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i would have thought it unlikely the suprima pcb is faulty if the flow and return are hot....although you dont say how hot.
sounds like they are clutching at straws now and how many straws they clutch depends on how much whining you do.
having said that an intermittent fault on a gledhill can be a pain to diagnose
sounds like they are clutching at straws now and how many straws they clutch depends on how much whining you do.
having said that an intermittent fault on a gledhill can be a pain to diagnose