How to top up the pressure on a worcester bosch 350 combi?
We've drained down the radiators & although we've re-filled them, maintaining pressure at approx 1.5, the low pressure light has remained on. We've tried the reset button on the top of the Worcester Bosch 350 combiboiler. The only light lit on the panel is the low pressure one. Can anyone assist. (somebody answered a similar question saying to top up the boiler but we haven't a clue how to do this
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