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Mend Glowworm 18sxi blr Pressure Fault

how can i fix o.o pressure glowworm 18sxi blr?

f9 fault showing on facia board. pressure reading 0.0
checked connection between main pcb and pressure switch, changed pressure switch,tried anew pcb. pump ok no blockage in pipe work . there enough pressure from the mains. can anyone help

natu
January 2013

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