System is on calling for heat.Furnace will not come on when temps falls below thermostat temps and if it eventually does comes on it cuts out below thermostat programmed temps. When this happens one of the two green furnace lights blinks once repeatedly.This seems to happen when it is really cold outside. At other times the furnace works fine.
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The Ruud furnace is probably compatible. Power stealing is a way to recharge the thermostat battery from the 24vac control voltage used to operate the furnace. If you install the Thermostat in the "separate power supply mode" it does not need to power steal ever and will be much more reliable. Some thermostats don't get enough power in the power steal mode to keep the battery reliably recharged, especially during the cold winter months because the poiwer available to "power steal" is highest when the furnace is NOT running. You will need a separate 24 vac transformer and some wire.
I would try to check your return air first, making sure there is no blockage and that your air filters are clean. It almost sounds like when you take the cover off, you are pulling enough air into the system for it to run, but as soon as you close it off, it's not getting enough air flow, therefore, tripping a limit switch inside the furnace. Most furnaces will also have the codes for the flashing lights and what they mean on the inside of the door covers.
Look on the condensor, (outdoor unit) at the very bottom of the rear panel and you should find a red reset button. push it. If that does not solve the problem, and the outdoor unit is running (make sure both the fan AND the compressor are running) then you are looking at a low refridgerant issue and possibly dirty coils.
In that case, clean the coils and have refridgerant added.
does the furnace ignite?? your system may not have been lighting and has gone into ignition lockout count the codes of the led lights then remove panel led diagnostic codes are listed there.
if led codes indicate no problem verify capacitor is good and that mtr is getting 115 volts.