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Power asked How do I get this house thermostat connected, the old thermostat has 4 lead wires but new one has 5?
The new thermostat is a Honeywell Wi-Fi Programmable RTH6500WF wi-fi series The old one had 4 lead wires so the knew one has 5 & I can not find an extra 24 volt wire to make the new thermostat kick on. There is one extra wire in the harness that is not being used. Can that extra wire be used for the extra volts & if so where would I connect it to the furnace? The wires all go into a transformer. The therostat is not clicking on at all because I don't know where to get the 24 volts at.
And got the following answer:
It sounds like the thermostat you have requires a 'common' wire, which allows it to get its power (24 volts) from the indoor unit's low voltage transformer. This wire completes a circuit to the transformer, and a blue wire is typically used for this. The old thermostat probably used double or triple AAA batteries to power its relays and such. This means that all the thermostat is doing is routing the 24 volts from the transformer to relays back in the indoor unit and is not using this same 24 volt supply to power its internal functions. If you really want to use this thermostat, (if it truly does not allow for the use of batteries) the only option is to run a new thermostat bundle with at least 5 wire. I would go with 8. This would allow for additional features down the line, such as a heat pump. Depending on how/where the existing bundle is run, running a new lead can be a low to moderate skill level job all the way to a pain in the butt. One alternative to running a new wire is to simply get a thermostat that will allow you to run on a 4 wire configuration, which is any thermostat that allows the use of batteries. The Honeywell VisionPro line of thermostats are a good choice for the money for a reliable digital, LCD screen stat with the option of using batteries. Home Depot and Lowes carry them, and they come in non-programmable, programmable and touch screen varieties.