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Nordyne M1B, M1G, M1M - User Manual

Nordyne M1B, M1G, M1M
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Installation Instructions
Series M1B, M1G, M1M & M5S
Downfl ow, Direct Vent (Sealed Combustion)
Forced Air Gas & Oil Furnaces
WARNING:
!
DO NOT DESTROY. PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
ATTENTION INSTALLERS:
It is your responsibilit y to know this produ ct
better than your customer. This includes
being able to install the product according
to strict safety guidelines and instructing the
customer on how to operate and maintain the
equipment for the life of the product. Safety
should always be the deciding factor when
installing this product and using common
sense plays an important role as well. Pay
attention to all safety warnings and any other
special notes highlighted in the manual.
Improper installation of the furnace or failure
to follow safety warnings could result in
serious injury, death, or property damage.
These instructions are primarily intended
to assist qualifi ed individuals experienced
in the proper installation of this appliance.
Some local codes require licensed
installation/service personnel for this type
of equipment. Please read all instructions
carefully before starting the installation.
Return these instructions to the customer’s
package for future reference.
For installation in:
• Manufactured Homes
• Recreational Vehicles, Park Models, &
Manufactured Buildings
• Modular Homes/Buildings
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your
building.
• Leave the building immediately.
• Immediately call your gas supplier
from a neighbors phone. Follow
the gas suppliers instructions.
• If you cannot reach your gas
supplier, call the fi re department
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings
exactly could result in serious
injury or property damage.
• Installation and service must
be performed by a qualified
installer, service agency or the
gas supplier.
• Do not store or use gasoline
or other fl ammable vapors and
liquids in the vicinity of this or
any other appliance.

Table of Contents

Questions and Answers

  • B
    bryantmercedesAug 21, 2025
    Why Nordyne M1B, M1G, M1M combustion blower runs but no flame?
    • R
      Roger CoxAug 22, 2025
      If the combustion blower in your Nordyne furnace is running but there's no flame, check the operation of the centrifugal switch by removing the end bell of the burner motor if you have an M1B model. Clean the contacts of the motor and if the contacts are closed, replace the motor. For M1M & M1G - 077, 090 Models with a defective pressure switch, check the air tube and electrical connections. Ensure the burner isn't simply in purge mode, allowing 75 seconds for the flame establishing period. Check for proper electrical connections at the purge timer, control box, or gas valve, and verify the gas supply by ensuring the gas line valve and control lever are on.
  • A
    Arthur CastilloAug 25, 2025
    Why Nordyne M1B, M1G, M1M main flame ignites then burner locks out?
    • E
      Erica RodriguezAug 25, 2025
      If the main flame ignites but the burner locks out on your Nordyne furnace, it could be due to several reasons: the ignition control is not properly grounded, the ignition control is defective, there's improper polarity of the 120-volt power supply, the ignitor has a hairline crack, improper gas pressure or burner air adjustment is preventing the flame from contacting the ignitor tip for flame rectification, or a misaligned ignitor is not allowing the flame to contact the ignitor tip for flame rectification.
  • A
    Andrew ClayAug 26, 2025
    What to check if Nordyne M1B, M1G, M1M burner is short cycling?
    • J
      Jeanette WalshAug 26, 2025
      If your Nordyne furnace is experiencing burner short cycling with the thermostat calling for heat and the limit switches closed, check for proper polarity and grounding. Inspect the flue, combustion air, gas pressure, and orifice. Also, check the position of the ignitor; a normal reading should be 40-75 ohms.
  • M
    Michelle DavisAug 27, 2025
    Nordyne M1B, M1G, M1M control module powered but ignitor won’t heat up, what to do?
    • J
      Jason HardingAug 28, 2025
      If the control module is powered but the ignitor won’t heat up in your Nordyne furnace, disconnect the ignitor leads at the AMP receptacle and check for 120 volts at the plug during the ignition sequence. If 120 volts is not available at the AMP plug during the ignition sequence, replace the ignition control.
  • G
    gporterAug 29, 2025
    Why Nordyne M1B, M1G, M1M Furnace has burner flame without motor running?
    • D
      Devon PriceAug 29, 2025
      If your Nordyne furnace has a burner flame without the motor running, the gas valve may be stuck open. Check the gas valve for proper operation and replace if necessary; also, inspect the heat exchanger. Check for 115 volts to the combustion blower motor and replace if necessary. If there is no power to the combustion blower, check the wiring and control module; replace if necessary.
  • L
    Logan McclainAug 31, 2025
    What to do if Nordyne Furnace has powered gas valve but no flame?
    • X
      xchavezAug 31, 2025
      To troubleshoot a Nordyne furnace with a powered (24 VAC) gas valve but no main flame, first verify that the manual shut-off valve is OFF. Check that the pilot flame is established and that the gas valve control lever is in the ON position. Also, check the incoming gas pressure. If the main burner still does not come on under these conditions, replace the gas valve.
  • Q
    qgreerSep 2, 2025
    Why Nordyne Furnace causes high gas bills?
    • A
      alisonhansonSep 2, 2025
      If your Nordyne furnace is causing high gas bills, verify that the proper orifices are being used. Check the return air system to ensure it is clear and free of blockage. Inspect the furnace filter to see if it's clean or needs replacing. Make sure the home is well-insulated, that windows and doors fit tightly, and that there are no leaks in the heating duct system. Check the room thermostat to ensure the setting isn't higher than necessary and verify the proper humidity level in the home.
  • S
    Steven PenningtonSep 4, 2025
    What to do if Nordyne Furnace pilot will not light or keeps going out?
    • H
      Hailey NormanSep 4, 2025
      If your Nordyne furnace pilot will not light or goes out, check the incoming gas pressure and ensure the proper pilot orifice is installed according to the furnace nameplate specifications. Check for proper pilot flame adjustment. Verify the thermocouple millivoltage, ensuring it reads between 18 - 30 mv; if not, the gas valve electromagnet may be defective, and the gas valve should be replaced if necessary. Confirm the pilot shield is in place and check for gas leaks. Also, inspect the flue assembly for air leaks.
  • M
    Michael MillerSep 6, 2025
    How to fix Nordyne M1B, M1G, M1M Furnace main flame not burning properly?
    • D
      daniel37Sep 7, 2025
      If the main flame in your Nordyne furnace is not burning properly, check the manifold gas pressure and ensure the correct main burner orifice is installed according to the furnace nameplate specifications. Inspect the flue for any blockages or loose connections and check the combustion air passages for any blockage.
  • M
    Mark CarrSep 8, 2025
    Why Nordyne Furnace burner operates but insufficient heat?
    • J
      Jeffery NelsonSep 8, 2025
      If your Nordyne furnace burner operates but provides insufficient heat, check the thermostat for proper setting and location, ensuring it's not affected by another heat source. Ensure you have a clean filter and proper air flow. Check the burner for the proper gas firing rate and ensure the unit is not undersized for its thermal load. Check the thermostat anticipator.

Nordyne M1B, M1G, M1M Specifications

General IconGeneral
BrandNordyne
ModelM1B, M1G, M1M
CategoryFurnace
LanguageEnglish

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