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View Full Version : Burner comes on and goes off before reaching temp, set on the thermostat


iceman1159
Jan 12, 2010, 12:47 PM
My furnace model# is concord 90 High eff c2e24b-24, The thermostat call for heat the burner comes on for 15 sec and goes off. This happens 6 or 7 times and it shuts off.
What should it do to correct it

hvac1000
Jan 12, 2010, 12:59 PM
This is a stretch but try to clean the flame sensor. Fine sand paper or steel wool works well.