Electric heat: how long should a heat sequencer last?

I bought a condo in April of 2009. The condo complex was completely rebuilt in April of 2007, and I am the first person to live in my condo. The condo has electric heat. At the end of February (after I had lived here less than two years and less than four years after the unit was installed), my heat went out. The... show more I bought a condo in April of 2009. The condo complex was completely rebuilt in April of 2007, and I am the first person to live in my condo. The condo has electric heat. At the end of February (after I had lived here less than two years and less than four years after the unit was installed), my heat went out. The repairman said I had a "faulty" heat sequencer. How long should a heat sequencer be expected to work?
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