Loss of water pressure suddenly in hair salon wash basins
I own a large hair and beauty salon and I have lost water pressure suddenly. I have water but it is weak mainly in the wash basins though where the water pressure loss is mostly noted on basement level (same level as water heater). With the upstairs wash basin no water can get through up to the pipes so no water is coming out in that wash basin (ground level).
It is a large electric water heater about 10 years old, it looks OK, can't see any leaks any where. The shop was closed for 4 years not being used. I have had the shop for just on six months and with no problems till now.
Is this major? Please advise before I get my plumber out.
Many thanks Matthew