574336 Genuine Oven Thermostat 20 to 262°C for Fisher & Paykel, Haier Ovens OB60BCEX3 OB60DDEX3 OB60B77CEX3 OB60BDEX3 OB90S4LEX3 HWO90S4MX1

Burnt edges at normal settings, or a roast that takes forever, point to an oven that isn't holding the temperature you set. Part 574336 is the genuine Fisher & Paykel oven thermostat with a 20 to 262°C range. It suits the OB60B77, OB60BCE, OB60BDE and OB60DDE ranges, the OB90S4LEX1 to X3, and the Haier HWO90S4MX1. It's also referenced for Elba ovens, so match the number on your old thermostat.

Oven running too hot or too cold? Test the thermostat

The thermostat works with the temperature control to sense the heat inside the cavity and switch the elements on and off, holding the setting you've chosen. When it drifts, the oven may overshoot and burn food, never reach temperature, or cycle so slowly that cooking times blow out. A thermostat that fails completely can leave the elements off altogether or, less often, stuck on. An inexpensive oven thermometer is an easy way to compare the real temperature with the dial before ordering.

Part details

• Genuine Fisher & Paykel part 574336
• Temperature range 20 to 262°C
• Suits Fisher & Paykel OB60 and OB90 ovens on file
• Also on file for the Haier HWO90S4MX1

Replacing the oven thermostat

Switch the oven off at the isolator or circuit breaker, and have a licensed electrician or qualified technician do the job if the oven is hard-wired. Pull the knob off and photograph the wiring on the old thermostat. If it has a sensing bulb inside the cavity, note how it's clipped in and route the new line the same way without kinking it. Refit the knob and check the oven with a thermometer.

Questions about this part

How do I know it's the thermostat and not the element?

If the elements heat but the oven overshoots or undershoots the setting, the thermostat is the likely fault. If an element never warms up at all, check the element first. A technician can test both with a multimeter.