GX CS4-I shutting off

My CS4 has been great for the last year. But I have only been using it to fill guns. I recently acquired an SCBA tank and since I started filling the tank, the compressor will shut off. I don’t know if it is some kind of fault protection but when I try to press the start button again it won’t start. If I relieve all of the pressure allow the fan to run and cool it down and unplug it and let it sit for a few minutes and plug it back in everything works fine. I am usually running it for 30 to 45 minutes when topping off the SCBA. Also it won’t fill the bottle past 4200 psi. Fills tubes and bottles on guns to 4500 no problem but just can’t seem to get that number on the SCBA.
 
You might have an issue with the circuit board. I remember reading some time back that GX had issues with a specific lot of circuit boards and the symptoms, if memory serves, were similar to what you have described. Send Bill at TargetForge an email ( https://targetforge.net/contact-us ) or reach out to GX directly and find out what they can offer ( https://gxpumpofficial.com/pages/contact-us ).
 
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