578058 Genuine Function Encoder Module for Fisher & Paykel OR90 Freestanding Cookers, Oven Function Selector Knob Encoder

This genuine Fisher & Paykel module, 578058, is the encoder for the oven function knob on OR90 freestanding cookers. Turn the knob and the encoder tells the control electronics which cooking function you've picked. The OR90 uses a second encoder for the temperature knob, numbered 578057, and the two are not interchangeable, so make sure it's the function side that's playing up before you order 578058.

OR90 oven not responding to the function knob

Unlike an old style rotary switch, an encoder doesn't carry the heating load itself. It reads the position and direction of the knob and passes that to the control board, which then switches the elements, fan and light. When an encoder wears or gets contaminated, the oven may skip settings, jump between functions, select the wrong mode or ignore the knob in certain positions. Before replacing it, check the knob and its spindle aren't cracked or slipping, since a split knob can give similar symptoms.

Part details

• Genuine Fisher & Paykel part 578058
• Function selector encoder module
• For OR90 freestanding cookers
• Temperature encoder is a separate part, 578057

Swapping the encoder module

Turn the cooker off at the isolating switch or circuit breaker, and shut off the gas on gas or dual fuel models. Hard-wired cookers should be worked on by a licensed electrician. Pull off the function knob, take photos of each plug on the encoder, then transfer the connections to the new module one at a time. Refit the knob and step through every function to check the display and oven respond.

Questions about this part

How do I know it's the function encoder and not the temperature one?

Look at which knob is misbehaving. If the oven won't select or hold the right cooking function, it's this part, 578058. If the problem is setting the temperature, the matching part is 578057. The model number is on the rating plate, often visible with the oven door open.