540039 Genuine Thermal Limiter 140°C Campini TY60 NC for Fisher & Paykel Ovens, F&P Oven Safety Cut Out Normally Closed

540039 is a genuine Fisher & Paykel thermal limiter, a Campini TY60 type with a 140°C rating and normally closed contacts. It's a safety device in F&P ovens that breaks the circuit if the area it monitors gets hotter than it should. Our records don't list which oven models use it, so compare the markings on your old limiter, or look up 540039 on your oven's parts diagram.

Oven cutting out or not heating, check the limiter

A normally closed limiter lets current flow until its set temperature is reached, then opens to cut power. In an oven it guards against overheating, for example if a cooling fan stops or a thermostat sticks. When a limiter trips or fails open, the oven may stop heating part way through cooking, refuse to heat at all, or lose some functions while the lights and fan still work. A limiter that trips repeatedly is often reacting to another fault, so find out why it opened before replacing it.

Part details

• Genuine Fisher & Paykel part 540039
• Thermal limiter, Campini TY60 type
• Rated 140°C
• Normally closed contacts
• For Fisher & Paykel ovens, models not on record

Testing and replacing the limiter

Isolate the oven at the circuit breaker before removing any panels. Many built-in ovens are hard wired, and in that case a licensed electrician should handle the work. With power off, a limiter in good order reads continuity across its terminals at room temperature. Fit the new one firmly against its mounting surface so it senses heat properly, and check the cooling fan works before using the oven.

Questions about this part

Can I bypass the limiter to get the oven working?

No. The limiter is there to stop the oven overheating, and bypassing it creates a real fire risk. Replace it with the correct 140°C part and find out what caused it to open, such as a failed cooling fan.