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