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No one does furnaces better than Intertherm – thanks to their high-gas efficiency. But, what happens when your heating system encounters an error mid-winter? That's why we've assembled an array of Intertherm furnace manuals for your convenience – so you're prepared to tackle any furnace problems you might run into with ease.

Intertherm Furnace Manuals

It can sometimes be difficult to find the correct instruction manual for your device, particularly for older, discontinued models.

Use the search bar below to find your specific Intertherm Furnace Manual. You can enter the model number, name or description. We’ve also included images to help.

If you have a manual you would like to list, submit it here. Or, if your model is not listed, leave a comment below.

All imagery and manuals are copyright © Intertherm. Please visit for the most up to date manuals and product information. You can read our DMCA policy here.

Model Image Model ID Description Document Updated Downloads
CMF2 Series
Intertherm Mobile Home Furnace 2010
Document(s) Updated: 2010
M1 Series
M1 Series Furnaces 2020 Installation Manual
Document(s) Updated: 2020
Series M1B, M1G,M1M & M5S
M1B, M1G, M1M
Downflow, DirectVent (Sealed Combustion) Forced Air Gas & Oil Furnaces 2011 Installation Manual
Document(s) Updated: 2011
E4 Series
Electric Furnace 2016 Owners Manual
Document(s) Updated: 2016
MG1 Series
Downflow, Direct Vent (Sealed Combustion) Forced Air Gas Furnaces 2019 Installation Manual
Document(s) Updated: 2019
M1B, M1M & M5S Series
Downflow, Direct Vent (Sealed Combustion) Forced Air Gas & Oil Furnaces 2015 Installation Manual
Document(s) Updated: 2015
DMSTNM-2, DMPFNM-2, P/N 800,021M
Vented Gas Fireplace Heaters – Direct Vent 2002 Installation Manual
Document(s) Updated: 2002

How to find your Intertherm Furnace model number?

We discovered many people have a tough time locating their Intertherm furnace's model number during our research – which is understandable. You see, where a furnace's model number is located may depend on the manufacturing company.

Although, generally, your model may be found on a sticker on the inside wall panel of your furnace – closer to the bottom. However, some furnaces may also have the sticker placed on (or near) the front inside door panel of the furnace.

Intertherm Furnace Instructions

Here's an overview of the information you will get from your Intertherm furnace manual

  • Safety Information
  • General Information 
  • Combustion & Air Venting Requirements: deals with details like direct vent installation, vent pipe length & diameter, outdoor terminations for horizontal and vertical venting, etc. 
  • Circulating Air Requirements: includes information on supply and return air connections, among others.
  • Furnace Installation: This section talks you through what's required before installing the furnace and how you can go about the installation itself. 
  • Gas Supply and Piping: covers topics like leak checks, high-altitude applications, gas pressure adjustment, etc. 
  • Electrical Wiring: If you're looking for info on low voltage wiring and thermostat/ low voltage connections – then this is the part you want to start with. 
  • Start-Up and Adjustments: includes particulars about the pre-start checklist, start-up procedures, and verifying supply air/ burner operations. 
  • Operating Sequence: Talks about the heating and cooling cycle and fan mode. 
  • Maintenance: lists out how you can look after the different components of the furnace, like air filters.

Intertherm Furnace Troubleshooting

All Intertherm furnace manuals feature a troubleshooting section that aims to make your life simpler by listing out solutions according to standard errors. It would be best if you remembered that the troubleshooting section's instructions might vary from model to model due to the difference in capabilities – which is why it's essential you pick the right manual.

Here are some of the problems listed in the manuals.

  • High Gas Bills
  • Burner Motor won't Run – T-stat Calls for Heat
  • Combustion Blower Runs – No Flame
  • 120 VAC Is Available At AMP Plug – Ignitor Does Not Heat Up
  • Control Module is Powered – Ignitor won't Heat Up
  • Main Flame Ignites – Burner Locks Out
  • Burner Short Cycling – Thermostat Calls for Heat, Limit Switches Closed
  • 24 Volts Supplied To Gas Valve During Ignition – No Main Gas Flow
  • Burner Operates – Insufficient Heat
  • Burner Flame Without Motor Running
  • Circulation Air Blower Will Not Operate Even Though The Burner Does Operate
  • Burner does not start with a call for heat
  • Burner starts & then locks out on safety with Honeywell R7184 LED indicator flashing ½ second on, ½ second off. For Beckett 7505 control, the red LED will flash
  • The burner will not start and the LED indicator is flashing at 2 seconds on, 2 seconds off for R7184 (or green LED is flashing for 7505)

Types of Intertherm Furnace

Intertherm manufacturers a series of HVAC products, but their furnaces can be distributed among three categories – oil, gas, and electric. 

Oil Furnaces by Intertherm feature multiple-tube heat exchangers or a high-efficiency drum that offer a longer shelf life. They also include Beckett oil burners for a uniform flame pattern. And, their sealed combustion system vents exhaust gas directly outdoors and draws in 100% outside air for the burner.

On the other hand, Intertherm gas furnaces are specifically designed for all sizes of manufactured and modular homes and can be installed in a utility room, enclosed closet, or alcove. Additionally, these furnaces also include heavy-gauge aluminized steel heat exchangers for long life and efficiency.

Electric furnaces are generally preferred by buyers, thanks to zero chances of carbon monoxide poisoning. Intertherm electric furnaces offer not only high quality but also dependability and safety. They include integrated cooling blower delay, multi-speed blowers for improved air circulation, and an appliance finish that promises protection against corrosion and rust. 

About Intertherm

Intertherm can boast of experience in the HVAC manufacturing industry that spans a century – which is incredible. The company's products include split systems, furnaces (oil, gas, and electric), and packaged systems.

What's more, Intertherm is the only heating and cooling manufacturer that happens to be certified in Demand Flow Technology (DFT). DFT is a quality-control process followed by manufacturing plants that helps reduce customer turnaround time and inventory investment.

More importantly, DFT ensures a quality checkpoint at various manufacturing stages to ensure little to no product failure.


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  • Jon Vanderpol
    Posted December 22, 2021 at 7:12 pm

    Looking for the manual/documentation for the FEH-015C

  • Melissa Lynn Anglin
    Posted January 31, 2021 at 10:28 pm

    I need a manual for the Intertherm model E2EB-012A

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