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ok will do and thanks for your help

The pump is on the right hand side,pressure guage is underneath,two switches on panel at front of pcb panel with a flame light,power light and lockout light. dhw flow switch is slightly to left and above control pcb pipes for hot water go to heatexchanger on left side ch on right side...

insufficient water flow temperature is ok not sure as to model not in front of boiler

Hello can anybody give possible answers as to why flow of hot water is poor. on pipe from the heat exchanger flow there are two sensors,one of which appears to be screwed in.is it possible the end has broken off sensor and lodged itself in pipe? thanks in advance for any help