Yellow light comes on to heat water, but does not change to green

On Rancilio coffee machines, the meaning of the green and orange lights can vary depending on the specific model and configuration of the machine. However, in many Rancilio espresso machines, the lights are used to indicate certain states of the machine during operation. Here are some common interpretations for the green and orange lights:

1. Green Light: The green light on a Rancilio coffee machine typically indicates that the machine is powered on and ready for operation. When you turn on the machine, the green light should illuminate to show that it has power.
2. Orange Light: The orange light often indicates that the machine is in the process of heating water to the optimal brewing temperature. Once the water reaches the correct temperature, the orange light may turn off, and the machine is ready for brewing.
3. Blinking Orange Light: A blinking or flashing orange light might signify that the machine is in a heating phase, and the water is being heated to reach the appropriate temperature. This is common during the initial warm-up or after the machine has been idle for a while.
4. Red Light: Some Rancilio machines might use a red light to indicate specific alerts or warnings, such as low water level, need for maintenance, or other issues

in the machine there is small circuit board that control the machine so they programmed that circuit to preheat the heating element for about 30s if this failed the red light flashes two tims then stops so you have to change the circuit board

one or your tv mainboard was crashed, change it with new one

You can fix it yourself. The CPU was to hot and the solder has come off. Bad part is the solder is under the CPU and must be heated up. It is lead free so it needs more heat then lead and you need to add flux. I would start by getting the board out. Remove the thermal paste off the CPU. Add flux with a flux pen. You want to get the flux under the CPU so you might want to tip it on its side. After you have a good amount of flux under the CPU you want to start to heat the parts around the CPU. I would use a heat gun with temp. settings. You first want to heat around the CPU to keep solder on the other parts from cracking. You dont want to over heat the parts. After you preheat the board you want to heat the CPU. It needs to be around 400 or 500 degs f. a good 15 or 30 sec. keep moving the heat gun. After heating the CPU you want to start the cool down. Same as warming up the board but you want the board to cool down slow. After all this you want to add New thermal paste to the CPU. This helps transfer from the CPU. This is a must because your PS3 is overheating as it is. After you do all this some people say it only works for 2 to 6 weeks. Its all on how you fix the board and how good of a job you did. I would back up your hard drive. Then hope for the best!! good luck and i hope this helps you out.

Sounds like a RAM problem. Go to the back of the machine, You will see  2 large, thumb Screws, Twist them about half a turn and remove the main board. Remove and reinsert the memory stick. If that does not fix it the main board or the electronics module has probably failed.

Hi
I would check the level probes on top of the boiler. There is a yellow wire going to the high level( left) and a green wire going to the low (right) probe. The probes get scaled and do not sense water. If there is no sensing of the right probe ( low water) it will not heat. They both need to be cleaned. There is a nut or a big nut that will allow for the removal. Clean both probes and it should go back to normal.

This is the yellow light of death i got it some time ago and had to buy a new ps3 there is a way to fix it but i costs more than a new ps3 i had to buy a new one so your screw lol.

ps3 . when i turn it on the green light comes on then goes flashes yellow then goes red and will not come on

You can't manually reset. The machine will have to do it. I had the same problem, two green flashing lights with one red (water) all 3 would just keep flashing and not turn solid. No coffee can be made or hot water. I could not pump prime. The problem was the steam wand was blocked with old milk residue. It needs unblocking or you will never pump prime. I could not unscrew the steam wand...so I let it sink in a glass full of hot water for a few minutes and then turned the water knob counter clockwise to push out the softened residue. After that, everything was good. When water started flowing out of the steam wand, the red light turned off and the green lights turned solid. The obvious answer to why you can't pump prime is there is a blockage somewhere and best to start with the steam wand. --Mabada

Emachines are bad for having failed power supplies and motherboards. Test your power supply, watch this video.
http://www.metacafe.com/watch/729606/how_to_test_your_computers_power_supply_psu/