Question about Honeywell Focus 6300B 5-2 Days Programmable Thermostat Heater

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Need to know which terminals run what

Old thermostat (same kind, honeywell 6300B) just replaced because the fan would never shut off unless we flipped a breaker.  All wires in heating/AC unit seem fine, so we got new thermostat.  When hooked up new thermostat as directed, would not even turn on (no response).  Need to know what the terminals operate, in case our heating/AC wiring is screwy.

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Had similar problem, continuous fan, turn off power, then won't start up. Replaced thermostat, no change. The main controller board in the furnace went bad. What was weird was that it happened in the summer, while the heat was turned off. One day I noticed that the fan was running. The thermostat was in the off position, and I had to shut off power to the furnace to make it stop. I forgot about it till heating season came along and it wouldn't start up. The preliminary blower would start, the gas would click on, it would light, then quit. After tracing and checking the various safety switches, etc. it became apparrent the main board was bad. I found one on ebay, replaced it, [a simple job, unplug, a few screws, replug] and it's been working fine..good luck, John

Posted on Nov 07, 2008

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1 Answer

How do I wire a Honeywell thermostat


Can I start by saying I am not in anyway saying to do this alone it is dangerous but if u must follow each step start by being safe shut off the breakers good luck here to help
Step 1
Turn the air conditioning and heating unit off by flipping the appropriate circuit breaker. Test the unit to make sure it's off by turning your existing thermostat to the "On" position and seeing if it turns on. Wiring a Honeywell thermostat when the circuit breaker is on could cause you to blow the transformer that powers the HVAC unit Step 2

Connect the red wires to the thermostat RH, thermostat RC or thermostat R terminal. The thermostat RC terminal has a jumper wire between thermostat RH and thermostat RC. The thermostat R terminal operates both the heating and cooling units, and contains an internal jumper wire. Basically, your red wire on a Honeywell thermostat is the hot wire that run. Step 3

Run the green wire to the thermostat G terminal. The green wire controls the relay that operates the blower, and it controls the fan. Step 4

Control your air conditioning when you connect the yellow wire. It connects to the thermostat Y terminal Step 5

Hook the white wire to the thermostat W terminal to control the heating unit

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I would ignore the missing "G" wire, and connect Red to both Rc and Rh, and Y to Y, and W to W.

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