Coleman lights up, but shuts down soon after...
Posted: Sat Nov 17, 2012 6:52 pm
Coleman Evcon Furnace
Model: DGAT07800
Serial Number: 970704823
Has Fresh Air Intake Duct coming from roof (attic?) that opens up (butterfly valve opens) when thermostat turns furnace on. One only On/Off switch (in a box) for this, just below blower assembly.
Furnace initially wouldn't light because ignitor had a bad spot in it (about 11 years old, I was told). Replace ignitor with new - now flame comes on (appears to be full, to me - have seen a weak one before), but shuts off soon after. Within about 10 seconds.
Is the flame sensor supposed to be directly in the path of the flame, almost immediately at the end of the main burner tube where the flame shoots out? Do these flame sensors ever fall out of position (rotate from vibration), so the sensor ends up pointing down, instead of horizontally (in front of the burner tube)? I can't be sure now, but I'm thinking maybe this flame sensor was, indeed, pointing downward. Going back tomorrow or Monday to take another look.
In the mean time, grateful for any help (other possible causes for this abrupt shut down situation?), if anyone hangs out here on a Sunday? (or tonight - Saturday night?). Have a safe weekend.
Model: DGAT07800
Serial Number: 970704823
Has Fresh Air Intake Duct coming from roof (attic?) that opens up (butterfly valve opens) when thermostat turns furnace on. One only On/Off switch (in a box) for this, just below blower assembly.
Furnace initially wouldn't light because ignitor had a bad spot in it (about 11 years old, I was told). Replace ignitor with new - now flame comes on (appears to be full, to me - have seen a weak one before), but shuts off soon after. Within about 10 seconds.
Is the flame sensor supposed to be directly in the path of the flame, almost immediately at the end of the main burner tube where the flame shoots out? Do these flame sensors ever fall out of position (rotate from vibration), so the sensor ends up pointing down, instead of horizontally (in front of the burner tube)? I can't be sure now, but I'm thinking maybe this flame sensor was, indeed, pointing downward. Going back tomorrow or Monday to take another look.
In the mean time, grateful for any help (other possible causes for this abrupt shut down situation?), if anyone hangs out here on a Sunday? (or tonight - Saturday night?). Have a safe weekend.