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Error F20 means that the unit is overheating, not a safe thing!
This one needs the attention of a Heating engineer unfortunately for safety. More than likely all this one needs is a professional cleaning, when they become clogged they will give this error because the unit is getting too hot internally.
Any Local heating company can handle this and its not expensive . They all offer great deals especially in the summer months.
In any case, I will stick with you until this is complete.
Please rate my service kindly.
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