You may rmember my earlier tale of woe but this boiler crapped out electrically over Christmas and has had a new PCB, new flow switch, new expansion tank, new oil solenoid. This all cured the original problem. During adjustment, the engineer could not get the CO levels right and changed burner nozzle. Slight improvement but still went to hell when burner box cover replaced. Eventually found insulation plates from balanced flue had dropped into inlet. Cleaned out and CO OK and boiler operated. Worcester said boiler OK without insulation plates; or is it?
Since then - and intermittently but more often than not - water is so hot as to be dangerous. Thermostats on front of boiler have no effect (you can feel the heat radiating off the boiler from a metre away). If I pull the sensor out of the heatslave tank, the thermostat clicks OK. Put it back in and it seems as if it has no set point - it has no effect (it cannot get any hotter!!). Sod's Law- the boiler behaved when engineer came to look at it.
Any ideas?
Since then - and intermittently but more often than not - water is so hot as to be dangerous. Thermostats on front of boiler have no effect (you can feel the heat radiating off the boiler from a metre away). If I pull the sensor out of the heatslave tank, the thermostat clicks OK. Put it back in and it seems as if it has no set point - it has no effect (it cannot get any hotter!!). Sod's Law- the boiler behaved when engineer came to look at it.
Any ideas?
