Riello 40 oil fired burner.

[DIYDel]

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!!!

 

[oilhead]

your problem can be with anything that is switched on at the same time as the burner; pump, motorised valve, thermostats etc. isolate the boiler and see if fuse blows. The burner is the last in line. To test the motor, disconnect the wire from terminal 6 of the base and put it to the live feed without the control box in place.

 

[BampotDelta4]

If you think the fault is at your boiler Del & you have a multimeter, have you tried a simple continuity test on the L or Sw/L to earth, on the appliance only. If the boiler has a faulty component that's shorting, that'll pop your fuses.

 

[dcawkwell]

Most likely cause is usually the central heating pump.

Disconnect that for a start and go from there.