Bosch oven went ‘pop’ (HBA63A250B /02 FD9001)

[SpicyChicken]

I had my oven running for about five minutes when I heard a loud pop and the power went off. After restoring power, the oven is completely dead. A little investigation showed:

1 – the light bulb, which was working immediately before, is blown.

2 – the mainboard has a black mark on it where a component (small, flat, rectangular) used to be. The tracks wither side of this component lead to a relay on one side and a cable, leading to the light, on the other.

3 – One of the PCB tracks next to the blown component has a 3mm gap in it. There is no doubt in my mind that the component took out the track – I can see a trail of black marks from the component, across the gap in the tracks to the side of another relay.

I can see no other damage: I checked all the cables, the PSU board, all the controls. All look fine (but could have suffered internally).

My guess is that when the bulb failed, it drew a huge current causing the component to fail, explode and damage the track.

At the moment, when powered up, the oven is completely dead. My guess is that I need either a new power supply board, control board or both.

Any suggestions on how I work out which is dead and where I can order the board(s) from?

Thanks.

[electrofix]

Re: Bosch oven went ‘pop’ (HBA63A250B /02 FD9001)

go here
http://www.bosch-home.co.uk/customer-se … pare-parts

put Enr number in for complete part breakdown and availability

or you could ask

http://www.qer.biz/servReps.htm

Dave

[SpicyChicken]

Re: Bosch oven went ‘pop’ (HBA63A250B /02 FD9001)

Well, I ordered a replacement board from https://www.ransomspares.co.uk/ and swapped it over, but this hasn’t brought the oven back to life. I’m happy that I have made the swap correctly – I’ve checked the wiring several times.

When I power the oven up, nothing happens: no display. When I adjust the controls: nothing happens. No relay clicks, no fans. I think I expect the latter because I haven’t set the clock – but having no display makes doing so hard. Pressing any of the controls on the display panel yields no response.

There are only two other boards to swap out: the display or the power supply.

If the power supply was broken, the oven wouldn’t work. It looks pretty simple: AC in DC out. If I knew the pinouts then I could test for the correct DC voltages. Is there a way to find the pinout? It has a five pin connector between the PSU and the main board.

The display is more complex and is connected to the two rotary controls on the front panel. If the power supply was working ok, maybe the display / controls have faults.

Any suggestions how to proceed, including “stop wasting your time and just call a service engineer”..?

Am I overlooking anything?

[electrofix]

Re: Bosch oven went ‘pop’ (HBA63A250B /02 FD9001)

one of the problems with computer type boards is they don’t like electrical spikes which are caused when things go pop

if you have changed the power board then you need to check its powered after that if as you say its connected ok all the other boards are suspect

we also have the same problem. Bosch wont share tech info unless you are one of their agents

Dave

[SpicyChicken]

Re: Bosch oven went ‘pop’ (HBA63A250B /02 FD9001)

Thanks for the reply – I bet you’re right, but not knowing what to swap makes this difficult to sort out.

Looking at the prices of the other boards I think I know where this might end:

PSU £70
Operating module (behind the display) £110
The one rotary control £26
The other rotary control £41

That’s £247. Added to the £80 I just spent, that is way more than half the price of a new one. My guess is that it’ll be the operating module – most complex and central part. But it could be the whole lot.

I could call someone in to look at it, but if it is just the operating module and I have to pay for the labour, it probably isn’t worth the cost for an eight year old oven.

I’m not sure i’ll put a bulb in an oven again. I’m actually rather disappointed that something as simple as a blown bulb has wrecked the whole oven.

[electrofix]

Re: Bosch oven went ‘pop’ (HBA63A250B /02 FD9001)

crazy isn’t it

got a Neff microwave / convection oven in for repair. that a full size oven with a microwave, expensive units. Lamp blew and took the whole thing out

they could put a 3A fuse in or use a fused lamp but no !!

Dave

[Author]

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