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Sorry I haven't replied, it hasn't been cold enough to kick on the furnace lately. The last time the unit tripped, the LED flashed 1 time and then a 2 sec pause which indicates a 1 hour lockdown.
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Yes, the furnace worked fine before changing to the new thermostat. However, I have the same unit upstairs and it runs like a champ with the new thermostat.

The unit is a model 1x2000 and the thermostat is a Hunter 44860. I opened the access panel and noticed that there are 3 lights: from left to right, 1) flame 2) OK 3) PWR. It is the "OK" light that...

My bad, sorry.

It's a Rheem Classic 90 Plus only about four/five years old.

The middle of three LED light blinks on and off for one second intervals. The unit will reset itself and kick back...

I recently installed two new programmable thermostats in my house, one for the upstairs unit, one for the downstairs unit. The upstairs functions great. It's a bit different on the first floor...
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