I purchased a Honeywell digital t-stat RTH2410B. I have looked at a video posted here on installing a new controller. The problem is, in the video he only has 5 wires, red, yellow, white, green, gray. I have those wires plus a light blue wire. And according to the owners manual and installation instructions in the motor home, that wire is a 12V- wire. where do I hook it up at? The back of the new controller has B,O,G,Y,W/AUX,NOT USED,R AND Rc. R and Rc has a jumper across them from factory. I have red hooked to R ,yellow to Y, w to white, grey and green are the fan speed.

If your new one is for residential use, it probably won't work in the RV.Residential models work on 24V AC/DC from the furnace controller.RV units work off the 12 V supply.

Sam Spade wrote:If your new one is for residential use, it probably won't work in the RV.Residential models work on 24V AC/DC from the furnace controller.RV units work off the 12 V supply.Yea, that's what Shawn from India said when I called the 1-800#. But they will work off 12v. Did some searching on the web, found out you do not hook the blue ground wire up. But still could not get anything to work. Did some reading, tried hooking the red hot wire to the blower motor wire, nothing, tried the heat and a/c nothing, could hear relays clicking but nothing worked. Happened to look up at my volt meter plugged into an outlet and noticed it was on 0. Plugged the shore power in, and now everything works perfect. LOL.

It's a Beautiful Thing! Congratulations! Really, no kiddin', many won't even consider taking that wonderful upgrade on as DIY.

j-d wrote:It's a Beautiful Thing! Congratulations! Really, no kiddin', many won't even consider taking that wonderful upgrade on as DIY.Had it not been for not hooking up the shore power, I would of been done in 2 hours or less. It is an easy, cheap upgrade.

Yes you need shore power for th A/C Unit to work but furnace should work directly from battery Many 'residential digital t-stats' can be used in an RV.Hunter, Honeywell, LUX are just a few.Depending on how RV A/C-Furnace controls are set up some don't use the 'Blue Wire' (12V -) and some don't use the 'Red Wire' (12V +)Wires not used should be taped off and safely tucked inside t-stat panel (don't lose them back inside wall---might need in future)A/C Fan wiring-----you can install a mini toggle switch to switch speeds from high to low, some can be wired just with Hi Speed wire or LO speed wire, some need both wires connected in order for just HI Speed.But residential t-stats can be used in RVs------just need to use ones that operate the display using AA batteries

installing digital t-stat help needed | Good Sam Community

j-d
Explorer II
Mar 30, 2016
It's a Beautiful Thing! Congratulations! Really, no kiddin', many won't even consider taking that wonderful upgrade on as DIY.
kwplot34
Explorer
Mar 30, 2016
Sam Spade wrote:
If your new one is for residential use, it probably won't work in the RV.

Residential models work on 24V AC/DC from the furnace controller.
RV units work off the 12 V supply.

Yea, that's what Shawn from India said when I called the 1-800#. But they will work off 12v. Did some searching on the web, found out you do not hook the blue ground wire up. But still could not get anything to work. Did some reading, tried hooking the red hot wire to the blower motor wire, nothing, tried the heat and a/c nothing, could hear relays clicking but nothing worked. Happened to look up at my volt meter plugged into an outlet and noticed it was on 0. Plugged the shore power in, and now everything works perfect. LOL.
Sam_Spade
Explorer
Mar 30, 2016
If your new one is for residential use, it probably won't work in the RV.

Residential models work on 24V AC/DC from the furnace controller.
RV units work off the 12 V supply.

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