Could be a number of things. You need to run through a serious of troubleshooting steps. First you need to make sure the pump has Power. Easiest steps are checking the breakers, timers, or any switches that control it. Anything further requires a voltage meter, and familiarity with electricity. Don't go further if your not comfortable working with electricity. If there is no power to the pump work your way back and find out where there is no power and address that issue first. Once you have power to the pump, verify that you can turn the shaft freely. if the shaft does not turn bearing are likely seized, but you should hear a humming noise. If you do get a hum the start capacitor, or winding is likely bad. if still no hum then the motor windings are likely bad. you can check this by disconnecting the supply wires from the motor (you have to disconnect, not just shut off power) and checking with an ohm meter. you should get a continuity reading, if not the windings are bad. there are several more steps you can take, but without more information that's hard to determine. start with the above and see where it gets you.
If your system is equipped with a circ pump, it may be configured to work in one of three different ways: 1)
The circ pump operates continuously (24 hours) with the exception of turning off for 30 minutes at a time
when the water temperature reaches 3°F (1.5°C) above the set temperature (most likely to happen in very
hot climates). 2) The circ pump stays on continuously, regardless of water temperature. 3) The circ pump
will come on when the system is checking temperature (polling), during filter cycles, during freeze
conditions, or when the blower or another pump is on.
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