AGA Troubleshooting: 4 Common Faults and How to Fix Them

An AGA is built like a tank, but even the most reliable icons need a little TLC from time to time. When your AGA starts acting up—whether it's losing heat or the burner won't light—knowing which part is the culprit can save you days of cold cooking.

At Woodford Bathrooms and Boilers, we supply the high-precision spares needed to get your cooker back to temperature. Here are four common troubleshooting scenarios and the parts you’ll need to solve them.

1. The Burner is "Spluttering" or Won't Stay Lit (Oil Models)

If your oil-fired AGA is struggling to maintain a flame or smells of unburnt fuel, the wick is often the first place to look. Over time, wicks become carbon-heavy and "choked," preventing a clean burn.

The Fix: A fresh wick set.

The Part: Wick Set 6” Don AGA No. 6

2. Uneven Oven Temperatures

Is your AGA running too hot or failing to reach the "Roasting" zone despite being on all day? This usually points to a failing thermostat. The thermostat is the "brain" that regulates the heat flow; when it loses calibration, your cooking results will suffer.

The Fix: Replace the internal thermostat.

The Part: AGA Thermostat A4912 Diamond H (New Type)

3. Electric Control Issues (Flexotemp Models)

Modernized or electric-assist AGAs rely on electrical components to manage fuel flow and heat. If your electric top isn't responding or the fuel valve isn't opening correctly, the Toby Electric Top may have burnt out.

The Fix: Replace the 12V Electric Top.

The Part: Toby Electric Top 12V 12W AGA Flexotemp

4. Poor Heat Transfer or Unstable Burner

If you notice the burner isn't sitting level or the heat distribution feels "off" at the base of the unit, check the Carbon Leg. These components are vital for the structural integrity of the burner assembly within the cast iron housing.

The Fix: Inspect and replace worn burner legs.

The Part: Carbon Leg Don AGA 9

Need Your Parts Today?

Don't wait for a total breakdown. If you are a heating engineer in East London (E18) or a homeowner trying to keep your kitchen warm, we offer two ways to get your spares:

Click & Collect: Order via heating-parts.co.uk and pick up from our Woodford branch.

Trade Counter: Visit us at 61 Fullers Rd, London E18 2QB for expert advice on which part fits your specific model.

Contact the Spares Desk: 01278 455391

Published on 13 March 2026