i have a bosch hthb84k single oven combined with microwave. when we turn on the microwave it cuts out after a few seconds. This happened once before but the problem went away on its own.

Peter, June 2012

The shortest diagnostic interval is 3 seconds peter so i would say your high voltage inverter board is faulty costs about £130 but as with all microwave ovens I would recommend repairs carried out only by trained personnel. Inverter output is 5000 volts! Also safety laws require microwave leakage tests to be carried out. Note there is a fuse for this inverter board on the main pcb on facia, people have changed inverter and exact same problem exists because they havn't found the fuse . Cheers

Kenjo, June 2012

it is a fraction under 3 seconds nearer to 2 seconds to be nonest

Peter, June 2012

The cutting out of the microwave is a diagnostic indicator, how many seconds it runs before it cuts out indicates which part is faulty. Check it precisely, if it is 3 seconds the high voltage inverter board is faulty. If longer will be other fault need to know how many seconds to further diagnose. Cheers

Kenjo, June 2012