BoilerFaultCodes E302 Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
What to check first
- Locate the external filling loop, which is a flexible silver hose connected to two valves under your boiler.
- Open both taps on the filling loop slowly to let water into the system while watching the pressure gauge.
- Close both taps firmly once the needle sits in the green zone, typically between 1.0 and 1.5 bar.
Parts commonly replaced
- Filling loop
- Pressure relief valve
- Expansion vessel