If an electrical appliance stops working, then the first thing you can check is whether the fuse has blown in the plug.
Unplug the item and carefully unscrew the back of the plug using a screwdriver. You will see three different colored wires coming into the cap and the fuse. You need to undo the screw holding in the fuse and take it out and replace it with a new one. Ensure you replace it with the same type of fuse that was there, e.g., replace a 3A with a 3A. Under no circumstances should larger fuses be inserted to prevent the fuse blowing, as this indicates a potentially dangerous defect with the item concerned.
In new molded plugs which cannot be taken apart the fuse is usually sited in a plastic holder which can be accessed from the pin side of the cap and levered merely out with a small screwdriver.
If you have replaced the fuse with a new one and the fuse continues to blow when the appliance is switched on, it is more likely that the machine has a severe fault and a electrician mona vale engineer should be employed to look at the instrument.
Often on heating systems, the fuse can blow if the heating pump becomes aged and it intermittently blows a fuse, slightly annoying to locate. Then the central heating pump can be replaced with a new unit, and usually, this resolves the problem.
You can test a fuse to see if it has blown by using a multimeter set on resistance. If you set the meter to read ohms on approximate a range of up to 2000 ohms and put the leads on either end of the fuse, then you should get a reading of zero (approximately). If the meter reads “one,” it means the fuse has failed and should be replaced. Again if you do this and it continues to blow a fuse then the appliance has a severe fault.