Gas furnace burner short cycling


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Old 01-05-23, 06:57 PM
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Gas furnace burner short cycling

Nordyne model MG1E-056 , unit goes through cycle, igniter with come on, about 30 seconds, gas valve will open , burner comes on for about 8 seconds, then gas valve shuts and it starts to cycle again, red light is on, yellow light is flashing
 
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Old 01-05-23, 07:43 PM
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Interesting heater. A bit involved. Looks to have a hot surface gas igniter.
It also looks like it uses the same igniter to sense the flame.

Go to this link.
The site is in frames. I can't give the direct address.
Click on "installation instructions"
Click on upper "MG1" to download pdf manual.
Roughly around page 22 they discuss control boards. Several are used. You will need to identity yours. There is a yellow light discussed and it may be the one you see blinking. It's supposed to tell you if the flame sensor is sensing ok.
 
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Old 01-05-23, 08:19 PM
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burner short cycle

I have the Nordyne 1021575R control board, pulled the igniter, cleaned it ,there was nothing really on it, installed it, started unit, went through it's cycle, iginiter came on, gas valve opened, burner lite,checked voltage at gas valve, zero volts unit unitl gas valve signal , came to 25.93 volts, ,opens to a low-fire position, and ran about 8 seconds gas valve shut ,dropped voltage gas valve never to high-fire,
 
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Old 01-05-23, 09:16 PM
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Ok. What was the flame sensor (yellow) LED doing ?
What code did the red LED display ?
You have a smart board there.
Cleaning a hot surface igniter doesn't usually change its surface resistance but can crack it.
 
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Old 01-06-23, 05:52 AM
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burner short cycle

The yellow light is flashing, never solid, the red light is solid, unit the unit cycles 4 times, then the red light flashes 4 times, indicating lock out, the igniter ohm out ok
 
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Old 01-07-23, 09:44 AM
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burner short cycle

Update
I replaced the igniter/flame sensor, started unit it went through it's cycle, burner fired up , yellow light flashed 6 times, red light solid, then flame went out , any ideas
 
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Old 01-09-23, 01:58 PM
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Thumbs up burner short cycle

Replaced Nordyne 1021575R control board, $93.00 from supply house. Started unit , went through cycle, burner came on for 3 seconds then went to high fire , furnance working normal
 
 

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