My Warmflow boiler with a Riello 40 pressure jet burner has been fine for 18 years. It is controlled by a lifestyle programmer. Now it will not power up. Turning on the power at the fused spur supply results in a blown fuse. A multimeter across the boiler supply terminals gives a reading of about 30 ohms. Seems a bit low? No other obvious problems with the control box, capacitor or wiring. What sort of resistance should there be across the motor windings?? Any ideas? Help!!!