Vokera E10 Fault Code: Causes and Step-by-Step Fix
A working boiler needs the correct pressure to heat your home and provide hot water properly. If your boiler shows the Vokera E10 fault code, it usually means the system pressure has dropped too low. In most cases, you can fix this by topping up the pressure through the filling loop. However, if the pressure keeps dropping again, you may have a leak or faulty part that needs a Gas Safe registered engineer.
What Does Vokera E10 Fault Code Mean?
The Vokera E10 fault code usually means your boiler has low water pressure. When the pressure drops too low, the boiler may stop working to protect the system. As a result, you may lose heating, hot water, or both.
This fault often appears when the pressure gauge drops below 1 bar. Therefore, the first thing you should check is the boiler pressure gauge.
What Pressure Should a Vokera Boiler Be?
Most Vokera boilers should sit between 1.0 and 1.5 bar when the heating system is cold.
Here is a simple guide:
- Below 1 bar – pressure is too low
- 1.0 to 1.5 bar – normal pressure when cold
- Around 2 bar – can happen when heating is running
- Near 3 bar – pressure is too high and needs attention
If the pressure is too low, you may need to repressurise the boiler using the filling loop.
Common Causes of Vokera E10 Fault Code
The Vokera E10 fault code can appear for several reasons. Some causes are simple, while others need professional repair.
Common causes include:
- Low boiler pressure
- Recently bled radiators
- Small leaks in radiators or pipework
- Faulty pressure relief valve
- Expansion vessel issue
- Internal boiler leak
- Faulty pressure sensor
If the pressure only drops once, repressurising may solve the issue. However, if the pressure keeps falling, you should not keep topping it up without finding the cause.
How to Fix Vokera E10 Fault Code – Step-by-Step
Time needed: 5 minutes
Follow these steps to fix the Vokera E10 low pressure fault.
- Check the Pressure Gauge
First, check the pressure gauge on your Vokera boiler. If the needle sits below 1 bar, the boiler pressure is too low.
For most Vokera boilers, the correct pressure should be between 1 and 1.5 bar when the system is cold. - Turn Off the Boiler
Next, turn off the boiler using the power switch or fused spur near the unit. Allow the system to cool before increasing the pressure.
This helps you get a more accurate pressure reading. - Locate the Filling Loop
Now, find the filling loop underneath the boiler. Depending on your Vokera model, the filling loop may be:
An external silver braided hose
An internal filling loop with valves or levers
Do not remove the boiler casing or touch internal parts. - Open the Filling Loop Valves
Slowly open the filling loop valves to allow water into the system. You should hear water entering the boiler.
Watch the pressure gauge carefully while the pressure rises. - Raise the Pressure to 1–1.5 Bar
Allow the pressure to rise until the gauge reaches between 1 and 1.5 bar.
Do not let the pressure rise too high. If it gets close to 3 bar, the pressure relief valve may release water from the system. - Close the Valves Fully
Once the pressure reaches the correct level, close both filling loop valves fully.
This step is important because leaving the valves open can cause the pressure to keep rising. - Reset the Boiler
After closing the valves, the boiler may reset automatically. However, some Vokera models may need a manual reset.
Press the reset button or follow your boiler manual for the correct reset method. - Test Heating and Hot Water
Finally, turn the boiler back on and test your heating or hot water. If the E10 fault clears and the boiler runs normally, the pressure issue has been fixed.
What to Do After Increasing Boiler Pressure
After repressurising your Vokera boiler, keep an eye on the pressure gauge.
The pressure may rise slightly when the heating is on. However, it should not rise close to 3 bar. Also, it should not drop below 1 bar again quickly.
If the pressure falls again within a short time, there may be a leak or faulty boiler part.
Why Does My Vokera Boiler Keep Losing Pressure?
If the Vokera E10 fault code keeps coming back, the boiler or heating system may have an ongoing pressure problem.
1. Leaks in Radiators or Pipes
Check around radiators, valves, pipe joints, and visible connections. Even a small leak can slowly reduce boiler pressure.
2. Recently Bled Radiators
If you recently bled your radiators, the pressure may have dropped because air and some water left the system. In this case, topping up the pressure may solve the issue.
3. Faulty Pressure Relief Valve
The pressure relief valve protects the system when pressure gets too high. However, if it becomes faulty or stuck, it may release water and cause pressure loss.
4. Expansion Vessel Problem
The expansion vessel helps control pressure changes when the water heats up. If it fails or loses charge, the boiler pressure may rise and then drop again.
5. Internal Boiler Leak
Some leaks happen inside the boiler. These can involve seals, valves, the pump, or the heat exchanger. A Gas Safe registered engineer should check internal boiler faults.
When to Call a Gas Safe Registered Engineer
You should call a Gas Safe registered engineer if:
- The E10 fault code keeps returning
- The pressure drops again after topping up
- You see water leaking from the boiler
- The pressure rises close to 3 bar
- The boiler keeps locking out
- The reset does not clear the fault
- You feel unsure about using the filling loop
- You suspect an internal boiler problem
You can top up boiler pressure safely in many cases, but you should never remove the boiler cover or repair internal parts yourself.
Final Thoughts
The Vokera E10 fault code usually points to low boiler pressure. In many cases, you can fix it by locating the filling loop, opening the valves, and raising the pressure to 1–1.5 bar. Then, close the valves and reset the boiler if needed. However, if the pressure keeps dropping or the E10 fault returns, call a Gas Safe registered engineer to check for leaks or faulty parts.
Frequently Asked Questions
Error code A10 typically points to issues with your boiler’s ignition or flame detection system.
The filling loop is usually underneath the boiler. It may be a silver braided hose or an internal filling loop, depending on the model.
Most Vokera boilers should sit between 1.0 and 1.5 bar when cold. If the pressure drops below 1 bar, the boiler may show the E10 fault code.
Some Vokera boilers reset automatically after the correct pressure returns. However, some models may need a manual reset using the reset button.
