A water heater that produces no hot water may not be getting power, or it may have a tripped limit switch or one or more failed heating elements. First, check the water heater's circuit breaker in the service panel to make sure it hasn't tripped. If the breaker has tripped, switch it off, then switch it back on again.
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Troubleshooting Circulator Pumps | Boiler Troubleshooting Problems Water circulation problems in a hot water loop can be because of the circulator pump. On older boiler systems that have circulator pumps that have couplings, the most common problems are the couplings breaking.
Components of a Hot Water Boiler A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. However, gas-fired boilers are fairly reliable and, when problems do occur, they are usually related to the expansion tank or water circulation pump(s).