What does four flashing red lights indicate on a York Affinity 8.S furnace?Post created: 2016-01-15 Type of Equipment: Furnace Views: 236
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On heating cycle the furnace stops short of set temprature. Usually happens around 61 to 62 F. The set temprature is 68 or 70. When the furnace stops i see four flashing red lights on the control board.
On 2016-01-15 Gary wrote:
Four red flashes indicates that a high-limit switch is open. This can be caused by something restricting airflow, such as a dirty air filter or a problem with the ductwork, as well as a problem with the control board or the blower motor.
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