Intermittent Fault

Check the control module connector. Check for contact resistance and oxidation.

Check the flame sensor circuit. Check for an intermittent open-circuit.

Check the cable between control module terminal #8 and the signal terminal for the flame sensor. Check for an intermittent short-circuit to supply voltage.

Remedy as necessary.

Other information: 

• To access the control module or connect the breakout box, see CONNECTING THE BREAKOUT BOX
• To access or replace the flame sensor, see OVERHEAT PROTECTION THERMOSTAT / FLAME SENSOR / ENGINE COOLANT TEMPERATURE SENSOR, REPLACING
• For other values, see SIGNAL SPECIFICATION
• see CHECKING WIRING AND TERMINALS .

Fig 1: Identifying Flame Sensor

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Connector Terminals

Courtesy of VOLVO CARS CORPORATION

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  Refer to INFORMATION