577620 Genuine Coaxial Thermocouple 350mm Type 213 for Fisher & Paykel Gas Cooktops, Burner Flame Failure Safety Device

With a 350mm lead and the type 213 reference, 577620 is a genuine Fisher & Paykel coaxial thermocouple for gas burners. It's part of the flame failure system that cuts the gas if the flame goes out. Fisher & Paykel uses a range of similar thermocouples, so compare the length, type and connector on your old one. Without a model list on file, send your model number through the parts enquiry form if you want it double checked.

Gas burner keeps going out

Flame failure protection relies on the thermocouple. Heated by the flame, its tip produces enough current to hold the gas valve's safety magnet open. Once the flame is gone, the current drops away and the valve closes. Common signs of a failing thermocouple are a burner you have to hold in for a long time before it stays on, a flame that drops out on low, or a burner that won't stay lit at all. Coaxial types have the conductor running inside the outer sheath, so the lead looks like a single solid tube.

Part details

• Genuine Fisher & Paykel part 577620
• Coaxial thermocouple
• 350mm length
• Type 213
• Flame failure safety part, fitted by a licensed gas fitter

Changing the thermocouple

A licensed gas fitter should replace thermocouples, with the gas turned off at the isolation valve and the power off at the wall. Remove the burner parts, undo the nut at the valve and release the tip from its bracket. Fit the new one so its tip sits in the flame exactly where the old one did, then test the safety cut-off.

Questions about this part

How do I know it's the thermocouple and not the valve?

A gas fitter can test the thermocouple's output with a multimeter while it's heated. If the output is good and the burner still won't stay on, the magnet unit in the valve is the more likely fault.