Goodman Furnace - No Heat, No Code
#1
03-12-18, 03:42 AM
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Goodman Furnace - No Heat, No Code
You can't make this **** up. I still haven't resolved the issue with my hot water heater (waiting on parts) and woke up this morning to no heat upstairs.
It's a natural gas furnace installed in the attic so it has a normal flue (as opposed to the high efficiency one I have in the basement). The burner is firing every 10-30 seconds, staying on for a second or two and then shutting off. It will cycle like this indefinitely. I finally just shut it off.
Lacking any codes, I'm not sure where to begin. It's about 6-years old. I haven't pulled the cover off yet so I don't know the exact model number. The manual says it's in the GMS8, GDS8, GHS8, GKS9 family.
Any advice would be appreciated!
-Jim
It's a natural gas furnace installed in the attic so it has a normal flue (as opposed to the high efficiency one I have in the basement). The burner is firing every 10-30 seconds, staying on for a second or two and then shutting off. It will cycle like this indefinitely. I finally just shut it off.
Lacking any codes, I'm not sure where to begin. It's about 6-years old. I haven't pulled the cover off yet so I don't know the exact model number. The manual says it's in the GMS8, GDS8, GHS8, GKS9 family.
Any advice would be appreciated!
-Jim
#2
03-12-18, 04:06 AM
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Okay this was an easy one so I figured I'd post back in the event it helps someone in the future.
The stupid air filter was clogged. I've never had that happen before. My Nest thermostats tell me when to change the filters and I do.
The manual said that one possibility of no heat-no codes is improper airflow across the burners. So that was the first thing I tried and it worked!
The stupid air filter was clogged. I've never had that happen before. My Nest thermostats tell me when to change the filters and I do.
The manual said that one possibility of no heat-no codes is improper airflow across the burners. So that was the first thing I tried and it worked!
#3
03-12-18, 07:51 AM
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Well it was fine for the past couple of hours after replacing the air filter, but now it's back to the same issue. Must have been a coincidence that it worked after I changed the filter. Again, symptoms are:
- Inducer motor runs
- Burner fires and goes out after a second or two
- Burner repeats lighting and going out ever 10-30 seconds indefinitely
- Blower fan runs as it should, but blows cold air
- No trouble codes
- Inducer motor runs
- Burner fires and goes out after a second or two
- Burner repeats lighting and going out ever 10-30 seconds indefinitely
- Blower fan runs as it should, but blows cold air
- No trouble codes
#4
03-12-18, 09:34 AM
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Okay - the flame sensor rod was dirty. It seems to be working now. I discovered it with the help of this video:
https://www.youtube.com/watch?v=G0kKR8vJ3VQ
https://www.youtube.com/watch?v=G0kKR8vJ3VQ
#5
03-12-18, 09:36 AM
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#6
03-12-18, 10:01 AM
Member
The unit should display an error for lack of flame, if the flame signal is insufficient.
Do not rely on your Nest thermostat to tell you when to change the filter. It has no idea when the filters dirty beyond a timer when you reset the filter reminder.
Do not rely on your Nest thermostat to tell you when to change the filter. It has no idea when the filters dirty beyond a timer when you reset the filter reminder.
#7
03-12-18, 01:40 PM
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It does have LEDs and a sight window, but it wasn't displaying any faults. It just kept lighting the burner and relighting it a few seconds after it went out. It seemed like it would do it forever if I hadn't shut it down.
#9
03-15-18, 06:45 PM
Group Moderator
It wasn't displaying a fault code. Was it blinking anything ?
It should be on for normal. If it was on and the burner was cycling.... it could indicate a thermostat problem,
It should be on for normal. If it was on and the burner was cycling.... it could indicate a thermostat problem,
