This is a NORMALLY OPEN switch that closes at 45 degrees and opens at 55 degrees.
#FLASHCODE LOGIN CODE#
Flash code 9 on the boards is a summary of heating section faults. Indicates no 24vac at the GV terminal of the board during a call for heat or no 24vac at the limit terminal anytime the board is energized.This fault code basically says there is a problem in the heating section. FC 9 – Ignition control lockout or heating failure.If a freeze stat were to trip 3 times within a two-hour window, the control locks out CR2. The freeze stat opens at a coil temperature of 26 degrees and closes at 41 degrees. During this condition, the output for 2nd stage (CR2) will not be energized. During this condition, the output for 1st stage (CR1) will not be energized. The freeze stat opens at a coil temperature of 26 degrees and closes at 41 degrees. If a freeze stat were to trip 3 times within a two-hour window, the control locks out CR1. If the pressure switch trips 3 times within a one hour window, the control locks out CR2. The pressure switch will open at 7 PSIG and close at 22 PSIG on R-22 units and open at 50 PSIG and close at 70 PSIG on R-410A units. FC 6 – Low pressure switch trip or lockout on 2nd stage.If the pressure switch trips 3 times within a one hour window, the control locks out CR1. During this condition, the output for 1st stage (CR1) will not be energized. FC 5 – Low pressure switch trip or lockout on 1st stage.
The pressure switch will open at 380 PSIG and close at 300 PSIG on an R-22 unit and open at 625 and close ar 500 PSIG on R-410A units If the pressure switch trips 3 times within a two-hour window, the output for 2nd stage (CR2) will not be energized.
FC 4 – High pressure switch trip or lockout on 2nd stage.The pressure switch will open at 380 PSIG and close at 300 PSIG on an R-22 unit and open at 625 and close ar 500 PSIG on R-410A units If the pressure switch trips 3 times within a two hour window, the control locks out CR1. FC 3 – High pressure switch trip or lockout on 1st stage.This can be by-passed for one cycle by pushing the test reset button on the board. This code is not considered an alarm, but flash code to alert the technician the control is waiting for a compressor anti- short cycling delay to expire. FC 2 – Indicates the anti-short cycle delay (ASCD), for either stage 1 or stage 2 is active.This could be due to no power or a shut down circuit. NOTE: An LED that is not lit may be an indication that the board is not energized. If the condition does not correct itself after cycling power to the board, it must be replaced. Steady On LED – A steady on LED, or an LED that does not light at all when power is applied, indicates a possibly defective board.You still need to make the diagnostic based of the flash code. Remember - the flash code is not telling you want is wrong but is looking at symptoms.
Hopefully this will help guide you to understanding what each code means and assist you in making proper diagnostics. To make these flash codes more understandable in our commercial equipment - below is an explanation of each flash code. In some of my previous posts, I’ve discussed “flash code diagnostics” and the fact that these should be used as a “guide” to finding out where the problem is located.
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