Programmable Thermostat White Rogers 474045?

mc1cavity

New member
I installed a digital programmable thermostat last winter.
I now want it switch to A/C
And it tells me via a blinking snowflake that the
Compressor is in Lockout Mode
Needless to say, the air will not come on-nor the fan.
Heat works and fan works in heat mode.
No A/C
 
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