Have been having issues with the compressor running a long time, and often, with an occasional ‘normal height only’ fault. The run time and fault frequency has increased and was able to pin it down to code C1A20. Ran live data but it shows strong gallery pressure (250psi) although it does get hot pretty quick. Know this code often means compressor going to crap but the good gallery pressure raised a flag. Replaced the dryer back in the spring and the old dryer material was in bad shape. Have also checked for any leaks at air springs, valve blocks and compressor. Truck doesn’t drop overnight either. Anything else worth investigating before I pull the trigger on a compressor? Clogged valve block, compressor filter or air line?
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