Yes, you can tell. No, your guesses are incorrect.

How about call a HVAC guy to do it for you?

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Christopher A. Young
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"Peter" wrote in message
...
I'd like to find out whether there is any "standard" to the wiring between
home thermostats and the HVAC equipment.

The thermostats in my house are connected to the HVAC units in the
basement via a 5 conductor cable. Yellow, green, white, red, blue.

The blue is not connected. I *assume* that two of the other four are the
main on/off and the other two are for the fan on/auto switch. Can I tell
by color which is which or do I have to open up the thermostat and look?

Thanks.

Peter

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