Combi boiler timer wiring help

[Tom Bettinson]

I moved into my new flat and the timer for the combi boiler wasn't working. I just unscrewed the front to take a look inside and it turns out the timer isn't wired at all. I can't find the installation manual for either the boiler or the timer to explain which wire needs to go in which terminal, and can't find this information online. It's a Baxi combi boiler and a Grasslin FM/1 ST H timer. There are 4 terminals and 1 brown wire, 1 blue wire and 2 black wires. I assume that brown = L, blue = N, black = Switch. Can anyone tell me which colour should be connected to which terminal? Images attached. Thanks!

 

[JohnD]

what does the wall thermostat look like (this is not a joke)?

 

[Tom Bettinson]

There's no wall thermostat. I just want to connect the timer which is 'built in' to the combi boiler. Pictures attached.

 

[Johnmdc]

Brown to 1
Blue to 2
One Black to 3
Other black to 4 (it doesn't matter which way round)

 

[Tom Bettinson]

All sorted now, thank you for your help!!

 

[Dean744PiN5]

get a thermostat fitted otherwise your just burning money.