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Recently installed a noma programmable thermostat and same worked fine for four days but today the furnace would not shut off despite the temp rising to 78+F. The temp was set for 67F. The only way...

Recently installed a noma programmable thermostat and same was working fine for three or four days but this morning the furnace kept running. Temp was set @67F but furnace was still running @ 79+F...