I have an ongoing intermittent issue with a oil fired Heatslave 20/25 OSO condensor boiler.
Occasionally the boiler gets very hot, the DHW gets very hot indeed. When it is in this state, both thermostat controls (DHW and CH) do not respond. In addition, if the room thermostat is turned on, the CH does not come of and the diverter valve does not operate. It seems that the boiler goes into a hot state of paralesis!
Replace so far by engineer: DHW thermostat, diverter valve. I have replaced the CH thermostat and the main boiler thermostat (as these were cheap and easy to replace). It seems better than it was before the diverter valve and latter 2 thermostats were replaced but still is not right.
It has had a PCB board in the past, but this functioned fine for a good while.
If I let the boiler cool down, it works fine and may do so for soem time before it happens again.
Anybody go any clues?
Occasionally the boiler gets very hot, the DHW gets very hot indeed. When it is in this state, both thermostat controls (DHW and CH) do not respond. In addition, if the room thermostat is turned on, the CH does not come of and the diverter valve does not operate. It seems that the boiler goes into a hot state of paralesis!
Replace so far by engineer: DHW thermostat, diverter valve. I have replaced the CH thermostat and the main boiler thermostat (as these were cheap and easy to replace). It seems better than it was before the diverter valve and latter 2 thermostats were replaced but still is not right.
It has had a PCB board in the past, but this functioned fine for a good while.
If I let the boiler cool down, it works fine and may do so for soem time before it happens again.
Anybody go any clues?
