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manomanisch
Jan 5, 2009, 03:44 PM
I have an Armstrong Ultra II gas furnace and a Lux 1000 thermostat. I had this same problem with another thermostat and I installed the Lux 1000 and it worked fine for about six weeks and now it is starting to do it again. It is an intermittent problem. Any thoughts?
hvac1000
Jan 5, 2009, 04:42 PM
Look for a shorted wire in the thermostat wiring from stat to furnace. It can cause a intermittent situation like you have. To test unhook the R wire on the furnace itself and the furnace should turn off.