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My Nordyne furnace blower starts immediately when I turn on

Customer Question
Hello, JA: Hello. How can I...
Hello,
JA: Hello. How can I help?
Customer: My Nordyne furnace blower starts immediately when I turn on the switch. The LED light on the control board flashes 5 times. There is no flame.
JA: Did you check the furnace's filters?
Customer: Yes. I removed the filter entirely for a test.
JA: Do you plan on doing the work yourself?
Customer: If I can. I'm pretty competent.
JA: Anything else we should know to help you best?
Customer: The blower started coming on by itself in the summer time, so I shut off the main switch. At least once while I have been troubleshooting, it went through the sequence and fired properly. Now it wont't.
Submitted: 2 months ago.Category: HVAC
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Answered in 10 minutes by:
9/30/2017
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago
Regan Land
Regan Land, HVAC Technician
Category: HVAC
Satisfied Customers: 716
Experience: Over 20 years of experience, NATE Certified, Licensed HVAC Contractor, Certified IAQ Specialist
Verified

Hello and welcome to Just Answer. My name is ***** ***** I'll be happy to assist you today. Can you please provide the full model # for the furnace?

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Customer reply replied 2 months ago
It's M1MB077ABW
Customer reply replied 2 months ago
Serial # M1M001106168
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Okay, thank you. I show 5 flashes is "115 vac & neutral reversed or no ground." Has there been any electrical work done recently?

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Customer reply replied 2 months ago
No.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Okay, let's check in the furnace to make sure the unit is grounded first. Take a look where the power comes into the unit and see if there's a copper ground wire that connects to the cabinet of the furnace.

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Customer reply replied 2 months ago
ad connection is tight.8
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Okay, let's go ahead and try to reverse polarity just to eliminate that as a possible problem. First, turn the power to the unit off, then remove the wire nuts on the two wires coming into the unit and swap them. Then turn power back on and see if you still get the 5 fashes.

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Customer reply replied 2 months ago
Yep, still 5 flashes.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Okay, go ahead and switch the wires back. Do you happen to have a volt meter?

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Customer reply replied 2 months ago
I have one. It will take a few minutes to get it.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

No problem - Go ahead and test volts AC between L1 and and of the NEUTRAL terminals on the control board.

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Customer reply replied 2 months ago
OK, got it.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Okay, good. Let me know what you read between L1 and Neutral on the board

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Customer reply replied 2 months ago
No reading L1 and neutral. But I found that I can restore connection and get steady light by holding in on the connector. That seems to be where the problem is.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Yeah, signs were pointing to a bad control board. Is the terminal on the wire loose on the terminal on the board? If so, you could use a pair of pliers to tighten the connector on the wire so it fits tight on the terminal on the board. If the terminal is tight then it looks like we have a loose solder joint on the board, which would require a re-solder on the connection or a new control board.

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Customer reply replied 2 months ago
I'll check.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago
Okay thanks
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Customer reply replied 2 months ago
Wires seem tight, and now I can't get a connection, so it probably is a solder loose. I will remove the control board and try re soldering before replacement.
HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Okay, let me know what you find

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HVAC Technician: Regan Land, HVAC Technician replied 2 months ago

Good afternoon - Did you have any luck finding a loose solder connection on the board?

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Regan Land
Regan Land
Regan Land, HVAC Technician
Category: HVAC
Satisfied Customers: 716
716 Satisfied Customers
Experience: Over 20 years of experience, NATE Certified, Licensed HVAC Contractor, Certified IAQ Specialist

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