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I am looking for someone to help me with a digital thermostat wiring

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Just follow the thermostat instructions but make sure you turn off the power first, hard to help with out knowing the type of system and thermostat

Posted on Aug 30, 2010


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Posted on Jan 02, 2017


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I have to replace the program Digital room thermostat T£6620B1008. Makers Honeywell, they no longer make these, what can I buy to replace it, I have someone that will wire it in, can you help please

All digital thermostats are "universal" for the most part. Remove what you have and verify that you have 4 wires connected or 5 wires. If it's a heat pump it's possible you have more wires then that. Depending on what you have, this will determine what you will want to purchase. Most hardware stores/home improvement carry t-stats.

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If the fan won't turn off at all it is either the thermostat or the fan relay in the unit itself. Remove the wire going to the G on the thermostat. If the fan cycles properly on heat then the problem is in the thermostat itself.

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I am replacing an T8411R with RTHL3550 and I have the following wires. Original vs New G=G,R=R,Y=Y,O=O......? I have a W2 and an E wire that go into different screws on original but no seperate terminal...

C is actually a power wire; it provides power for some programmable thermostats. You don't have to connect it on the new thermostat; cover the end with electrical tape to avoid it causing a short. (If you keep that wire accessible, it will be nice for someone who wants to use another programmable thermostat. The ones which can talk to wireless networks require this wire.)

Do you have a heat pump? That is the only time a thermostat uses an E wire.

The W2 wire should go to AUX (third screw terminal from the left) and the E wire should go to E (second screw terminal from the left). See page 25 (27 on the pdf) of the Quick Installation manual for the RTHL3550. This manual is available from Honeywell at .

I hope this helps.

Cindy Wells

Nov 03, 2013 | Heating & Cooling

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How do i hook my thermostat up to my furnace?

What Thermostat do you have and how many wires do you have going to the thermostat?

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Hooking up a digital thermostat, without instruction manual. o/b wire for heat pump, where do they go on sub base to thermostat, TH5110D10060807.

Make sure the NEW thermostat is for Heat Pump.. Now look at the sub-base.. The sub base will have a O/B terminal to connect the orange or blue wire to. Be sure to look back at the old thermostat to verify which wires landed on the O/B previously.. Let me know ig you have any more questions

Sep 04, 2010 | Honeywell Heating & Cooling

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I recently replaced my thermostat to digital and the air conditioner works great but the heat doesnt seem to get hot enough like it is blowing out room temperature air. when i replaced the thermostat there...

Sounds like you got the wrong thermostat.
The orange wire is for the reversing valve, which reverses the flow of refridgerant and changes the system from cooling mode, to heat mode.

If your thermostat has no terminal for the orange wire, (usually labled "O") then you have a thermostat that is not compatible with heat pumps.

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I have just purchased a honeywell ct87n, could you please provide a schematic in order to connect it properly. I had someone install a honeywell digital thermostat several months ago, he did not tag the...

G to the manufactures webpage and type in model # and look upspecs . r- red y-cool w-white g-fan .. The red should be connected to rh--rc already by a jumper wire.

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changing metnical Ranco Thermostat to Digital Ranco.

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there is nothing to do with thermostat
as thermostat is control for heating
it helps to maintain normal temperature
and if temperature exceeds it switches off the heater...............

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