Make sure the filling loop is shut. If it is, then you may have a leak across the secondary heat exchanger (mains to system), although this is very rare.
what this i had the boiler upstairs and got it move to to the down stairs bathroom and seens them it is over flowing i have shut the filling loop but still going high on the meter on the boiler and diping out on the overflow pipe out side
If you're really sure the filling loop is shut, turn the boiler off, close the flow and return isolating valves and let some water out through the drain cock under the boiler so it's at 1 bar. Leave it overnight (Completely OFF - ie no hot water working). If the pressure on the gauge goes up, the secondary heat exchanger has an internal leak.
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