F62
Viessmann
Gas Valve Shutoff Delay
Boiler shows F62, may indicate gas valve closing delay
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Sticking gas valve, slow-closing actuator, PCB timing fault, contamination in gas valve
How to Fix / Troubleshooting
Safety: A valve that does not close correctly is a serious safety risk.
- Shut down boiler: Turn off the boiler and isolate gas until inspected.
- Technician inspection: A gas engineer must test valve closing time and leak tightness using manometers and leak detection fluid.
- Replace gas valve: If any doubt exists about valve integrity, replace with a genuine Viessmann-specified valve.
- PCB check: If a new valve behaves the same, the PCB timing circuit may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
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