Flame monitor
Check the water circulation. Check the check valve in the coolant circuit. Check water hoses and connections. Check that there is no air in the cooling system. Check the thermostat. Check the water valve. Check the fuel supply. Check the water pump. Measuring points 3 and 6 in the connector for the auxiliary heater control unit. Resistance value: 4 ohms Check the dosage pump. Measuring points 1 and 2 on dosage pump V41. Resistance: 20 ohms Check the flame monitor. Measuring points 15 and 16 in the connector for the auxiliary heater control unit. Resistance value: 650 kohm at -25 °C 1100 kohm at +25 °C
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The flame monitor has detected a temperature of more than 700°C or has exceeded its tolerance limits.
Poor water circulation or fault in the flame monitor.