Earlier our water was working fine and then the next thing I knew there was no water at all .My husband replaced the pressure switch and still we have no water.What could be causing this to happen?

Have you checked the breaker to your pump motor?

We are assuming that you are saying you have no water pressure at the tank. Is that correct?

Earlier our water was working fine and then the next thing i knew there was no water at all .My husband replaced the pressure switch and still we have no water.What could be causing this to happen?
Could you be more specific in your complaint? Is the pump running but not pumping water? Does the pump not turn on at all? Your hubby replace the control box because? Let us know! Tom

Also, check your main shut-off valve. Maybe he forgot to open it after he finished with his switch replacement.