Faulty LNB or faulty Multiswitch ?

[timbo4000]

I am in a block of 24 flats (3 storey high) which has 2 satellite cables piped in to each flat, each flat being piped up to a multiswitch and then in turn of course to the satellite dish.

I have attached a picture of the Multiswitch so you can see what type, brand and model number it is.

The problem is that all the flats are able to receive Vertically polarized channels but not Horizontally polarized ones. This started last Thursday when we had about 2 days of heavy rain.

I have checked the cabinet and the multiswitch to see if it encountered water damage from the rain, but the inside of the cabinet was dry as was the multiswitch.

Could it be that the Quattro LNB is faulty or the Multiswitch has just given up being able to switch between H/V ?

Any advice would be most gratefully received.