Some have a little selsyn motor inside that turns a screen across the elements mimicking flame movement. if this type, you may have to free the little drum or oil the motor to get it to move again.
Some use an electronic circuit to flicker some neon (or similar) lamps behind the screen. Sometimes this little circuit fails stopping the flicker. If this is the case, replacing that board will likely exceed the cost of a new unit.
some have a little turbine type fan over the lightbub that turns with the heat of the lightbub (hot air rises)
these can get stuck, (dont use oil), or you may be using a lightbulb of a type which doesnt produce enough heat to turn the flickering fan (energy saving bulb = low heat)
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Which type?
Some have a little selsyn motor inside that turns a screen across the elements mimicking flame movement. if this type, you may have to free the little drum or oil the motor to get it to move again.
Some use an electronic circuit to flicker some neon (or similar) lamps behind the screen. Sometimes this little circuit fails stopping the flicker. If this is the case, replacing that board will likely exceed the cost of a new unit.
some have a little turbine type fan over the lightbub that turns with the heat of the lightbub (hot air rises)
these can get stuck, (dont use oil), or you may be using a lightbulb of a type which doesnt produce enough heat to turn the flickering fan (energy saving bulb = low heat)