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Aquastat Relay makes a buzzing sound

    1. Check the aquastat control settings and verify it is calling for heat as expected based on temperature demand. Adjust settings as needed.
    2. Inspect the contacts on the aquastat relay and clean any pitted or corroded contacts.
    3. Tighten any loose wiring connections on the aquastat and at the control circuit terminal blocks.
    4. Test the transformer that powers the control circuit with a multimeter. Check for correct voltage. Replace if faulty.
    5. Look for signs of burned contacts on the relay indicating it needs replacement. Check for loose or vibrating armature.
    6. Verify relay is properly grounded. Buzzing can occur if it is ungrounded and energized.
    7. Make sure control circuit fuses or breakers are not blown or tripped. Reset or replace as necessary.
    8. Contact a technician to check if supply voltage to the aquastat is unstable. Solid state relay may be needed.
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