Alarm If ATO Pump Too Long

[dlplunkett44]

I would like to program an email alarm to go off if the ATO pump has NOT run in 4 hours (I may adjust this time). I assume this will use programmable logic, but I can't figure out how to do it.

This stems from an issue I had this morning where the water level was low, and no ATO alarm was going off. I think it may be due to the optical water sensor - either it was dirty or faulty (I've only had it for a few weeks).