- Boilers
- Gas boiler
A.02.06
Baxi A.02.06 on a gas boiler: low heating pressure warning
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On the Baxi Neodens Lite, A.02.06 is a low pressure warning for the heating circuit, shown before a fault occurs. Read the pressure on the display with the system cold, top up by hand to 1.0 to 1.5 bar if it is below 0.8 and watch whether it drops again.
Safety first
Stop and check this first
- If you smell gas while the Neodens Lite shows A.02.06, follow the Baxi manual: no flames or smoking, do not operate switches or doorbells, shut off the gas, open the windows, leave the property and call a qualified professional.
- When bleeding radiators after topping up, hold a cloth over the bleed valve: Baxi warns that the water may still be hot. Do not use tools on the filling tap.
Safe checks you can perform
- Read the cold pressure on the display
- Top up only with the blue tap, by hand
- Look for visible damp in the system
- Monitor the pressure for several days
Leave these tasks to a qualified professional
- Do not attempt this professional task: Find where the pressure is lost
- Do not attempt this professional task: Measure the expansion vessel pressure
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Find where the pressure is lost
What they doThe professional inspects the boiler and the system for leaks and confirms that the pressure holds steady after refilling.
They must show youthe leak point or proof that the pressure holds.
In writingthe cold pressure they leave your Neodens Lite at.
Measure the expansion vessel pressure
What they doThey check the expansion vessel pre-charge with the boiler stopped and correct it if it does not suit the system.
They must show youthe reading taken at the vessel valve.
In writingthe final pre-charge they set.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Read the cold pressure on the display
With the system cold, look at the pressure shown on the standby display. Baxi recommends checking regularly that it stays between 1.0 and 1.5 bar; note the value you see alongside the A.02.06 warning.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Top up only with the blue tap, by hand
If it is below 0.8 bar, pull the light blue knob under the boiler downwards and turn it slowly anticlockwise, by hand only, until you reach 1.0 to 1.5 bar. Then close it and check that it does not drip. On heat only models the tap is outside the boiler.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Look for visible damp in the system
Check under the boiler and around valves, radiators and exposed pipes for drips, stains or damp scale. Do not open the boiler; just note where you find water.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Monitor the pressure for several days
Over the following days, check the pressure each morning with the system cold. If you need to top up often, the Baxi manual says to call its authorised service to have it inspected.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Boilers
- Brand
- Baxi
- Product type
- Gas boiler
Known code variants
- A 02 06
- A.02.06
- A02.06
- A0206
- Baxi A.02.06
- Neodens Lite A.02.06
What it means
The Neodens Lite manual separates permanent errors, which stop the boiler and need a reset, from warnings that appear before a fault is detected. A.02.06 belongs to the second group and means low pressure in the heating circuit. To resolve it, the table says to check and restore the system pressure, check the expansion vessel pressure and look for leaks in the boiler or the system. If the pressure drops often, Baxi asks you to contact its authorised service.
Warnings and stop conditions
- Criticalsource verified
If you smell gas while the Neodens Lite shows A.02.06, follow the Baxi manual: no flames or smoking, do not operate switches or doorbells, shut off the gas, open the windows, leave the property and call a qualified professional.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Mediumsource verified
When bleeding radiators after topping up, hold a cloth over the bleed valve: Baxi warns that the water may still be hot. Do not use tools on the filling tap.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Symptoms and causes
Probable causes · in order
- Too little water in the heating circuitCommon
The warning appears when the circuit pressure is low; the manual recommends restoring it if it falls below 0.8 bar, which can also happen after bleeding radiators.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Leak in the boiler or the systemPossible
The table says to check for leaks in the boiler and in the system; a steady loss makes the pressure fall again soon after topping up.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Expansion vessel pressure incorrectPossible
Checking the expansion vessel pressure is another action Baxi links to A.02.06; that measurement belongs to a professional.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Virtual technician
Does A.02.06 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
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