Aga Bottom Oven Thermostat A5005

ET52006/M5

The Aga Bottom Oven Thermostat (Part Number: A5005) is a precision temperature-control component designed for the lower oven of specific Aga cooker models. This thermostat is responsible for maintaining the gentle, consistent radiant heat required for slow cooking, simmering, and warming.

Unlike the main roasting oven thermostat, the A5005 is calibrated for a lower temperature range. It utilizes a capillary and sensing bulb system to monitor the internal oven temperature and modulate the energy source (gas, electric, or oil) to ensure the oven remains at the correct "simmering" set point.

Key Features and Specifications

Part Number: A5005.

Application: Specifically for the Bottom Oven (Simmering/Warming Oven).

Compatibility: Widely used in Aga 2-Oven, 3-Oven, and 4-Oven traditional models, including Gas (GC/GCEC) and certain 13-amp Electric conversions.

Type: Hydraulic capillary thermostat with a liquid-filled sensing bulb.

Function: Regulates the secondary heat circuit to maintain stable low-temperature cooking conditions.

Common Signs of Failure

Cold Bottom Oven: The thermostat fails to "call for heat," leaving the lower oven cold even when the main oven is at temperature.

Overheating: The oven becomes too hot for simmering, often caused by a leak in the capillary fluid which prevents the thermostat from shutting off.

Erratic Temperatures: Food takes significantly longer to cook or burns on settings that previously worked well.

Physical Damage: Kinks, breaks, or corrosion on the thin copper capillary tube.

Installation and Handling

Capillary Sensitivity: The copper tube connecting the thermostat body to the sensing bulb is filled with specialized fluid. Do not kink or bend this tube sharply, as any restriction will permanently damage the unit and cause inaccurate readings.

Bulb Positioning: The sensing bulb must be placed accurately within its designated clips inside the oven. Ensure it is not in direct contact with the oven walls or heating elements, as this will result in "false" temperature readings.

Safety: Always isolate the electrical and fuel supplies to the Aga before removing the top plate or control panel to access the thermostat.

Calibration: After installation, it is recommended to monitor the oven with an independent mercury or digital oven thermometer to ensure the A5005 is maintaining the correct simmering temperature.

Essential Companion Products

Thermometers: Mercury-in-glass or Digital Oven Thermometer for calibration.

Insulation: Aga Top Plate Insulation (often replaced when the top is lifted to access the thermostat).

Seals: Aga Oven Door Rope Seals to ensure heat retention.

Control Spares: Replacement Aga Control Knobs and Bezels.

Specialist Support and Local Collection

The A5005 is a critical part of the Aga "Simmering" experience. Maintaining the correct temperature in the lower oven is what allows for the signature Aga slow-cooking method. We stock a full range of genuine Aga thermostats for all fuel types.

Visit our trade counter at 61 Fullers Road, E18 2QB for immediate collection. If you are unsure which thermostat your model requires, please bring your cooker's serial number (usually found on the inside of the burner door or the utility plate) and our team will identify the correct part.