Checked high limit n roll out switches all good pressure switch good as well.
SOURCE: I 've got an Intertherm G3RA-072A-13. It has a
You have a limit switch open. See if you can see any little button switches with 2 wires going to it, check all these for continuity
SOURCE: TROUBLE REPLACING OEM TIMER - UNIVERSAL ELECTRONIC FAN TIMER
Hi, you should be real close with the universal timer and the factory OEM. On the new control board, if you have 24 volts to the board, you should have 24 volts from R to ground or to Common. I know that on most all control boards the voltage in is 120volts as you will have terminals for L-1 and L-2 to run the high voltage controls from the board and all of the thermostat control terminals in a row, R,G,Y, W, C, and so on are 24 volts. 120 volts is stepped down to 24volts control and you say you have nothing out. Make sure you have 120volts in. You are calling this a timer board, is this a heat-pump defrost board with the 3 settings and pin to defrost the unit at 30,60,and 90 minute times? This is what it sounds like. If all was terminated per diagram, you would have the 24 volts required to fire this unit. These defrost timer boards require high voltage to them as well. Even though the board is a new board and you know for a fact that it is wired properly, it may be a defective board. I have seen this many times in my years as a tech. I have shorted new boards out by static electricity and by mis- wiring one. You can kill power and look at the back side of the board to see if this has happened. Sometimes you will find that they missed a solder point on the back side not completing a circuit through the board. To give you more ideas, I would need to see the diagram, or if you could send me the model, serial, and name of your unit. The board number would help also. Check out what I have said and get back to me on this. I will wait to hear.
Shastalaker7
SOURCE: Gas furnace with Honeywell smart valve code error
Hello, it sounds like your Furnace might be shutting off due to your high limit switch.A limit switch will open when the furnace overheats due to low airflow, . check air filter, clean blower wheel, and check to make sure the blower wheel is running at proper speed and not dragging sometimes cause by a weak capacitor. Anything that restricts airflow will cause a limit switch to open.
SOURCE: no power to gas valve
Have you checked the wires from the board to the gas valve? You should get 24 volts after igniter glows.
Testimonial: "Found out I have a craked heat exchanger which melted a wire to the limit swith! I was testing the furnace not being hooked up to the duct work which worked fine after I repaired the burt wire, but when I hooked it to the ductwork that is when the cracked exchanger became evident!"
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