This study presents an in-depth evaluation of flame stability in rice husk stoves, focusing on the critical role of equivalence ratios in preventing combustion instabilities such as flashback and blowoff. The research investigates the behavior of the flame over a range of equivalence ratios (φ) from 0.5 to 1.6, identifying the flame stability window essential for efficient and safe stove operation. Experimental data revealed that stable combustion occurs between φ = 0.8 and φ = 1.4, with airflow rates ranging from 61 to 107 L/min. Outside this range, flashback was observed at φ = 0.5, with an airflow rate of 38 L/min, where the flame propagated backward toward the fuel inlet, risking operational safety and efficiency. Blowoff occurred at φ = 1.6, at 120 L/min airflow, with the flame lifting off from the burner, leading to incomplete combustion and flame extinction.