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thanks, certainly fan fault. the fan is MVL RG130/0800-3612, could I buy one and replace it? is it legal DIY it?

thanks a lot, I remembered they checked the boiler after changing meter, got hot water.

bosch combi boiler RD 532, when turn on, iginition light isn't on, after a while, the front display keep flashing with C 1, seems everything is fine except cann't light on. no hot water and heating,, after change gas meter,never use for a couple of month. PLZ help