Question about Honeywell Programmable Thermostat Heater

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I have power at the baseborad 120 on the redwire and 120 on the heater wire and 0 on thed black wire on the 2 heaters thermostat is a double pole I have 120 on all four poles no heat ????

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Sounds like you are missing a phase. Go and check your fuse panel for a blown fuse you should have 220 between red and black

Posted on Apr 05, 2011


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Cadet baseboard heater

If I have your information right you have a black wire and a white wire marked red coming to the heater with 240 volts between them. You have a double pole unit mounted thermostat with a red and a black wire. Most double pole thermostats have two red and two black wires on them so I am not sure if you have a double or a single pole thermostat.There are also two wires going to the baseboard heater. One is connected to the element the other to a high limit switch which is then connected to the other end of the element. If the thermostat is a double pole the two red (or load) wires should connect one to each of the baseboard wires. The two black (line) wires should connect one each to the two incoming power leads. If it is a single pole thermostat the one red wire should connect to one of the baseboard wires the black should connect to one of the incoming power wires the remaining baseboard and power wires should then be connected together. Hope this helps

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Baseborad heater doesn't stop working

There should be a thermostat on each unit, if not there should be a thermostat on the wall for it. There is always the chance that an installer or builder/landlord was too cheap to put one in. You can buy baseboard thermostats and put it in yourself if you can turn off the power. They can be purchased at a big box or other builders supply. If it is on 230 volts get the double pole version of the switch. It may be mind boggling for some to figure out where to put all the wires so you may need help from someone electrically inclined.

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Electric Wall heater programmable thermostat

First of all most home thermostats operate on 24volts. If you want to have one that directly turns the 240 volt power on and off you need to get a special 240V line voltage thermostat. How many wires come out of your heater? Most 240v circuits have three wires. A white wire for the common and two black or black red wires that are +120 volts and negative 120 volts. That's why a 240 volt plug has 3 prongs instead of two. If you look at the wiring diagram that comes with the thermostat it should give you an idea of how to hook the wires up. In your particular case though, I think I would try making friends with an electrician.

Nov 09, 2013 | Hardware & Accessories

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I have a problem with a state 30 gallon hot water heater,the tank states 240 v but there was only 120 running it ,it has one element ,everything was working until the outside water well pump quit since the...

Thermostat is rated 120-208-240-277 volts.
Element will work with any voltage too, no matter rating on label. It will burn at different temperatures at different voltaGES.
Any voltage should run water heater.
Copy following links:

Push in reset button.
Make sure tank was full of water before turning power ON. Or element will instantly burn out.

Are you testing voltage across top two screws on element.
Or are you testing each leg to ground?


If you need further help, I’m available over the phone at

Oct 31, 2013 | Water Heaters

1 Answer

Replace three wire thermostat with four wire thermostat

From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.

Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.

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1 Answer

Heater is not heating up.

First, is this a 120 VAC or 240 VAC heater? 120 VAC heater will usually have one Black & one White wire and 240 VAC heater will usually have two Black wires or one Black & one Red wire. If it is a 120 VAC heater then you need to supply the white wire at the heater with a neutral (white) wire from the breaker panel. If it is a 240 VAC heater then you need to verify that you have 240 VAC at the heater from Black lead to Red lead. If you are not sure about how to do this please have an experienced electrician look at it so you don't get electrocuted and/or burn up your new heater. Hope this helps!

Dec 09, 2008 | Fahrenheat Electric Convector Baseboard...

4 Answers

Properly installed electric baseboard heater won't work.

I am an electrician. You must measure the voltage across the black and red wires. Measuring each wire to the neutral will not cut it. If both your red and black wire are on the same phase the heater will not work.

To double check your wiring, measure the voltage across the two screws feeding your subpanel, they should be 240v or 208v depending on your power company. Then do the same at the breaker feeding your thermostat. Again it should read 240v.

If you have no potential across the screws it is possible that you installed an incorrect breaker. Not all breakers with two screws on them are 240v breakers. There is what is called a twin or split breaker that has two screws that are on the same phase. These are for wiring two 110v circuits, when you run out of spaces in the panel.

Double check everything. This is a relatively easy circuit to wire, even for homeowners. If the heater does not work them something is wrong so do not leave the circuit energized.

Nov 22, 2008 | Fahrenheat Electric Convector Baseboard...

1 Answer

Wiring a programmable thermostat for baseboard heater

The red and black is power and neutral. Green is just for the ground and that should tie into the ground wire for breaker or power wire .
The 2 black wire from thermostat should tie into the two red and black wire from your heater.
Just imagine you are wiring 1 heater to thermostat and just add the the next heater the same way

May 15, 2017 | Honeywell Programmable Thermostat Heater

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