Rayburn Thermostat Cooker 700-980 Ro4T360681 R5406

50-300'C

The Rayburn Cooker Thermostat (Part Number: R5406), also identified by the manufacturer reference RO4T360681, is a high-temperature capillary thermostat designed specifically for the oven control of Rayburn oil and gas-fired cookers. This particular model is calibrated for a temperature range of 700 to 980 (internal reference units), which corresponds to the standard cooking temperatures required for the roasting and baking ovens.

This thermostat is the "brain" of the cooker's temperature regulation. It monitors the oven heat via a liquid-filled sensing bulb and modulates the fuel supply (or switches the burner) to maintain a consistent cooking environment.

Key Features and Specifications

Part Number: R5406.

Alternate Reference: RO4T360681.

Temperature Range: 700–980.

Compatibility: Used in the Rayburn 400 Series (e.g., 480K, 499K), Rayburn Supreme, and Rayburn Nouvelle models.

Type: Capillary and Bulb.

Components: Includes the thermostat body, a flexible copper capillary tube, and a temperature-sensing bulb.

Common Signs of Failure

Oven Not Reaching Temperature: The thermostat may be cutting out too early, preventing the oven from getting hot enough for roasting.

Oven Overheating: If the internal fluid in the capillary leaks out, the thermostat will "fail safe" or fail to shut off the burner, leading to dangerously high oven temperatures.

Inaccurate Dial Readings: A significant discrepancy between the dial setting and the actual oven thermometer reading.

Burner Not Firing: If the thermostat circuit remains "open," the burner will not receive the signal to ignite.

Installation and Maintenance

Capillary Care: The copper capillary tube is extremely delicate. It must not be kinked or bent sharply, as this will crush the internal bore and render the thermostat useless.

Bulb Positioning: The sensing bulb must be securely mounted in its dedicated clips within the oven. If it touches the oven wall or is improperly positioned, it will provide inaccurate readings.

Calibration: While these are factory-calibrated, some models allow for minor adjustments behind the control knob to align the dial with a known-accurate oven thermometer.

Electrical Safety: Always isolate the power supply to the cooker before attempting to replace the control thermostat.

Essential Companion Products

Control Knobs: Replacement Oven Temperature Control Knobs.

Indicators: Oven Temperature Gauges (Door Mounted).

Burner Spares: Control Box/Programmer and Solenoid Valves.

Seals: High-temperature Oven Door Rope Seals (to ensure heat retention).

Specialist Support and Local Collection

Accuracy in your oven temperature is vital for the performance of a Rayburn. We stock the R5406 thermostat along with the associated limit thermostats and thermocouples for the entire Rayburn range.

Visit our trade counter at 61 Fullers Road, E18 2QB for immediate collection. If you can provide your cooker's serial number, our team can verify that the R5406 is the correct revision for your specific appliance.