I have a Cedar ridge Vent-Free gas fire Place insert 0328248 i have a pilot light but will not click on to heat ??? changed batteries still will not click on only used about 3 months

SOURCE: Pilot light lit but no heat

the pilot's millivolt generator may be at fault.  if you have a meter that is capable of measuring a very small DC voltage, connect it up to the very end of the thermocouple and the copper cappillary. the thermocouple has a welded bead at the very end inside that generates a small DC voltage. Same principle of a J-K thermocouple. Iron constintan  - two dissimiller metals where joined together produce a voltage when heated.  the thermocouple actuates a millivolt electromagnet inside the valve to keep the valve pellet open.  no voltage there it won't actuate the electromagnet.

SOURCE: Comfort Glow Vent-free Gas Heater CGN18B

Check with Ebay seller s.a.w.inc for available thermocouples. If that doesn't solve the problem the valve unit will likely need replaced.

SOURCE: pilot lit clicking noise no burner

make sure knob on gas valve(inside heater)is turned to on position.3/4" should be fine as long as heater is not larger than than 175,000 btu

SOURCE: Tappan gas range electric pilots will not light

The gas line in your Tappan could be closed or
stucked up. Have it check.

SOURCE: Pilot on logs won't stay lit

Hold pilot button longer. if this doesn't work your Thermopile has gone bad and will not generate enough Millivolts to keep gas valve pilot open. A new thermopile will generate 750 millivolts. It cost less than $20 dollars but is difficult to replace. You should call a certified technician. They will charge you about $100.00