Noisy Boiler Worcester Hi- Flow 3.5

[s5shug]

Changed the pump recently.Problem with the pump delay board. Changed this! Pump operating ok now but system boiling internally.Changed hot water stats but during start-up and run-down when the pump runs for approx 10 mins there is a very worrying noise (overheating water?) from the boiler.Any suggestions appreciated.

 

[Mike Jackson]

Sludge?


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[diamondgas]

Did you use heatsink on the stats? What one's exactly have you replaced? There are half a dozen if I memory serves me well 🙂

 

[s5shug]

Did you use heatsink on the stats? What one's exactly have you replaced? There are half a dozen if I memory serves me well 🙂

What do you mean by heatsink I have changed trhe dhw control thermostat as werll as the dhw overheat thermostat

 

[diamondgas]

Is the DHW o'heat top right outside the main burner box? There were that many versions of Worcester floor standing boilers they kind of merge in my head 🙂

Heatsink is a thermal conductive paste that helps give a more accurate temp transfer from the pipe to the stat! Without it can result in an inaccurate reading of the water temperatures!

 

[s5shug]

Many thanks Diamondgas.Yes the overheat stat is top right above heat exchanger.Never put any paste on stat.Will it make much difference?