Most people think their AGA going out is a thermostat problem. In Thomas's experience, it usually isn't.
Thomas has been servicing AGA and Rayburn appliances across Essex and Hertfordshire for several years, working on properties ranging from old farmhouses where the AGA has been running since before the current owners moved in, to rural homes where it's a more recent acquisition and the owners are still learning how the thing behaves. The complaints are almost always the same. The AGA keeps going out. It's going out overnight. It goes out and comes back, then goes out again. And the assumption is usually that it's some kind of electrical fault or a problem with the controls.
The Two Most Common Faults
In almost every case, the cause is one of two things: dirty injectors or a thermocouple that's on its way out.
The injectors on a gas AGA are small orifices through which gas flows to the burner. Over time they collect deposits. Those deposits partially block the injector, reduce the gas flow and make the burner unstable. Eventually it cuts out. The frustrating thing for owners is that this often presents as an intermittent problem, because the appliance can light and run for a few hours before the restricted flow causes it to drop out. It doesn't feel like a simple blockage. It feels like something electrical, or like the controls are playing up. It isn't. It's a fuel delivery issue, and it's fixed by cleaning the injectors properly and, where they've deteriorated beyond cleaning, replacing them.
The thermocouple is a safety device that sits in the burner flame. Its job is to hold the gas valve open while the burner is alight. When it's working correctly, you never think about it. When it's failing, the valve doesn't stay fully open, the gas supply becomes inconsistent, and the burner drops out. On an appliance that hasn't been serviced in a few years, a failing thermocouple is the first thing Thomas checks. It's a straightforward part to replace, and it's included as standard in an annual service.
The Always-On Appliance
What catches a lot of new AGA owners off guard is the always-on nature of the appliance. Traditional AGA models don't get switched off like a regular cooker. They maintain a constant temperature, which is how they deliver the cooking performance they're known for, and that constant operation means they need regular attention. An AGA that goes unserviced for two or three years doesn't fail suddenly as a rule. It loses efficiency gradually, starts using more fuel than it should, and eventually begins dropping out at inconvenient moments, which is usually the point at which someone calls Thomas.
LPG vs Natural Gas
There's something else that's worth understanding about LPG-powered appliances. A lot of properties in rural Essex and Hertfordshire are off the mains gas network. They run on LPG, either from a bulk tank in the garden or from cylinder supplies. LPG behaves differently from natural gas in a few technical respects, and servicing an LPG appliance is not the same job as servicing the mains gas equivalent. Thomas is qualified for both, but it's always worth confirming this when booking an engineer, because not everyone who advertises AGA servicing is set up for LPG work.
What a Proper Service Looks Like
The other point worth making is about the standard of the service itself. A proper AGA service takes time. The flue and the burner area accumulate residue, and cleaning those out thoroughly is part of the job, not a bonus. A service that's done in under an hour on an appliance that hasn't been touched in two years has almost certainly missed things. Thomas has been to jobs where the previous service was carried out by a general heating engineer who saw these appliances rarely and didn't carry the right parts. The difference in how the appliance runs afterwards is usually noticeable. It settles at temperature more consistently, the burner is quieter, and the owners stop worrying about waking up to a cold house because the AGA went out overnight.
Why AGAs Matter to Owners
The attachment that people have to their AGAs is something Thomas has noticed across the years. They're not just appliances. They're central to how a kitchen functions. They give off warmth through the winter. They're often part of why someone bought the house in the first place. When one goes out, the whole house feels it. That's why annual servicing is worth treating as a priority rather than something to get around to eventually.
If your AGA or Rayburn is due a service, or if it's been going out and you're not sure why, call Thomas on 07774 323248. He covers Essex and Hertfordshire and can usually get to most properties within a reasonable timeframe.
