Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Measurement:

Remove the two screws (one in each corner) from the underside of the case.
Pull the front cover forwards slightly at the bottom then lift it clear of the locating lugs on the top of the appliance.
While not essential, some of the tests in this model will be easier to complete if the side panels can be removed, this requires space to the side of the boiler so in some installations may not be possible.
There are 3 screws holding the panels on, the left panel also has the spark generator attached to it which will also need to be removed.
Once these are removed the side panels can be hinged slightly outward then pulled forward free of the boiler.