To safely light an oil-fired Aga range cooker, open the oil supply valves, switch on the electric supply to the oil control box, press the reset lever, confirm the manual lever is on automatic, wait 15 minutes for oil to reach the burner, then light through the inner-door lighting flap. Switch the control box off for a 30-minute warm-up. The flame should turn from yellow to a clean blue with glowing shells. Never re-light a hot burner. If it fails twice, stop and call an engineer.
Have these to hand before you begin:
Visually inspect the burner area before doing anything else. Do not attempt to light the cooker if you see any of the following:
If any of these are present, leave the cooker and call an engineer.
Critical safety rule: never re-light a hot burner. If the cooker has only just gone out, leave it for a minimum of one hour, ideally let it cool fully. Vaporised oil already in a hot burner pot can ignite explosively when introduced to a flame.
Open every valve on the feed pipe between the oil tank outside and the cooker. Most installations have a manual shut-off near the tank and another near the cooker. Both must be open.
The oil control box, usually mounted on the wall behind or beside the cooker, needs power to manage oil flow. Switch it on at the wall spur.
On the control box, press the reset lever gently downwards until it clicks. There is no need to hold it down. This re-arms the oil feed.
The manual lever on the control box should be turned to the right, in the automatic position. Some boxes label this clearly; others use an arrow or a small notch.
This is the single most commonly skipped step, and it’s the cause of most failed re-lights. The 15-minute wait allows oil to reach the burner pot at the correct rate. Trying to light an empty pot achieves nothing except a burnt-out match.
Use the time to put the kettle on. Do not shortcut it.
After 15 minutes, open the inner oil door to access the burner. Light a long match or taper, insert it through the lighting flap, and close the flap.
If the burner fails to ignite, check the fire valve reset button on the control box. Some installations include a heat-sensitive fire valve that trips during a re-light attempt. Push the reset button in firmly, then return to Step 6.
Once the burner is lit, replace the inner oil door and switch the electric supply to the control box off. The burner now runs on the oil already in the pot. The control box stays off for the warm-up phase.
The flame burns yellow at first. This is normal. The burner pot is not yet hot enough to vaporise oil cleanly. Over the next 30 minutes the pot heats up and the flame should change colour.
A correctly burning oil Aga flame is blue with incandescent (glowing) shells. If the flame is still yellow after 30 minutes, sooty, or smoking, switch the control box off, ventilate the room, and call an engineer.
If the flame is correct, switch the electric supply to the control box back on. The thermostat now takes over, switching the burner between high and low fire automatically.
During warm-up, condensation can run down the inside of the flue and onto the hob top. Wipe it away with a cloth.
| Phase | Time from light | Flame appearance | What it means |
|---|---|---|---|
| Initial ignition | 0-5 minutes | Small, yellow | Burner pot still cold |
| Warm-up | 5-30 minutes | Yellow with growing blue base | Pot heating up |
| Steady state | 30+ minutes | Blue with glowing incandescent shells | Burner correctly vaporising oil |
| Fault | 30+ minutes | Yellow only, no blue | Fault – switch off, call engineer |
| Critical fault | Any time | Black smoke or strong oil smell | Stop, ventilate, call engineer |
In order of frequency, the issues we see most often when called out across Yorkshire, Cumbria and the North East:
If you have had two failed re-lights in a row, stop. Each attempt risks pooling oil in the burner pot, which becomes increasingly dangerous on the next attempt.
Pick up the phone if any of the following apply:
John Wray Range Cookers covers Yorkshire, Cumbria, the North East, Lancashire and parts of the East Midlands and Lincolnshire from our workshop in Brompton on Swale. Call 01748 811030 for a same-day answer.
The lighting routine, soot, oil smell and rising fuel cost are putting many oil-Aga owners off the format altogether. The numbers are stark.
Annual running cost of an oil-fired Aga at current 2026 oil prices:
| Cooker | Weekly oil use | Annual oil use | Cost per year (at £1.12/L) |
|---|---|---|---|
| 2-oven oil Aga | ~40 litres | ~2,080 litres | ~£2,330 |
| 4-oven oil Aga | ~51 litres | ~2,652 litres | ~£2,970 |
Source: Aga fuel consumption specifications cited on Wikipedia, John Wray Aga running cost page.
Annual running cost of a modern electric Aga conversion:
| System | 2-oven annual cost |
|---|---|
| eControl Series X-Squared | £208–£468 |
| ElectricKit Advanced | £312–£624 |
Source: John Wray running cost analysis.
A 2-oven oil Aga costs approximately 5× as much to run as a modern eControl conversion at current oil prices.
If you are reading this guide because you are fed up with the lighting routine rather than curious, an Aga electric conversion solves the problem permanently. The cast iron stays. The colour stays. The look and feel stay. What changes is no more lighting, no more flue, no more oil deliveries, and roughly half to one-fifth of the running cost depending on which system you choose.
We convert oil-fired Agas to electric from £4,150 for a 2-oven cooker. Read more about:
How long does it take to re-light an oil-fired Aga from cold?
About one hour total. The active steps take a few minutes; the rest is the 15-minute oil-feed wait and the 30-minute warm-up. There are no shortcuts.
Can I re-light my Aga immediately after it goes out?
No. Wait at least an hour, ideally let it cool fully. Re-lighting a hot burner can cause vaporised oil already in the burner pot to ignite explosively.
My oil tank is full but the Aga won’t light. Why?
Most likely the 15-minute wait was skipped, or a fire valve has tripped. If the reset button doesn’t fix it, you may have air in the feed line that needs bleeding by an engineer.
Should the flame be blue or yellow?
Yellow during the first 30 minutes is normal. After that, the flame should be blue with glowing incandescent shells. A flame that stays yellow indicates a fault and you should call an engineer.
Does an oil Aga need electricity to run?
Yes. The control box and oil feed valve are electrically operated, so a power cut to the cooker spur will put an oil Aga out.
How often should an oil-fired Aga be serviced?
Annually as a minimum. Skipping services is the most common cause of failed re-lights and, in worst cases, dangerous burner faults. Engineers should be used for service and repair work.
How much does it cost to run an oil-fired Aga in 2026?
Approximately £2,330 per year for a 2-oven model and £2,970 for a 4-oven model, based on Aga’s published consumption (40 and 51 litres per week respectively) and current UK heating oil prices of around £1.12 per litre.
Is an Aga electric conversion really cheaper to run than oil?
Yes, substantially. A modern eControl or ElectricKit conversion typically costs £208-£624 per year for a 2-oven cooker, compared with around £2,330 for the same cooker running on oil at current prices. That is a 4× to 11× reduction depending on usage and system choice.
Where do you cover for service or conversion work?
We cover Yorkshire, Cumbria, the North East, Lancashire, and parts of the East Midlands and Lincolnshire from our Brompton on Swale workshop. Free delivery and installation are included within 100 miles of our showroom. Outside that radius we’ll quote based on postcode. Call 01748 811030.
Swale Lodge, Scorton Road, Brompton on Swale, Richmond, North Yorkshire, DL10 7EQ
© 2026 - John Wray Range Cookers is a trading name of John Wray Country Stoves Ltd | All rights reserved.
John Wray Country Stoves Ltd is an independent re-seller and is not authorised by or affiliated with Aga Rangemaster Ltd. “AGA” is a registered trademark of Aga Rangemaster Ltd.
