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how do i lower the water presure ?
plumbing?
pressure switch?
water goes cold during shower?
central heating working but no hot water?
i?
gas neoon flashing?
Cenral heating pump overrun?
30 degree / flame neon flashing?
Spring pressure valve on an open vented system?
no domestic hot water?
were do I get a diagram and information on airpressureswitch 105he?