HVAC Systems · Electric Heat Components
Sequencer
A time-delay relay in electric furnaces and heat-pump strip heat that energizes heating elements in staggered steps, limiting inrush current and preventing all elements from drawing power at once.
Common uses
Staging electric heat strips, limiting startup current draw
Common symptoms
- No electric heat
- Only partial heat output
- Elements all energize at once
Common repairs
- Sequencer replacement
- Element circuit testing
- Wiring inspection
Related terms
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