I believe you've changed your thermostat, and the original had 5 wires R W G Y C. And your new has 4 wires with no C terminal. The C terminal is used so that batteries are not necessary. If you can't install batteries in the new tstat, get a tstat that has a battery option, or a 5 terminal/wire tsat. Hope this helps!
4 wire what? Was the unit working before this? Sounds like some wires crossed
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