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In an electric fan oven when cooking a specific recipe at a given temperature should that oven reach that temperature given the 20deg. difference between that and a conventional oven? I bought an oven thermometer placed it in the Fan oven and set the oven at 170deg C. the thermometer only reached 140deg. C. is my oven faulty?

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Yes, it sounds like your oven is faulty. Or at least that the thermostat is wildly off. It's not uncommon for thermostats to be 10-20°C off, but 30°C seems like too much.

(On the other hand, how much do you trust your thermometer?)

  • There's also a good chance that the oven temperature sensor is in a location that is not ideal for determining the true temperature of the oven. Perhaps the sensor is in sheltered area which gets hotter than the rest of the oven, or is not positioned roughly in the middle of the oven. – bob1 Feb 26 at 22:34
  • I have frequently enough seen ovens to go 30 and even 40 Celsius off. It is a common thing, and I don't know if a manufacturer would accept a claim of "faulty" when it happens, but it is something many people live with without a problem. – rumtscho Feb 27 at 18:21
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You also have to consider how long the oven had to warm up (when the light goes off it may not be evenly warmed up, though this should be better in a fan oven) and whether you had to open the door an let cold air in to read the thermometer.

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