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The red that is part of the cable that has the black connected to the black from the thermostat is part of the hot cable, a second red is part of a cable to the heater, and the third cable goes to the … You somehow need to verify that the new thermostat will work switching one leg of a hot circuit. …

You can easily find on Amazon or other retail sites a "24vac C wire adapter" and you can install the thermostat anywhere near a 120v receptacle. …

It looks like there is a jumper between the R and Rc so it doesn't matter which screw is used. Nothing shown here gives any indication why your display is not working.

You can, but if a 240v (or 208v) heater I advise against it. When the breaker is "on" the other leg will always be feeding through the heater and both wires that were connected to the stat will measur …

Yes, #18 is fine, it would serve no purpose to be any larger than the wire connecting the stat to the air handling equipment.

A simple voltage tester would work fine, you can test line to line and get 240v or line to ground to get 120v. Lack of voltage drop would only matter if you tested line to load when load is open. Even …

The furnace does not use the thermostat to operate fan during heat. … If you jumped G and W the fan only selection on stat would override thermostat temperature setting and would heat continuous until fan only is selected off. …

Based on this diagram of the control page 4 https://ww2-secure.justanswer.com/uploads/Wvfan79/2012-07-13_122319_twe036-sf-1d.pdf the "c" source is the blue wire leaving the transformer, which becomes …

You normally can, but not every digital thermostat will work. … Also my recollection and checking with a couple online manufacturers webpages is the Installation Instructions that come with baseboards specify either using a built in or wall thermostat. …

It sounds like you have the numbering correct. 240v is the result of any L1 and L2 connection, the NEC requires the handles be tied, so a two pole breaker or adjacent breakers are required. 1 and 2 ar …

Wire colors for t-stats (and most other circuits) below 50v are not color regulated by the NEC. There are "industry standards" that match color to letter of terminal, but in this situation the phrase …

An actual picture of the control board would help, but according to a wiring diagram that I can find any grey wire is the 0v reference from the 24v transformer.

This answer is somewhat incomplete because details weren't provided, but 6 wires is likely 3 cables, and you are probably using two-pole stats. One cable is hot from breaker. Wires are opposing 120v …

Assumption is your thermostat control system, like most, is a class 2 control circuit by definition in Article 725. So rules in Chapter 3 apply, as modified by Chapter 7. …

C should be pin 6 of molex connector, you should be able to trace it to a grounded lead on transformer.