What does the E9 fault code on a Worcester Bosch boiler mean?
The E9 fault code on a Worcester boiler is an overheat code. It signifies that the safety temperature limiter in the central heating (CH) flow has tripped.
To understand this, let’s break this explanation into plain English…
Your boiler has a safety feature called a temperature limiter. Think of it as a guardian that makes sure your boiler doesn’t get too hot, such as over 105 degrees, which could fry its insides.
Now, this limiter has buddies – sensors – placed in two pipes coming out of your system. They’re like the guards on the gates. If the temperature shoots up beyond the safe zone, these sensors (the guards) notice and raise the alarm.
So, when the sensor in the pipe where the hot water is heading out (that’s the CH flow pipe) senses a fault, it activates and displays the E9 code. It’s like your boiler’s way of saying, “Houston, we’ve got a temperature problem in the central heating flow!”
What are the causes of the Worcester fault code E9?
There could be a few reasons why your boiler is overheating including a faulty heat exchanger, a blocked or broken pump, and faulty wiring and sensors. We would always advise getting your boiler investigated by a qualified gas safe engineer like our team at Maintracts Services.
The typical cause codes displayed along with the E9 fault code are:
One of the 3-digit codes listed above will sometimes flash along with the E9 fault code. If it doesn’t, press the return/spanner button, and your boiler should display the information.
The main causes why the E9 code is displayed are: