Controls & Function Switches
Oven and Cooktop Controls NZ: Simmerstats, Selector Switches and Energy Regulators
Most people have never heard of a simmerstat. It's also the reason their cooktop won't turn off, or won't turn on. A small control switch,that’s the reason behind most cooktop problems. Browse controls and function switches for ovens and cooktops across major NZ brands including Westinghouse, Simpson, Electrolux and Fisher & Paykel.
About Oven and Cooktop Controls
Simmerstats, also called energy regulators or infinite switches, control the heat output of each cooktop element. They work by cycling power to the element on and off at a rate set by the knob position. The clicking you hear from a cooktop element is normal and means the simmerstat is working correctly.
Selector switches route power to specific oven functions like grill, fan or light. When a selector switch fails, the function it controls stops working. The oven may still heat on other settings, but the faulty function drops out completely.
These controls are brand and model specific. The shaft size, mounting arrangement, amp rating and wiring layout all need to match the original part. Always confirm your model number before ordering. If you are not sure which control fits your appliance, the parts lists and diagrams page has exploded views that help identify the right part, or search by model to narrow it down.
Signs Your Oven or Cooktop Needs a New Control
- One element will not turn off, or stays on maximum heat regardless of the knob position. This is a safety issue and the element should not be used until the simmerstat is replaced.
- Element only works on certain settings. A simmerstat can fail at a specific position while still working at others.
- Oven grill, fan or bake not working on a specific selector position. The selector switch routes power to that function. When it fails on one position, that function stops working while others may still run.
- Knob feels loose, spins freely, or is physically broken. A stripped shaft or broken knob fitting means the control cannot be adjusted. Check if the knob or the switch itself is the problem before ordering.
- Oven not maintaining temperature or running hotter or cooler than the dial setting. The oven thermostat is the likely cause here, not the selector switch.
How to Find the Right Control or Switch
Controls must match the original part. The shaft diameter, amp rating and mounting arrangement all need to be correct. A universal simmerstat can work across many brands but the specifications still need to match. Do not order based on appearance alone.
If the part number is printed on the old control, search that directly. If not, the parts lists and diagrams page has exploded views of many common NZ oven and cooktop models. You can also search by model to find controls matched to your appliance.
Not sure which control has failed or which part to order? Send us the model number and a description of what the oven or cooktop is doing. We will point you to the right part.
Related Parts Collections
Cannot find the control or switch you need? Send us the model number or a photo of the old part and we will track it down.
Why Buy from Appliance Spares NZ
- NZ owned and based. Parts dispatched from our Palmerston North warehouse.
- Genuine and quality compatible parts. We stock what fits the appliance, not just what is easy to source.
- Real advice. Send us your model number and the fault and we will point you to the right part.
- Fast delivery across New Zealand with NZ Post and NZ Couriers.
- Unused parts can be returned within 30 days. No hassle.
Frequently Asked Questions
My cooktop element will not turn off. Is it the simmerstat?
Almost certainly. A simmerstat that fails closed keeps power flowing to the element regardless of the knob position. Do not use that element until the simmerstat is replaced. This is a safety issue.
The clicking from my cooktop has stopped. Is that a problem?
The clicking is the simmerstat cycling power on and off. If it has stopped and the element is now stuck on maximum or not heating at all, the simmerstat has failed. If the element still heats normally just without the clicking, it is worth monitoring but may not need immediate attention.
Can I replace a simmerstat myself?
Under NZ rules, work on hardwired 240V appliances must be carried out by a licensed electrician or qualified appliance technician. A simmerstat replacement involves working inside the cooktop with mains voltage components. Do not attempt it yourself unless you hold the relevant licence.
How do I know if it is the simmerstat or the element that has failed?
If the element heats on some settings but not others, the simmerstat is the likely cause. If the element does not heat on any setting, it could be either. A qualified technician can test both with a multimeter in a few minutes to confirm which part has failed before you order.
What is your returns policy?
Unused parts in original condition can be returned within 30 days for a full refund. Full details are in our returns policy.