Checking Components And Wiring
Check the cable between control module terminal #4 and the ground terminal for the flame sensor. Check for an open-circuit.
HINT: It is difficult to differentiate between the flame sensor cables so take readings between control module terminal #4 and both flame sensor cables.
Check the cable between control module terminal #8 and the positive terminal for the flame sensor. Check for an open-circuit. Check for a short-circuit to supply voltage.
HINT: It is difficult to differentiate between the cables to the flame sensor. Take readings on the cables one at a time and, see if a relevant value was obtained from either of them.
If no fault is found in the connectors or cables, try a new flame sensor.
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 .
- Continue
Refer to VERIFICATION