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My recommendation is to replace the thermostat with a Honeywell or Robertshaw rather than another junk RiteTemp. These are the cheapest and least reliable thermostats on the market.
You can get the Honeywell RTHL6350 at Lowes or Home Depot for about 50 bucks.
I will be more than happy to guide you in doing the replacement.
Let me know and we will go from here.