When running bath water the water starts out hot and then goes cold and then hot again. When watching the main burner it comes on full and then a few minutes later cycles to minimum (not pilot) and then obviously cools and goes to full fire again only to reduce to minimum after a few minutes on full fire. My thinking is that there is an overheat sensor on the boiler hot water output that is indicating(incorrectly, that there is an overheat problem - can any one suggest what might be gouing on so that we can get this fixed.

Paul Barton, January 2010

the information above is not quite right - when the main burner shuts down it goes to pilot only and then re-fires after a brief period less than 30 seconds

paul barton, January 2010