Flame monitor, value

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Measurement range: 0-5 V.

Reading out flame monitor's voltage.

The flame monitor registers the light intensity in the heater and is used to detect if there is a flame or not. The lower the light intensity that the flame monitor detects, the higher the voltage to the control module. The higher the light intensity that is registered, the lower the voltage.

The following applies when the control module uses the signal from the flame monitor to decide if there is a flame or not:

If voltage is higher than approx. 2.5 V for a certain time, the control module considers that there is no flame.
If voltage is lower than approx. 2.5 V for a certain time, the control module considers that there is a flame.