It started acting up at the end of last week. I turned off the power, let the system completely cool down, then power it up. It fires up the first or second time it tries to light on the first call for heat no problem…then once the system calls for heat the second time it tries to fire…but won’t stay lit. Shuts down and throws code 34.
The diagnostic panel on the unit says it could be the flame sensor: it recommended to try to sand the flame sensor’s exposed probe so the oxidation was removed and it should do it’s thing again.
Sandpaper to sand with? Is 600 grit OK?
The panel says the operating range is to come up to .5 microamps when flame is detected. I can test for this. Is it DC or AC and what operating range is it, 24 VDC, 110 VAC, etc?
where are your condensation lines running? find the main one…see if it comes off…take it off and aim it at the floor and see if water runs out…if it trickles try sucking it first then aiming it at the floor…along with sanding the flame sensing unit. I’ve seen a bunch of furnaces need this to make them fire up…all from the same manufacturer though
I just sanded the flame sensor with 600, reset the system and it fired right up three times in a row.
I looked it up, another 15 dollar part if I replaced it (like the start/run cap I replaced on the cooling system this summer). That would have cost me $100 minimum if I called out someone.
Flame sensors on those Bryant 310/311 models are pieces of shit. Keep an eye on that sensor it will do that pretty much every heating season or 2 until you get rid of that furnace.
:hsugh:
80% furnaces are not condensing furnaces, just an FYI
