boiler fires up when cold tap is running?

  • Thread starter Thread starter mah
  • Start date Start date
M

mah

as the post suggests i was wandering why this would happen.its happened on various combi boilers iv noticed.
 
you must have a dead leg some where, may need to install a DHW expansion vessel
 
The dhw flow/micro switch is being triggered (bouncing) when the cold water moves.
 
thanks for the replys both i was wandering about the flow switch and hoped i was on the right tracks.
 

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