The error code E118 on a boiler typically indicates low water pressure in the system. This is a common issue on many modern boilers, including Baxi and similar brands, that have built-in pressure sensors.
What Causes Low Pressure?
Low water pressure can happen for several reasons:
Leaks in the system
: This could be from radiators, pipework, or even inside the boiler.
Bleeding radiators
: Releasing trapped air from radiators without topping up the system can lower pressure.
Natural pressure loss
: Over time, small amounts of water can escape from the system, reducing pressure.
How to Fix an E118 Error
If your boiler displays the E118 error code, follow these steps:
Check the pressure gauge: It’s usually on the front of your boiler or control panel. The ideal pressure is between 1.0 and 1.5 bar when the system is cold.
Repressurize the system:
Locate the
filling loop
, which is often a small silver braided hose beneath the boiler.
Open the valves on either side of the filling loop slowly to let water into the system.
Watch the pressure gauge, and stop filling when it reaches the recommended level (usually around 1.5 bar).
Close the valves tightly.
Reset the boiler: After repressurizing, reset the boiler to clear the error.
When to Call a Professional
If the pressure drops again after topping it up, or if you’re unsure how to safely repressurize your boiler, it’s best to call a qualified gas engineer. Persistent low pressure may indicate a leak or another underlying issue that needs professional attention.
Keeping your boiler well-maintained can help avoid errors like E118, ensuring your heating system runs smoothly.
