Worcester Bosch 24cdi

[Donatella]

Strange behaviour from boiler, hot water works perfectly fine and modulates. Heating comes on fine the first time according to temperature set, but once the it auto-turns off after reaching desired temperature, even though the CH light remains on, the ignition does not start again even after the radiators have cooled down completely (pump is running). Strange thing is that if I turn on a hot water tap even briefly which triggers the hot water demand and the boiler ignites, the flame remains on as the boiler detects Central heating is required and continues to work until radiators are hot again. Then CH stops and cools down until I manually intervene again it won’t come back on. Resetting the boiler or turning off/on also brings the CH back to life.

Sounds like some PCB issue ?

Thanks

 

[Stuckinarut]

It could be, but could be a diverter issue, control issue, et al. Best to get an engineer out.