Poor pilot flame?
Gas pressure issue?
Faulty valve?
Airflow issue?
Improperly installed THERMOCOUPLE? (note the correct spelling)
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Few here would know anything about gas fire places (myself included), so can’t advise. Within the scope of gas-fired equipment, we just do commercial cooking equipment and commercial dishwashers here.  Not residential fire places.
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My best advice is that you call a company that services gas fire places.
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