Controller power supply socket soldering

I'd like to solder the wires that have come loose from the socket of the power supply for my Honeywell evohome WiFi Controller but I don't know where the wires need to connect to the socket. Grateful ...
1
vote
4answers
600 views

All wires in thermostat junction box have high voltage

I'm a new homeowner and I'm trying to improve the heating in my new place! The heating is done with baseboards and it is currently using th104plus thermostats. My goal is to replace it with Mysa! In ...
0
votes
0answers
22 views

Should I replace my damper motor?

I have a wood burning furnace that has a thermostat-controlled damper. The damper motor is mounted on the ceiling and has a lever arm with a long chain that raises and lowers the damper to let more ...
1
vote
0answers
64 views

Thermostat calling for heat but brand new Taco Zone Switch not opening?

I have a trusty old gas boiler that succeeded at providing baseboard heat to 2 zones for years. I recently had a third zone added. This is a 2-wire, heat-only system. The electrician tried and couldn'...
0
votes
1answer
35 views

Wiring C wire in at a older unit

e3eb-012h is the model number for a wiring diagram... Trying to add a WiFi thermostat to my house, there is a blue wire ran but like most other topics on here it is not currently connected at the unit ...
1
vote
0answers
178 views

Can I replace this old mercury thermostat with a digital one for wood/oil furnace?

I recently moved into a house that was built around 1999, and it has an old Newmac wood/oil combo furnace that seems to be the original heating equipment. It has two separate thermostats in the ...
1
vote
1answer
52 views

28V at furnace, 0V at previously working thermostat

This is a followup to an earlier question I posted where it appeared that the previously unused Common wire on my HVAC system was damaged. All of the other wires read 28V between them and R, and the ...
2
votes
1answer
155 views

Low voltage over C wire at thermostat

Similarly to this question of the same name, I am reading low voltage over the R,C wires at the thermostat. Unlike that question, however, the voltage is unusably low. I am only reading 2V over R,C ...
2
votes
1answer
71 views

DCS RGU 366 oven doesn't turn on

I have: DCS RGU 366-N oven Symptom: When I try to start oven, the ring lights will light up, but gas never flows, and ignition never starts. Checked: The stove burners work. I hear the relais click ...
1
vote
1answer
84 views

Wiring smart thermostat with existing wire?

I've had a thermostat(2xAAA powered) for my gas heater wired via two wires from the second to first floor. My question is I'm looking into the actual wire that is in the wall and it looks like either ...
2
votes
2answers
526 views

Adding a C wire for a Nest thermostat

I tried upgrading to a Nest thermostat, and that's how I discovered I don't have a C wire... I'm thinking how to add it. I have some interesting situation: single furnace, and 4 zones connected to it ...
1
vote
0answers
34 views

Thermotstat Wiring Confusion

I live in a condo with hot water baseboards that are connected to a shared boiler system. I currently have a simple bimetallic strip thermostat that I'd like to replace with a digital or a smart ...
1
vote
0answers
92 views

For a smart thermostat, where do I attach the C wire to my furnace?

I know I've seen several questions out there about getting a C wire for a smart thermostat, however after all the research I've done and people who have given me guidance so far I have still had no ...
0
votes
1answer
96 views

Family installed a new Nest thermostat without photos of old wiring. Please help rewire 4-wire system to restore AC functionality!

Photo Album of current furnace, setup, and wiring: https://imgur.com/a/VYa2MnT Hi guys, I'm in town visiting my family for the summer. They installed a Nest thermostat without taking any photos of the ...
0
votes
1answer
59 views

C-wire on Weil McLain cGA Gold has low voltage

I am trying to run a new c-wire for my new ecobee thermostat. When I finished running the c-wire from the thermostat it did not turn on. I tested the voltage at the boiler and it is only reading 17ac ...
0
votes
2answers
82 views

I have seven 24v 2amp thermostats. Do I just need a single 24v 2amp power supply to power them?

I have seven 24v 2amp thermostats. The thermostat wires all feed to the same place. Do I just need a single 24v 2amp power supply to power them? The thermostats are Tekmar 532. They will connect to a ...
1
vote
1answer
93 views

Trying to add a 'C' wire to my thermostat

I recently got a smart thermostat that requires a 'C' wire. My existing thermostat had only W1, W2, R, G. After removing the faceplate, I noticed there was what looked to be an unused yellow wire in ...
0
votes
0answers
57 views

How to install a thermostat for electric heat?

I have a 240v electric heat in my house. I’m trying to switch my thermostat from an old Mears to a new Mysa smart thermostat. I have six wires coming from the gang box. 1 set is to the heater( load) ...
0
votes
1answer
114 views

Will a double pole, 240V thermostat work here and here? Wiring for 1.5v old brain

Facts: Existing heater circuit, 30 amps, 240V has two WALL HEATERS AND two thermostats in two different rooms. (For the furnace-focused, milliamp minds, you can move on to another question). ;) ...
0
votes
0answers
16 views

HVAC Gas furnace with added heat pump. Thermostat loses power while heating with gas

I have a medium efficiency gas furnace with an add-on Trane air to air heat pump. The heat pump kit is TAYPLUS103A. I noticed that in cold weather when the gas furnace runs, the gas ignites, and ...
1
vote
3answers
220 views

How do you estimate the probability of failure in this case? [closed]

The fan relay draws 6.0A. That is a safe current for 16 gauge wire. The safety fuse is tripped at 15A which is too much 16 gauge wire. This installation guide shows the Installation Instructions for ...
1
vote
2answers
496 views

Electric Heat Thermostat Wiring

I am trying to wire a new thermostat, unfortunately i neglected to take a picture of the old wiring. I believe I have an understanding of how it needs to be wires but i could use a second opinion. Can ...
2
votes
1answer
722 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
298 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 ...
1
vote
2answers
520 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 ...
1
vote
1answer
144 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
2answers
255 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"...
1
vote
1answer
2k views

Replacing old 3-wire line voltage single-pole thermostat with a 2-wire one

I'm trying to replace an old Mears M21 SP thermostat controlling the baseboard heater with a new one (Honeywell RLV3120A to be specific). Problem is, the old thermostat has 3 wires (Black, Red, and ...
1
vote
1answer
5k views

Why is Thermostat Y wire connected to C terminal on furnace?

I have a Nest E thermostat, and like many others have lost wifi and getting low battery because I have no common wire connected. After looking at my old Lennnox 78ugf3-75-1 furnace, I noticed that my ...
0
votes
1answer
278 views

wiring hrv in a confusing house

some beautiful pictures first time posting apologies if my placement is off Buying HRV. I am debating between two units, venmar evo5-700 which doesn’t support furnace interlock or lifebreath rnc205, ...
0
votes
1answer
514 views

replace fireplace switch with nest thermostat

I have a fireplace wired up to a switch (simple off/on), and I want to throw a Nest thermostat on there. It has a black and white wire coming out of the wall. I think the white goes to the W1 and ...
0
votes
2answers
1k views

How to correctly wire a bathroom heater switch

I have an old Honeywell thermostat-type switch that controls the heater in the bathroom. Teenagers frequently forget to turn it off and so it runs for hours. I want to replace it with a push-button ...
2
votes
1answer
874 views

240V wiring and a thermostat

Newbie here. I do a bit of home electrical work at the most basic level. (Replacing outlets and switches. Running a new line off an existing outlet. Nothing that would even elevate me to an amateur ...
0
votes
0answers
117 views

Issue Installing Ecobee 4 on 4 zone boiler with Aquastat

I have a 4 zone valve boiler system. Each of the zone valves is Honeywell. I have a 24-volt transformer along with an aquastat. I have attached a photo of the wiring diagram from what I can tell ...
1
vote
2answers
697 views

Low Voltage C-Wire at Thermostat

Looking to install an ecobee thermostat and decided to measure my common wire before unhooking anything. I tested the R, C wires and see they are only reading 14v, whereas R,Y, and R,W are reading 28v....
1
vote
1answer
2k views

Air conditioner locating c wire on old unit

Hi guys I'm trying to figure out I'm using a dual heat and cool thermostat so i decided to get myself a smart thermostat and want to connect both thermostats into 1 but I'm having trouble location the ...
0
votes
1answer
1k views

Can I use a nest thermostat for two heating sources (Furnace and electric floor heating)

Current situation: My home is currently heated with central air. Not my first choice, but that's what I have. I have brand new 98% efficient modulating furnace controlled by a Nest thermostat(no AC)...
1
vote
2answers
1k views

Electric water heater thermostat keeps tripping and needing reset

I have a 40-gal A.O. Smith Promax electric water heater (see pics below). It was a few years old when we bought the house, and we've been living here about 10 years. So I realize the heater may be ...
3
votes
2answers
676 views

Identify voltage by looking into gang box

I was replacing few of my old manual thermostats with smart thermostats. While installing the new ones, I noticed that some of the gang boxes have 4 wires (2 black, 2 red). Some of them have 6 wires (...
0
votes
0answers
52 views

Nest thermostat wiring problems

Removing my old Honeywell thermostat to replace with the nest. I live in Florida and my ac unit is 10 years old. I’m not sure if I have conventional heat or a pump. I took a picture of the old one but ...
0
votes
1answer
958 views

Where do I connect C-wire to Burnham boiler?

I'm adding a smart thermostat to one zone of a two wire, oil fired boiler system. I've roughed in a new wire and could use some help determining where to terminate it at the boiler. The wiring is far ...
1
vote
1answer
849 views

Adding a C wire and fixing White vs Red on my Furnace

TLDR: I think I need to flip R and W wires, and to splice the blue (C) wire to the brown wire coming of the transformer. Is this correct? Long version: Like many others on here, I'm trying to add a ...
1
vote
1answer
1k views

Old electric baseboard heater thermostat wiring

I have a question about an old federal pacific baseboard heater thermostat's wiring. I disconnected this thermostat 2 weeks ago, thinking that we were going to remove the heater. Now we've decided to ...
2
votes
1answer
834 views

Where does my C wire go in this splice connection?

I'm looking to install the Ecobee3 Lite thermostat. My current thermostat has a blue C wire running to it, so my understanding is the PEK doesn't help because that is used if you have no C wire. On ...
0
votes
0answers
78 views

Did the handyman screw up or is there something wrong with my AC unit?

My landlord recently hired someone to install a common wire from my Goodman AC unit on the roof down to where the thermostat is. The current thermostat works fine, but is non programmable and battery ...
18
votes
2answers
7k views

Do I need to be legally qualified to install a Hive smart thermostat?

As a competent DIY'er, am I legally allowed to install Hive myself? The reason for the question is I have been asked to provide a cert as I'm selling the house. If not, can someone point me in the ...