When troubleshooting a hydronic heating system,the technician notices the circulator pump running and the burner firing ,but no hot water is flowing through the system,what is the most likely problem?

Question

Quizplus · Accepted Answer

The presence of air in the system can prevent hot water from circulating properly, even if the circulator pump is running and the burner is firing. Bleeding the air out of the system should resolve the issue. Defective circulator pumps or high limit switches would likely result in no circulation at all, while a defective thermostat would not impact the circulation of hot water.

When Troubleshooting a Hydronic Heating System,the Technician Notices the Circulator