Siemens RAR Photocell C31008H

The Siemens RAR photocell (part number C31008H) is a silicon flame sensor used on oil-fired boiler burners. It monitors the burner flame and signals the control box to confirm that combustion has been established and is being maintained. The RAR 9(1) silicon cell is a service item within the Siemens oil spares range.

• The burner locks out after the ignition sequence even though oil is being delivered and a flame is visible.
• Repeated or intermittent lockouts during running, with no other fault found in the oil supply or ignition circuit.
• The burner fails to establish a flame signal and the control box shuts down on flame failure.
• The photocell window or body is contaminated, sooted or heat-damaged, reducing its ability to read the flame.
• Flame signal readings fall outside the range stated by the manufacturer for the appliance.

• Confirm the appliance model and burner type against the manufacturer's parts list.
• Check the marking on the existing photocell to confirm the RAR 9(1) silicon type is the correct fitment.
• Inspect the photocell lead, plug and holder for damage or contamination before replacing the cell.
• Isolate the electrical supply to the appliance before removing or fitting the photocell.