What does F62 on Vaillant boiler mean?
What does F62 on Vaillant boiler mean? faulty gas valve According to the Vaillant troubleshooting guide, the F62 fault code on your boiler relates to a faulty gas valve. This signals the gas valve to open, providing more fuel, more energy, and more heat. Once heat and gas supply is sufficient, the circuit board tells the gas valve to close. How do you fix F62? How to Fix a Vaillant F62 Error. This problem can usually be fixed by freeing or replacing the stuck or damaged gas valve. The problem may also require the electronics to be repaired, and in...