Temp in house is below minimum set on thermostat and heat does not come on. I can turn thermostat off and back on and heat will come on but only for short time. I have replaced thermostat and no change
The problem is inside the furnace. It can be several reasons. Look at the "Klixon" switch near the burner. It usually goes first. Then there's a thermocouple that has a sensor that must have the flame touching it in order to hold the gas valve open. The wiring diagram on the furnace has all the safety and operational components to check.
SOURCE: RUUD (Protech Model 500) Thermostat Single Stage Not Programable
problem is not the thermostat, thermostat is an on-off switch that happens to work on temperature. Your furnace is locking out. cycling the heat off switch resets the micro-processor in the furnace. You need to diagnose the problem in the furnace, to go further we will need the model and approximate age of the unit
SOURCE: ruud achiever 90 plus won`t start
Check the data information on the unit there should be a troubleshooting guide that tells you what the two lights blinking once means. hope this helps.good luck. normally found with schematic
SOURCE: When out temp is below 50, heater does not produce enough heat
Sounds to me like the thermostat or thermostat wires are wrong.
If you open the t-stat make sure no bare wires are touching one another.
Typical wire codes/colors are red to R,green to G,yellow to Y,w to white or w1,orange to O,blue to common(C),brow to E.
These should be the same in the air handler as well as the outside condensing unit.
Some installer may use different colors for some other reason.
Verify these colors throughout and report back.
Has the problem existed for the 2.5 years or is it recent?
SOURCE: My furnace comes on and heates the house for about
Make sure filters are clean . if they are stopped up the unit will over heat. Lets start there. Russ
Testimonial: "James, YOU DA MAN!! I would have never guessed the filters could cause these symptoms. Recent carpet cleaning may have added to filter clogs."
SOURCE: My furnace comes on and heates the house for about
There is a limit switch that is likely opening. Be sure your filters are clean and all registers and grilles are open and not obstructed. If the problem continues, you may have a dirty indoor coil or undersized duct work. Some models have a window where you can observe the LED lights. If when the furnace shuts down you see any blinking, you need to count the flashes and we can figure out what the problem is from there.
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