Thermostat is turned off so the central heating shouldn't be on. However the radiators are all giving out heat (very hot).
Worcester Bosch,
boiler Greenstar 24i junior/28i junior
MT10RF/mechanical RF thermostat
Any suggestions on how to turn heating off until I can call an engineer in the morning (it's midnight). Thanks
Hi, The problem is the divertor valve (probably the actuater). The boiler is trying to heat the water in the heat exchanger to enable instant hot water from a tap.
Usually takes a few seconds.
In your case the valve hasn't diveted so the water is flowing through the rads.
Engineer should check actuator motor firstly.
Simple fix, shouldn't cost much.
Hope this helps!
allgasinstaller.
September 2016
It's now 6am - turn off the electrical power supply to the boiler
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.