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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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We have a Nordyne furnace with electronic pilot ignition. We

Customer Question

We have a Nordyne furnace with electronic pilot ignition. We have replaced the pressure switch and the control board and the unit will still not start. Light flashes open pressure switch.
JA: Did you check the furnace's filters?
Customer: Yes they are clean and good
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: It's in a manufactured home if that helps at all
Submitted: 2 months ago.
Category: HVAC
Expert:  airheatman replied 2 months ago.

Does the small vent come on when you call for heat?

Customer: replied 2 months ago.
It kicks it right to open pressure switch as soon as you call for heat
Expert:  airheatman replied 2 months ago.

THere is a small vent motor called an induced draft motor. The pressure switch is normally open.On call for heat that inducer motor has to come on to draw vacuum on the switch to close it. I am asking if that little fan is coming on?

Customer: replied 2 months ago.
No it does not
Expert:  airheatman replied 2 months ago.

OK that is why pressure switch is not closing.Do you have a volt meter so we can troubleshoot to see if that small motor is getting power?

Customer: replied 2 months ago.
No that is why we replaced the board
Expert:  airheatman replied 2 months ago.

No it is not getting power or no you do not have a meter?

Customer: replied 2 months ago.
No it is not getting power.
Expert:  airheatman replied 2 months ago.

OK until it gets power switch will not close.What is model on furnace?

Customer: replied 2 months ago.
Model # M1MB070ABW
Expert:  airheatman replied 2 months ago.

Lets try bypassing thermostat.To do this, JUmp the R and W wires at the furnace.http://i.imgur.com/JprQdYv.png

Customer: replied 2 months ago.
We did that and it still shows the open pressure switch
Customer: replied 2 months ago.
thanks for your time but our card just sent us a fraud alert bye.
Expert:  airheatman replied 2 months ago.

Probably because you have not used the site before. JustAnswer has an A+ rating with Better Business Bureau.Just let me know if you wish to continue .

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