руководство по эксплуатации газовой духовки - GI 438 W

: The oven can be ignited using the built-in electric ignition or matches. Press and turn the control knob to the maximum position and hold it for several seconds to allow the safety thermocouple to heat up and maintain the flame.

: If your unit features a digital display, an F4 code typically indicates a fault with the temperature sensor or thermistor.