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@Airhead
If it's a vaillant and the code if F.00 it's - This means that your Flow NTC (Negative Temperature Coeficient Thermostat) cable is either defective or broken and needs to be replaced.
I'm going to guess it's not that though. F on it's own could be Failure to light after 3 attempts.
Is it cold enough where you are for the condensation pipe to freeze?