i have the dyno tune bottle heater. . i turned it on with no pressure and it heats up very fast but when i open the bottle it doesnt turn on i moved the screw all the way to the top and then all the way tight. . nothing. .even let it sit there maybe it took time to read the pressure. .bottle was at 900 psi please help is it a bad pressure switch or what. !@!

 

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If you have turned the screw to both ends of it's travel when under presure and you can't hear the relay click on you must have a bad pressure switch.