A few weeks ago I called an engineer out to look at my gas cooker (EOG6000W - no 949712283) which was covered by an Electrolux warranty. The cooker was not heating up correctly and they changed the burner at the bottom to correct this. Unfortunately the problem has not been cured. The flame is now very small even on full power setting and does not seem to increase or decrease when the temperature control is turned. Could anyone tell me if this model is fitted with a Flame Failure Device, as I am told this could be the cause, other than that could the thermostat or thermocouple affect the flame this way?