Nordyne M1M Series User Manual

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For installation in:

1. Manufactured Homes

2. Recreational Vehicles, Park Models,

Manufactured Buildings

3. Modular Homes/Buildings

WARNING:

If the information in this manual is not

followed exactly, a ﬁ re or explosion

may result causing property damage,

personal injury or loss of life.

– Do not store or use gasoline or

other ﬂ ammable vapors and liquids

in the vicinity of this or any other

appliance.

– 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 build-

ing.

• Immediately call your gas supplier

from a neighbor’s phone. Follow the

gas supplier’s instructions.

• If you cannot reach your gas sup-

plier, call the ﬁ re department.

– Installation and service must be

performed by a qualiﬁ ed installer,

service agency or the gas sup-

plier.

WARNING:

Should overheating occur, or the gas

supply fail to shut off, shut off the man-

ual gas valve to the appliance before

shutting off the electrical supply.

WARNING:

Improper installation, adjustment,

alteration, service or maintenance

can cause injury or property damage.

Refer to this manual. For assistance

or additional information consult a

qualiﬁ ed installer, service agency or

the gas supplier.

Owners Manual/Installation Instructions

Series M1B, M1G, M1M and M1S

Downﬂ ow, Direct Vent (Sealed Combustion)

Forced Air Gas and Oil Furnaces

LEAVE THESE INSTRUCTIONS WITH THE HOMEOWNER.

Table of Contents

Other manuals for Nordyne M1M Series

Installation Instructions40 pages

Questions and Answers:

L
Lynn DicksonAug 22, 2025
Why Nordyne M1M combustion blower runs but no flame?
- S
  Shane McmillanAug 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.
D
dgutierrezAug 25, 2025
Why Nordyne M1M Furnace main flame ignites then burner locks out?
- C
  Christina StaffordAug 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.
C
Carol Castaneda MDAug 26, 2025
What to check if Nordyne M1M Furnace burner is short cycling?
- C
  Cassandra RamirezAug 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.
E
Erin TaylorAug 28, 2025
Nordyne M1M control module powered but ignitor won’t heat up, what to do?
- A
  Andrew FoxAug 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.
E
Elizabeth TaylorAug 29, 2025
Why Nordyne Furnace has burner flame without motor running?
- G
  gbradleyAug 30, 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.
M
Michael YangSep 1, 2025
What to do if Nordyne M1M Furnace has powered gas valve but no flame?
- D
  Danielle MasseySep 1, 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.
B
Brooke RosalesSep 3, 2025
Why Nordyne M1M causes high gas bills?
- O
  osawyerSep 3, 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.
M
mcdonaldryanSep 5, 2025
What to do if Nordyne Furnace pilot will not light or keeps going out?
- K
  kevinpatelSep 5, 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.
C
castillocynthiaSep 7, 2025
How to fix Nordyne Furnace main flame not burning properly?
- D
  Daniel GutierrezSep 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.
W
wilcoxtraciSep 9, 2025
Why Nordyne M1M Furnace burner operates but insufficient heat?
- S
  Sandra CoffeySep 9, 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 M1M Series Specifications

General

Brand	Nordyne
Model	M1M Series
Category	Furnace
Language	English

Summary

Specifications

General Description

Overview of M1 Series gas and oil furnaces for manufactured homes and RVs.

Owner Information

Manufacturer Warranty & Owner Responsibilities

Installation Standards

Applicable Standards

Compliance with HUD, ANSI, NFPA, and CSA standards for installation.

Unit Location

Minimum Clearances

Return Air Provisions

Air Distribution Systems

Roof Jack Selection

Duct Connector Selection

Platinum Series Connectors

Selection of 14" round duct connector for Platinum ready construction.

Non-Platinum Series Connectors

Selection of duct connectors for non-platinum units based on floor cavity size.

Installation

Transit-Mode Venting System Installation

Electrical Wiring

Fuel Piping

Flue Gas Sampling

Lighting and Shutdown

General - All Models

Safety information and general instructions for lighting and shutting down all furnace models.

Standing Pilot Lighting

Step-by-step guide for lighting furnaces with a standing pilot.

Direct Ignition Operating Instructions

Instructions for operating M1M direct ignition models, including safety and startup.

Oil & Gas Gun Furnace Operation

Procedures for operating oil and gas gun furnaces, including sequence of operation.

Furnace Controls and Functions

On-Off Switch

Description of the primary switch for controlling electrical power to the furnace.

Limit Control

Explanation of high temperature safety limit switches and their function.

Gas Valve Functionality

Details on the 100% shut-off gas valves used in M1 series furnaces.

Roll Out Switch

Information on the manual reset safety switch for furnace protection.

Oil Burner Primary Control

Function of the primary control for oil gun furnaces, monitoring safe operation.

Summer Cooling Operation

How the furnace operates in cooling mode with A/C ready models.

Service Guide

Burner Adjustments

Factory settings for burner adjustments and checks required during installation.

Combustion Air Adjustment

Importance of adequate combustion air and how to adjust the air shutter for optimal burning.

Gas Conversion

Atmospheric & Direct Ignition Furnaces

Procedure for converting atmospheric and direct ignition furnaces from natural gas to LP gas.

Troubleshooting

Standing Pilot Model Issues

Troubleshooting steps for standing pilot models, including burner not coming on or pilot issues.

Troubleshooting Direct Ignition Furnaces

Burner Motor Not Running

Diagnosing issues when the burner motor does not run during a heating call.

Blower Runs, No Flame

Troubleshooting steps when the combustion blower runs but there is no flame.

Ignitor Not Heating Up

Steps to diagnose ignitor issues when the control module is powered.

Flame Ignites, Burner Locks Out

Troubleshooting causes for main flame ignition followed by burner lockout.

Burner Short Cycling

Diagnosing short cycling issues related to thermostats and limit switches.

No Main Gas Flow

Troubleshooting steps when there is no main gas flow to the burner.

Insufficient Heat Output

Diagnosing issues causing insufficient heat output when the burner is operating.

Troubleshooting Oil Gun Furnaces

Burner Fails to Start

Steps to troubleshoot when the oil gun burner fails to start.

Burner Locks Out on Safety

Diagnosing burner lockout on safety with indicator light status for Honeywell/Beckett controls.

Maintenance

Homeowner Maintenance Tasks

Routine maintenance for homeowners: return air, filters, seasonal checks.

Serviceman Maintenance Checks

Periodic service recommendations for servicemen at the start of the heating season.

Additional Oil Furnace Maintenance

Specific maintenance for oil furnaces by qualified contractors.

Optional Accessories

Air Conditioner Compatibility

Considerations for installing an air conditioner with the furnace.

Optional Add-On Air Conditioning

Information on NORDYNE add-on central air conditioning systems.

Wiring Diagrams

High Altitude Orifice Sizes

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