Is it dangerous to reset a boiler with a F4 fault code?

If your boiler has locked out and is showing the F4 fault code, it’s not dangerous. The lock out you’re experiencing is a safety function. If the boiler continued to operate, there’s a chance it could be dangerous. And that’s why we never advise people to reset their boiler when there is a fault code being displayed.

What causes a F4 fault on a Viessmann boiler?

In the case of the F4 fault code, it’s more likely that the gas valve is stuck closed, when it should be open. That means it’s not able to feed gas via the jet and into the burner. Ultimately, that leads to not flame being produced, and a flame detection fault.

Where does the F4 fault code come from?

After replacing the valve and resetting the boiler, the F4 fault code should be cleared from the user interface. The PCB gives and receives signals from the electrical components in your boiler. That includes everything mentioned above, from the gas valve, through to the flame sensor.

What happens when Intergas boiler fault code 4 is displayed?

In the case of fault code 4, the printed circuit board isn’t recognising that there’s a flame signal. After a fault code has been displayed, your boiler is going to lockout. For some faults, this is to preserve boiler components from further damage.

Why is my F4 boiler not producing flame?

This is called “letting-by”. In the case of the F4 fault code, it’s more likely that the gas valve is stuck closed, when it should be open. That means it’s not able to feed gas via the jet and into the burner. Ultimately, that leads to not flame being produced, and a flame detection fault.

What causes a boiler to have a flame failure?

The flame failure trip in a typical boiler can be due to one of the following reasons: loss of ignition; fuel valve closed, unstable flame, low airflow, very high furnace pressure, dirty flame sensor and loss of electrical supply.