Ask Experts Questions for FREE Help !
Ask
    tthhj's Avatar
    tthhj Posts: 1, Reputation: 1
    New Member
     
    #1

    Apr 5, 2009, 08:26 PM
    Gas furnace shuts off before it is supposed to.
    Gas furnace will shut off at 69, Thermostat set on 70. Error on furnace says 'Incorrect twinning' check polarity. I have reset furnace and circuit breaker. This has happened 3 times tonight. Janitoral gas furnace. Husband is away with National Guard and cannot be reached on how to fix.:confused:
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Apr 5, 2009, 08:50 PM
    The cure is to reverse the power leeds if crossed OR better yet is to reverse the 24 volt low voltage supply conductors. If you do not know what I am talking about you will need the services of a on site repair person that know what they are doing.

    The circuit board has a glich that is causing this to happen. The board should be OK if the wires are switched as stated.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
     
    #3

    Apr 6, 2009, 05:30 AM

    Is your furnace running on propane or natural gas? If it is propane the may be a low gas pressure switch on the gas line that will give you this fault code if not working correctly.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
     
    #4

    Apr 6, 2009, 05:40 AM

    Why would the wires need switched? It has been working like that for awhile I am sure, can't see where switching the wires are going to do anything
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #5

    Apr 6, 2009, 07:12 AM
    This is right out of the Janitrol/Goodman service manual. Joshdta if you had the manual you would know the answer.

    Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
     
    #6

    Apr 6, 2009, 07:15 AM

    I don't use manuals just common sense
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #7

    Apr 6, 2009, 07:25 AM
    i don't use manuals just common sence

    That is where your problem is to start with. Many items on HVAC are not common sense in nature but driven by the digital age (circuit boards). You better learn to read manuals since all the technology is described by them. The day of taking your best guess/common sense has been over for some time.


    While some common sense will always prevail like is the switch turned on questions the circuit boards and other electronic components cause us to use the factory engineering manuals to decipher most furnace troubles since they are not mechanical in nature but presented in a digital/analogue form.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
     
    #8

    Apr 6, 2009, 11:01 AM

    Hope you got this fixed! Did you end up getting a control board??
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
     
    #9

    Apr 6, 2009, 03:38 PM

    In my 14 yrs and thousands of service calls I have never once had to reverse wire on a furnace that has worked for years. Maybe if the furnace was just installed and the polarity was backwards then I could see this fault being a issue. Other wise the board is bad or there is anouther problem!!
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #10

    Apr 6, 2009, 04:00 PM

    Does the furnace work at all? If it does, then I agree that it is a bad board. If polarity is reversed, the furnace should not work at all. If it works sometimes, and not others, then your board is malufunctioning(given the code you are getting). Every time I have seen a furnace show the twinning error(when only one furnace in place) it has been a fualty board.(assuming the furnace has worked well up to this point.) Best bet here is to call in a tech. Please let us know what they find. Good day.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Furnace ignites but blower won't start till furnace shuts down. [ 7 Answers ]

(Nordyne/Miller G3RA)-I have a furnace HSI(glow plug) that will ignite and burn until it gets too hot and shuts down. As soon as the furnace shuts down the blower starts to circulate air. The blower circulating air cools the furnace and it reignites.Shortly after the furnace ignites the blower...

Furnace shuts off gas [ 1 Answers ]

My furnace randomly lights both sides. After the igniter comes on, the gas kicks in on the igniter side but not on the temp. probe side. It seems that the gas doesn't flow over to that side after it comes on. Is it a blocked valve or gas jet?

Furnace shuts off and on [ 1 Answers ]

Furnace lites, runs for about 30 secs-1 min then shuts off then re-lits and does the same thing over and over. Furnace has pilot control module, what could be the cause

Furnace shuts off [ 1 Answers ]

I have a goodman funace model number gmp100-4. The problem I am having is it turns on then turns right back off. I removed the inspection cover to look at the pilot lighting switch which seems to be OK but seen some corrosion on the gas line switch pretty sure that this is the problem but wanted...

Furnace not heating the house. Damper on the furnace not opening. Motor then shuts. [ 4 Answers ]

My forced-air furnace is not working correctly. The gas works heating the air in the furnace, but When the motor starts the damper doesn't open and the Motor shut down. I need suggestions?:mad:


View more questions Search