Thetford Oven Problems

Thetford ovens, especially the Thetford Midi Mk 3 and Thetford Midi Prima 3 models, are popular choices for many caravan enthusiasts. However, as with any appliance, issues can arise over time. One of the common problems faced by users is the oven not staying alight when the control knob is released. Below, we delve into this issue and offer potential solutions based on shared experiences.

The Problem:

Many users have reported that their Thetford oven, specifically the Midi Mk 3, doesn’t stay alight once the control knob is released, making the oven practically unusable. This not only disrupts cooking but also raises safety concerns.

Potential Solutions:

  1. Flame Failure Device (FFD):
    • Central to the problem seems to be a device known as the Flame Failure Device (FFD) or thermoelectric flame failure device.
    • The FFD, located behind the control knob, is connected to a thermocouple. This thermocouple resembles a thin copper tube that runs from the control knob to the burner.
    • When the control knob is pressed in, it temporarily bypasses the FFD’s safety mechanism. The thermocouple, when heated, generates magnetism to hold the FFD valve open. If the thermocouple cools down, the valve shuts. This design ensures that, in case the flame goes out, unburnt gases don’t accumulate inside the oven.
    • Sometimes, this thermocouple can fail, which disrupts the mechanism. In some scenarios, only the thermocouple needs replacement.
  2. Thermocouple Positioning:
    • It’s essential to ensure that the thermocouple’s tip is correctly placed within the flame. A dislodged thermocouple or any spillage on the burner can prevent the flame from surrounding the tip, leading to failures.
  3. Control Knob Issues:
    • Occasionally, the knob might prevent the valve tap from being fully engaged. Removing the knob and manually pushing the valve in can sometimes address this issue.
    • If the thermostat or “stat” was recently replaced, there might be issues with how the thermocouple was tightened. Vibration can gradually loosen the thermocouple.
  4. Gas Flow Concerns:
    • Some users noticed that, although gas is emitted from the burner, it doesn’t fully light up when they increase the gas flow. Checking for blockages or issues with the gas valve can help pinpoint the problem.
  5. Seek Professional Help:
    • If these solutions don’t work or if you’re unsure about attempting a fix on your own, it’s always recommended to seek help from a professional, especially given the risks associated with LPG leaks. LPG, being heavier than air, can accumulate in cavities and pose a significant fire hazard if accidentally ignited.

In conclusion, while Thetford ovens are reliable and favored by many, they can sometimes present challenges. By understanding the potential causes of these problems and exploring solutions, users can ensure a safer and more efficient cooking experience in their caravans. Always prioritize safety and consult with professionals when dealing with gas appliances.

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