I am working on an older reehm furnace a corsaire.
I replaced the main control board. the control light stays green. the yellow dose not light up. the burners come on as they should but the whole thing shuts down after about 15 seconds. I have all the right voltage in the right places and all the safty controls check out to be good. the two fan motors run also. the ignighters are both in good shape and glow. I cant figure out why it wont stay lit. Have I overlooked somthing? any Ideas?
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Sounds like back-light inverter fault. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
After replacing the main board, the firmware should be updated. Contact the authorized service centre for Sony. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
62-24084-02 LED CODES
POWER LED - GREEN
ON - Normal
OFF - No power to board
OK LED - GREEN
One Blink - One hour retry delay
Two Blinks - Pressure switch failure (remains open)
Three Blinks - Limit switch fault
Four Blinks - Pressure switch failure (remains closed)
Five Blinks - Twinning fault
FLAME LED - YELLOW
ON - Good flame
Rapid Blink - Flame present with gas valve de-energizing
Slow Blink - Marginal flame
If the sensor does not I.D. a pilot, the furnace would not fire, so your OK to this point. The sensor needs to stay in a flame constantly once the main burners light. Sometimes the draft will cause the flame to waver and cause a shutdown. Also, if the blower fan does not start on time, the furnace will shut down. I would check for wavering first.
I'm assuming this is a remote sensor... if so, you need to read the MicroAmps that the flame is generating. If it is anything less than 4, then either the flame is not hitting the sensor enough, or the sensor needs replaced.
I am not aquainted with the Bosch..... But it is a heater. I am going from past experience with gas furnaces and how the process works..... You said that you can get the pilot to stay on if you unhook the Main Gas Valve wire. Do you have 24 Volt power on that wire to Common? Does this have a Flame Sensor? Maybe it got damaged. Does it have a good ground from the burner to the ignition control module? Does that wire to the electro valve go into a plug that plugs into the ignition control.... Maybe that pin is not making contact to the board. Hope this helps If no one else answer right away repost Or call and see if you can get Tech support from Bosch..... I know how frustrating it is you buy something brand new and it doesn't work
All gas furnaces have a fan control of some sort. Either a mechanical fan control where there is a temperature probe that reaches into the heat exchanger compartment thru a hole in the panel that separates the control part of the furnace(this would be the front of the furnace where all the controls are) from the heat exchanger. This type of control is either a small black plastic control about 4 inches by 2 inches and about 1 1/2 inches thick secured to the panel with 2 screws. Or it is a slightly larger silver colored control that should have a pull off cover. It may say Honeywell on it. Either way the control will need replacing. The other type of fan control is a solid state control board. This will most likely be located in the indoor fan compartment. It should be located under a covered control box. The box with all the wires going into it. This board will also need to be replaced if your furnace uses this type of fan control. You will need to bring your furnace model and serial number to a dealer that sells your brand of furnace or go online to a parts dealer that carries parts for your furnace. Hope I was of help to you! Good luck!