Call pilot 100 will not release the line - NorStar CallPilot 100

no model told , not even makers name.

but modern have a flame sensor ,bad.
it needs service, call for service.

Sounds like its the thermocouple or pilot needs cleaning

You will not be able to blow through a gas valve when it's disconnected. You may have air in the lines which would cause the pilot to go off when knob is released if not held in long enough. Try lighting again. Once the pilot lights - hold knob in for 5 minutes then release. Try twice, if pilot will not stay lit it's probably the thermal coupler. (metal prong right next to flame of pilot burner.)

turn gas off and clean out all lines going from gas valve to pilot with compressed air. put the lines back together (be sure they seal)
try the pilot again

do you have the pilot light burning if not then you have to get in burning first
Put knob in pilot position push down and hold for at least 30 seconds or longer then if there is an igniter push and release it push and release till pilot light comes on .Continue to hold pilot light button down for another 10 seconds or so, release pilot button and turn button to on or up a number or set T stat
Main flame should come on and burn

Clean pilot may be too small blow out with tube or air line , thermocouple not working try changing it

Remove front cover,or just lower section if you can. they usually just need to be lifted up about an inch or so and pulled out. However some have covers that snap in place. After you remove cover locate gas valve. It should have a control knob on top with markings for on, off, and pilot. Set control to pilot. Follow lines from gas valve to burner compartment, one goes to main burner one ,small copper colored line is the thermocouple, other line is the pilot. Turn thermostat down as far as it will go. Make sure gas supply valve in line to heater is on and then depress pilot control , when you have pilot control depressed have a match or other small flame source close to pilot assembly. If it lights then hold down on pilot control for a couple of mins. Slowly release pilot control and if it stays lit turn gas control to on. Turn thermostat up to call for heat and burner should light. If pilot doesn't stay lit when you release pilot control then try again holding pilot down longer. If it still won't stay lit then thermocouple will need replace. Good luck. Thanks

i would suspect defective thermopile or obsruction in pilot assembly that prevents pilot flame from hitting thermopile . check pilot flame characteristics, should be blue and stiff.if it is yellowish that would indicate blockage.use multimeter to determine voltage output. you need about 100mv to maintain pilot and around 400mv to operate control valve

You need to bled the line longer and when you get lited hold down for a good minute.When the gas gave out ,there could trash in the line.I would take the line off and blow gas through it undtil you can smell it.

Are you getting the pilot light to work? some gas valves are finicky about where the knob is positioned when trying to light the pilot.