Flame Rod Shorted LED code
#1
10-30-18, 12:56 PM
Join Date: Oct 2018
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Flame Rod Shorted LED code
We have an older (1989ish) Lennox NG furnace model G16RQ3-50-7 with a Honeywell S8670K Continuous Retry Controller (?) that's sending out a LED flash code of "7" (flame rod shorted). Other than that, the furnace is operating as it should. Fires right on up and continues its burn until it receives a "stop" from the thermostate. I've checked the flame sensor connections and cleaned the sensor itself and visually inspected the sensor for cracking and all appears to be OK. At this point I'm leaning towards replacing the sensor. Is this the right way to go or is there something else going on here I should be looking at first?
#2
10-30-18, 01:08 PM
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Are you sure it's 7 flashes ?
When that flashes 7 times it should be in a failure mode and should not be lighting.
Do you have the separate flame sensor rod or is part of the spark ignition ?
When that flashes 7 times it should be in a failure mode and should not be lighting.
Do you have the separate flame sensor rod or is part of the spark ignition ?
#3
10-30-18, 02:14 PM
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I video'd it from startup and as you must have suspected, I saw a few additional codes I hadn't seen before. It starts off normally and then when it ignites, it starts flashing codes. It starts off with a "5" (???) followed by an "8" (low input voltage) and then starts throwing "7's" pretty continuously with a periodic "8" thrown in again.
Btw: the sensor is a separate unit. In the video It's connected to the Honeywell just below the LED (the grey wire).
I sent you the video via PM. Hope it goes through. It's 14mg
Btw: the sensor is a separate unit. In the video It's connected to the Honeywell just below the LED (the grey wire).
I sent you the video via PM. Hope it goes through. It's 14mg
#4
01-01-19, 01:52 PM
Did you get any closer to final solution on this? I am getting the EXACT same results after cleaning the flame sensor. Same controller and furnace running but same error codes you received.
Thanks.
Thanks.
#5
01-01-19, 03:01 PM
Group Moderator
Welcome to the forums.
I don't believe we reached a conclusion here. If you are getting the 7 flash code right at startup..... power down..... disconnect the flame sensor wire from the module and restart the system. If you still get the 7 flash code.... that would leave a problem ignition module. The following link has excellent diagnostic routines to follow.
Honeywell ignition module (pdf)
I don't believe we reached a conclusion here. If you are getting the 7 flash code right at startup..... power down..... disconnect the flame sensor wire from the module and restart the system. If you still get the 7 flash code.... that would leave a problem ignition module. The following link has excellent diagnostic routines to follow.
Honeywell ignition module (pdf)
