Practical advice from experienced AGA engineers
AGAs are built to last, but like any heat storage cooker they rely on correct setup, good insulation and regular servicing to perform properly. Most issues we see are common, gradual problems rather than sudden failures.
This guide explains the most frequent AGA problems, what usually causes them, and when it is time to call an engineer.
AGA Not Hot Enough
If your AGA is struggling to reach temperature or food is taking longer to cook, the issue is often related to heat retention rather than the fuel supply itself.
Common causes include:
- Insulation breakdown inside the cooker
- Burner or element efficiency reducing over time
- Incorrect control settings or calibration
- Heat loss through worn door seals
An AGA that feels warm but does not cook as expected is often losing heat internally. This is usually resolved through servicing, insulation replacement or refurbishment rather than major repairs.
AGA Too Hot on the Outside
The outer panels of an AGA should feel warm, but not uncomfortably hot. If the sides, lids or front are noticeably hotter than usual, it is often a sign that insulation has deteriorated.
This can lead to:
- Higher running costs
- Uneven oven temperatures
- Excess heat in the kitchen
Older cookers and heavily used models are more likely to develop this issue. Replacing insulation restores efficiency and improves temperature stability.
Oil AGA Keeps Going Out
An oil-fired AGA that regularly goes out is one of the most common call-outs we receive.
Typical causes include:
- Carbon build-up in the burner
- Blocked oil filters or fuel lines
- Air entering the oil supply
- Incorrect oil pressure or nozzle issues
Regular servicing is essential for oil AGAs. If your cooker is going out repeatedly, do not attempt to relight it while hot. Allow it to cool fully and contact a qualified engineer.
Uneven Oven Temperatures
AGAs work on radiant heat rather than fan-assisted air circulation. Each oven has a fixed temperature zone, but problems can occur if heat balance is disrupted.
Causes include:
- Worn door seals allowing heat to escape
- Insulation breakdown in one section
- Incorrect internal alignment after previous work
If one oven is consistently cooler or hotter than expected, it is usually correctable through servicing or refurbishment.
Strange Smells or Noises
Some sounds are normal as an AGA heats and cools, especially after being turned off and restarted. However, strong smells or unusual noises should not be ignored.
Contact an engineer if you notice:
- Persistent fuel smells
- Smoke from the flue or burner area
- Loud banging or repeated clicking
- Electrical buzzing from control panels
If in doubt, switch the cooker off and seek advice before continuing to use it.
AGA Taking a Long Time to Heat Up
AGAs are designed to heat slowly and steadily, but excessive warm-up times can indicate an underlying issue.
Common reasons include:
- Cold starts after long shutdown periods
- Age-related efficiency loss
- Reduced insulation performance
If warm-up times have increased noticeably compared to previous years, a service or inspection is recommended.
When to Call an AGA Engineer
You should book a professional inspection if:
- The cooker repeatedly goes out
- External surfaces are excessively hot
- Oven temperatures are inconsistent
- You notice fuel smells or smoke
- Running costs increase without explanation
Early attention usually prevents more costly repairs later.
Preventing Common AGA Problems
The best way to avoid issues is through regular maintenance and sensible use.
- Follow recommended servicing intervals for your fuel type
- Keep hotplate lids closed when not in use
- Monitor changes in temperature or performance
- Address small issues before they become larger faults
Modern electric conversions and refurbished insulation systems can also significantly improve reliability and efficiency.
Professional AGA Support
Smart Range engineers service, refurbish and convert AGAs across Surrey, Kent, Sussex and London. If your cooker is showing signs of a problem or you would like advice on improving performance, our team is happy to help.
Contact Smart Range to book an inspection or discuss your AGA.
