wiring to thermostat

hidden1

Hi,does anyone by chance know what the operation of each circuit/wire to thermostat could be on the pic.Is blue usually temp/on off for ac ?.
its a older heat pump/ weathertron.
-any info is appreciated071012125711.jpg

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biggles

its not the colors it is the letters from there to the stat that are the loads to run

hvactech126

B = 24VAC common
R = 24VAC hot
Y = COMPRESSOR CONTACTOR
G = BLOWER
O = REVERSING VALVE
T = ODT
W = AUX HEAT
X2 = EMERGENCY HEAT

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hidden1

thanks.
-what is the l (is light blue between the g and o)

hvactech126

Fault indicator

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hidden1

Is there usually a wire attatched to this l- fault indicator (coming out as the rest are ) or is it suppose to be without a lead to thermostat..

scottmcd9999

Only if your thermostat can use it. In my area we rarely see that terminal hooked up.