WIRING F FROM FURNANCE TO THERMOSTAT

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MY THERMOSTAT STOPPED WORKING SO I BROUGHT HAD TO
BUY ANOTHER ONE.I HOOKED IT UP ACCORDINT YO THE INSTRUCTIONS.BUT IT WON'T WORK.I WAS TOLD THAT THE
WIRING MIGHT HAVE A SHORTAGE.HOW DO I FIND OUT IF
THERE IS A SHORTAGE?