I have a RobinAir Digital Micron Vacuum Gauge. It worked just fine two months ago. I just tried to use it today. It has new batteries and starts up just fine. When I start it up it goes through the 10 second countdown and then displays -30.000 inHg (the other units all read 0). When I try to pull a vacuum test using a hose directly from the pump to the gauge (my connections are tight and have teflon tape), the gauge doesnt change at all--it still reads -30.000 inHg, 0.000mbar, 0.000mmHg, 0.000Pa,0.000torr and 0 micron. Any ideas why this might be happening? Thanks very much!
source https://hvac-talk.com/vbb/showthread.php?2222296-Robinair-Micron-Vacuum-Gauge-Not-Working&goto=newpost
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