Nordyne Model# M1MB 070A BW

Questions about repairs and parts for Nordyne furnaces, air conditioners and heat pumps for manufactured homes including Intertherm, Mac and Miller brands. Click here for Nordyne parts.

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mhbix

I have the subject furnace and recently replaced the pressure switch. Now when I turn on the furnace it will cycle 3 times and shut down. The control module light now flashes 4 times. Do know what the problem may be now?

Thanks
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Mark
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The board in your furnace is a 903429. Below are the codes for that board:

Red light:
Steady on - OK
Rapid Flash - False flame or internal control fault.
1 Flash - Limit switch open.
2 Flash - Pressure switch open w/ inducer on.
3 Flash - Pressure switch closed w/ inducer off.
4 Flash - Lockout due to failed ignition.
5 Flash - Reversed polarity.

Yellow Light:
Steady On - Good flame signal.
Blinking - Weak flame signal.
Steady Off - No flame signal.
You can't fail if you don't try!
mhbix

What can be the causes of failed ignition?
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Robert
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Joined: Wed Feb 28, 2007 12:07 am
Location: Tennessee

Hi,

3 most common are the Hot Surface Ignitor, Remote Flame Sensor or the Gas Valve.


I believe your furnace HSI is also the flame sensor, would have to look to be sure .


Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
karlee75
Posts: 1
Joined: Sun Nov 08, 2009 12:09 pm

my furnace will run its heat cycle like its supposed to then when it shuts off the fresh air fan stays on for 10
seconds then the blower will kick on with no fault lights ever
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Robert
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Posts: 6413
Joined: Wed Feb 28, 2007 12:07 am
Location: Tennessee

Hi,

Please start a new thread and then delete this post. We keep threads to original poster for ease of following.


Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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