The most common furnace failure encountered by HVAC service technicians is the breakdown of the hot-surface igniter or the accumulation of carbon soot on the flame sensor. Hot-surface igniters glow intensely every time the furnace calls for heat, subjecting them to continuous thermal stress that eventually causes them to crack and fail. Similarly, dirty flame sensors fail to detect burner ignition, triggering safety switches that shut the furnace down to prevent gas leaks. Other frequent failures include blown blower motor capacitors and tripped limit switches.
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