Anyone an HVAC expert?
Forced air heating. Lennox furnace manufactured sometime in 2011/12 with a Google Nest thermostat. The issue is the heat will not kick on, but only intermittently. We've woken up a handful of times in the morning and the house is 55°. Replacing a clogged filter as well as giving the igniter and flame sensor a good clean with steel wool helped immediately. As soon as I did that it fired up and worked great for about 2 weeks. Constant heartbeat on the control panel. The last two mornings--we woke up to a 55° house again.
What I know:
-The control panel is flashing 5 times which indicates a "gas burner failed to ignite" code.
-Turning the furnace off/on again typically helps, though I may have to do it 3-4 times for it to finally ignite.
-The igniter gets red hot. I am only assuming red hot is hot enough to light the gas that is being vacuumed through.
-The flame shoots across the burners for a split second--but from what I can tell it is not even long enough to hit the farthest burner that has the flame sensor in front of it. This suggests to me that the flame sensor isn't the issue, since it doesn't see the flame at all because its cut out so quickly (maybe I am wrong there?). This happens for 5 cycles and then it goes into lockout mode. Hence the hard resets that I have been having to do.
-Pressure switch is active. I can blow into that and hear the click meaning it is closing. I can hear it click with the furnace trying to start as well.
-Gas valve--How can I troubleshoot a gas valve?
Some additional background--we had the popcorn ceiling removed prior to moving into the house, as well as carpet. My popcorn contractor wasn't exactly "clean" since keeping the old carpet clean was not a concern. I only mention this because when I replaced the clogged filter it was full of white dust and particles. Is it possible that the return vents have sucked in so much popcorn dust that it has clogged the burner and/or gas valve? I took my compressor to everything and blew it out the best I could. What should I try next? I had a contractor out, but surprisingly the system was working fine when he was there. Its hard to diagnose an issue when everything is working fine.
Forced air heating. Lennox furnace manufactured sometime in 2011/12 with a Google Nest thermostat. The issue is the heat will not kick on, but only intermittently. We've woken up a handful of times in the morning and the house is 55°. Replacing a clogged filter as well as giving the igniter and flame sensor a good clean with steel wool helped immediately. As soon as I did that it fired up and worked great for about 2 weeks. Constant heartbeat on the control panel. The last two mornings--we woke up to a 55° house again.
What I know:
-The control panel is flashing 5 times which indicates a "gas burner failed to ignite" code.
-Turning the furnace off/on again typically helps, though I may have to do it 3-4 times for it to finally ignite.
-The igniter gets red hot. I am only assuming red hot is hot enough to light the gas that is being vacuumed through.
-The flame shoots across the burners for a split second--but from what I can tell it is not even long enough to hit the farthest burner that has the flame sensor in front of it. This suggests to me that the flame sensor isn't the issue, since it doesn't see the flame at all because its cut out so quickly (maybe I am wrong there?). This happens for 5 cycles and then it goes into lockout mode. Hence the hard resets that I have been having to do.
-Pressure switch is active. I can blow into that and hear the click meaning it is closing. I can hear it click with the furnace trying to start as well.
-Gas valve--How can I troubleshoot a gas valve?
Some additional background--we had the popcorn ceiling removed prior to moving into the house, as well as carpet. My popcorn contractor wasn't exactly "clean" since keeping the old carpet clean was not a concern. I only mention this because when I replaced the clogged filter it was full of white dust and particles. Is it possible that the return vents have sucked in so much popcorn dust that it has clogged the burner and/or gas valve? I took my compressor to everything and blew it out the best I could. What should I try next? I had a contractor out, but surprisingly the system was working fine when he was there. Its hard to diagnose an issue when everything is working fine.