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Fujitsu ASU12RL2 Flame Sensor
A flame sensor can only be found on furnaces that burn a gas. It is a safety sensor that will sense the flame when igniting the system. As with most devices used for safety reason, if the sensor produces an error the whole HVAC system will remain stopped for as long as it takes to remedy the problem.
Signals your safety flame sensor is in need of replacing
- The gas that has entered the furnace has difficulty trying to burn under any circumstance
- The heating system runs sometimes barely
- The gas furnace is unwilling to generate heat at all
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