It's heating season again and I have a 6 zone hot water heating system and one zone is not working suddenly. It was working fine the other day and today the zone pump will not go on. The thermostat appears to be working fine as it is calling for heat. Is there a procedure that I can follow to determine if the pump has gone bad or if there is a rely that I can test to see if it is bad? Any help would be appreciated!

Regards... Norm