When your device displays Vaillant fault f20, you need to define the problem and fix it. Use this troubleshooting guide for help.
A boiler's computer will display what it thinks is the most relevant fault code for the issue. If a PRV has been removed or blocked to stop a leak (which is not the correct fix anyway), there's a chance the increased pressure could cause a F20 fault code to appear. Some Vaillant boilers don't have a "pressure too high" related fault code.
The Glow-Worm Boiler Fault Code F20 Error Common Q & A
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Listed below are the common Heat Line fault codes as described by the boiler manufacturer along with a possible cause. Heat Line Fault Codes. F20: Overheating fault: Verify the fan's electrical connections: F49: EBUS voltage fault: Verify that the eBus controls are fitted and wired correctly
What does the F20 fault code mean on my Glow-Worm boiler If you are seeing the F20 fault code on your Glow-Worm boiler, the manual will state that this is a "software compatibility" issue. Your boiler is controlled by a printed circuit board (PCB).
Vaillant Boiler F20 Fault Code Over Heating