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FLAME SENSOR FLASH

FLASHING FLAME SENSOR CODE, HAS NEW BOARD AND SENSOR ON IT.

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A flame sensor simply "senses" a DC rectified signal from the AC spark being passed through a flame(the pilot) thus proving a pilot flame exists via "flame rectification" and its just microamps as the fire isnt a good conductor, but it will conduct enough for this use, try wiring some 105 degree celcius wire from the pilot assembly to the ground or sense on the ignition module, flame sensors do not go bad or wear out, they get dirty, but that is never the issue from my experience, sensing the DC via
ground or ground rod/sensor is easily disrupted by corosion even moisture.There are flame simulators to test with as well.

Posted on Oct 31, 2012

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SOURCE: MY ADP GARAGE HEATER MODEL CUHN-75A-1 FLASHES CODE

dirty flame sensor try cleaning it or there is air in the line

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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.

Posted on Mar 08, 2011

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1 Answer

Hi :) I have the Trane Furnace that just turn on


on older tranes if 120v power is reversed it would do that try switching leads on pigtail to board. make sure to unplug first!

Oct 31, 2013 | American Standard Trane Ge Gas Furnace...

1 Answer

The blower is running and the T-stat is turn down to 50. Its a hot air furnace only no a/c. The red light is flashing on the white rodgers control bord. The code for it is flame no call for heat.


The circuit board thinks the furnace is running when it isnt supposed to. Check your flame sensor its a rod that senses the flames when they are lit clean it and also make sure it didnt get wet or is touching anything metal except for the porcelin. If that dont work you need a new circuit board. Let me know what happens

Sep 15, 2011 | Heating & Cooling

1 Answer

Hi, the lights on my circiut board are flashing the one on the left is on all the time and the one to the right of it flashes two times and then waits and then flashes two times again


Error Codes
A green LED indicates system faults
Steady On: System OK
Steady OFF: Board control fault or no power applied
1 Flash: Ignition failure (control in one-hour lockout)
2 Flashes: Pressure switch fault, fails open (switch is
stuck open)
3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
stuck closed)
A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
increases

hope this is helpful.

Dec 21, 2010 | Ruud Central System Air Conditioner

1 Answer

Meaning of rudd furnace trouble codes


Error Codes
A green LED indicates system faults
Steady On: System OK
Steady OFF: Board control fault or no power applied
1 Flash: Ignition failure (control in one-hour lockout)
2 Flashes: Pressure switch fault, fails open (switch is
stuck open)
3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
stuck closed)
A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
increases

Dec 12, 2009 | Heating & Cooling

2 Answers

Four flashes on Goodman GDS80904BX circuit board


I have this clunker-4 flashes is an open high limit code according to the wiring diagram and fault code sheet. the common denomonator for this furnaces problems is the circuit board. Always flashing 3, 4, 7 times most of the time having nothing to do with the problem. The actual problem is the board it's self. take it off the mounts (POWER OFF FIRST AND SWITCH OFF>)
remove from the 4 mounts one at a time then check the back of the board. you will probably notice brown spots on the green. this is where the board has burned up. replace the board and you will be fine, you will also be the 100th person I know to have this problem. Make sure you take a picture of the board before you take all the wires off so you can put them back properly. I personally have replaced the board twice the first replacement I purchased (warranty) was made by the same company as the original, the second board I replaced 1 year later with a new board made by a new manufacturer. they obviously knew there was a problem.

http://hphotos-snc3.fbcdn.net/hs066.snc3/13331_1198507328519_1403584043_30566732_3667503_n.jpg

this is a picture of a board another fixya user sent me today after he had the same problem as you and I told him what to look for. look familliar?

Nov 30, 2009 | Goodman GDS80904BNA Open Flame Heater

1 Answer

I have a furnace that flashes the code 3 it is a Intertherm Furnace


The flame sensor ( a rod in the flame usually right at the burner) is not telling the control board a flame is present. Take it off, and clean it with steel wool. If that doesn't help, you'll need to replace it.

Nov 01, 2009 | Heating & Cooling

1 Answer

Turn on green light flashes


Count the flashes before a pause. A steady on is bad ground or loose igniter. 2 flashes is either low gas pressure, bad flame sensor, gas valve wires loose or bad ignitor. 3 flashes is a bad pressure switch, or blocked vent. 4 flashes is a bad roll-out switch or open contact. 5 flashes is bad wiring to gas valve or flame sensor, 6 flashes is either a bad control board or bad thermostat.

Oct 13, 2009 | Sterling RF75 Natural Gas Heater (75,000...

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