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Why does your furnace come on for less than a min and shut back off with red light flashing 7 times?
Wiki User
∙ 11y ago
red light on your furnace blinking 7 times.
This means lockout caused by no ignition (after 3 tries).
#1 cause is the flame sensor is dirty or end of life. You can try to clean it with emery cloth (not sand paper).
#2 cause is the hot surface ignitor.
both can be bought online or at your local hardware store.
Wiki User
∙ 11y ago
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