Funny smell and no heating or hot water - UPDATED

I have a bad smell coming from my boilermate 2000 and no heating or hot water today.  The thermostat (I use Hive) has no power to it so I assume something electrical has failed?  I have put a multimeter across the 2 main fuses where power feeds into the boilermate and they seem good but that's where my know how ends.  Any ideas on what else I can check to try and identify the fault?  I can't see any burns or scorch marks anywhere.

**Updated**

My circuit board is actually black and i've been advised that the triac that has blown in the picture is likely owing to one of the pumps failing, so I need to get the pump and board replaced. How would I identify which pump though?

The chip that has burnt, third one up, is the solid state relay for the heating pump. It may be that the pump has failed, however it might also be that it is the main pcb failing that has caused the issue rather than the pump itself.

Could you check a few things to perhaps decide where the issue lies. I assume that there is still power to the pcb? If so are there any of the green LED on at the bottom of the pcb? Is the display on at the top and displaying -on?

I can help you with a replacement pcb, normally I offer an straight forward exchange service but obviously your pcb is somewhat the worse for wear. If you are interested could I suggest that you have a look at my website and use the contact form at the bottom to get in touch with your phone number and i can give you a ring to see if can help.

https://murraymartin.yolasite.com/

Regards Murray

Hi Murray thanks for replying. There is power to the board but no lights or display on the LED screen. I tried calling you this morning so will try again later.