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Troubleshooting Monitor 2400 Heater Issues and Solutions

A Monitor heater is a forced-air home heating system that runs on oil. The Monitors are frequently found on the lower level of a house or in the basement, but not because they are unattractive; they are highly appealing gadgets. They have the appearance of a giant space heater, but the top has a control panel with digital temperature settings, an on/off button, and a clock.

Regrettably, all monitor heaters are no longer being produced, and only a handful are available. The Monitor 2400 is one of the Monitor heaters likely to be seen in some homes. This heater uses K1 kerosene. It is meant to be incredibly efficient and keeps up to 2000 square feet of space comfortable while using only 1.5 to 2.0 gallons of fuel each day. This energy-saving Monitor 2400 direct vent kerosene supplementary heater saves 15% on heating costs. This equates to hundreds of dollars annual savings.

However, just like anything else in life, the Monitor 2400 heater also has its problems. This article will walk you through the Monitor 2400 heater issues, their causes, and solution.

Monitor 2400 Heater Problems and How to Solve Them

Monitor 2400 Heater Issues

The Heater Does Not Go on With Operation Switch

When using a Monitor 2400 Heater, this is one of the most common problems you’ll run into. There are various reasons why the heater won’t turn on when the operating switch is turned on. The following are some of the factors at play:

  • Out of fuel
  • Water in the fuel
  • Igniter failure 
  • Clogged fuel strainer 
  • AC cord is unplugged from the wall outlet 
  • The timer is set to auto


  • Ensure that the plug and power source are both in good working order.
  • Press the auto button once more.
  • Try to reset the circuit breaker
  • On the lower right-hand side of the cabinet, press the fuel set lever.
  • For an inspection or replacement, contact your MPI dealer.

The Automatic Timer Fails to Start the Heater

This is another common issue with the Monitor 2400 Heater. The leading cause for this include:

  • The operating switch is in the “off” position.
  • Incorrectly set timer.
  • The timer is set to manual mode.
  • Power outage.


  • Turn the operation switch on
  • Check the programming for automatic operation
  • Press the auto button to ensure that your timer is in auto mode
  • Confirm if there is a power loss

Heater Extinguishes After Lighting

The heater extinguishing after lighting is another problem one is likely to encounter with the Monitor 2400 Heater. The common causes for this are:

  • Out of fuel
  • Air pocket in the fuel line
  • Poorly located heater sensor
  • Sudden changes in room temperature
  • Poor air movement


  • Check to see if you are out of fuel
  • Try to relocate your sensor
  • Add a room fan for better air circulation
  • Contact your Monitor dealer

Heater Changes from Automatic Operation to Manual Operation

Monitor 2400 Heater Issues

The main reason that can cause your Monitor 2400 Heater to switch from the automatic mode to the manual mode is the power loss.


  • Check to see if there is a loss of power

Soot on the Inside of the Burner Window or the Exhaust Ports of Fuel Pipe

The leading cause for this is the failure of the combustion fan or the obstruction of the combustion air intake system.


  • Check for blockages in the air intake system and the air supply elbow. If required, clean with a brush and reconnect with care.

Poor Flames, Combustion Sounds, and Soot at the Rear of the Heater

This mainly occurs if you have a loose fuel pipe.


  • Allow your heater to cool down and then tighten all the connections completely.

Frequently Asked Questions

How Do You Clean a Kerosene Monitor Heater?

Install a cardboard-lined container under the fuel strainer lid on the lower right side of the heater. Remove the fuel strainer cover screws and allow the extra fuel to drop into the container. Remove the fuel strainer and clean it with clear, fresh kerosene.

Take this into account: how can you clear soot from a kerosene heater?

The steps for removing the soot are outlined below:

  • To remove as much carbon from the wall as possible, start by vacuuming it.
  • After that, use a soft sponge to clean the area.
  • Add 1 tablespoon TSP in 1 gallon of water
  • Using the solution, dampen a soft cloth and clean the soot-stained area.

Can You Burn Diesel in a Monitor Heater?

Pouring diesel fuel into your Monitor heater’s tank can hold you over until a delivery arrives if you’re on the verge of running out of heating oil or if you’ve already run out. This will not cause any harm to your heater.

 However, it is essential to note that regular gasoline should not be used in a Monitor heater. It will harm your furnace as well as cause other issues.

What is the Difference between K1 kerosene and regular kerosene?

The sulfur level of K1 kerosene is the significant difference between it and regular kerosene. K1 kerosene, the most often used form of kerosene, is very pure with minimal sulfur levels. K2, on the other hand, can have up to ten times the sulfur of K1.

What is the Extremely Energy Efficient and Comfortable Alternative to a Monitor Heater?

If you have a Monitor heater, you might want to look at a Mitsubishi ductless split system as an option. It’s undoubtedly the most excellent Monitor heater alternative. It has numerous advantages and is simple to set up. Many people who have switched to a Mitsubishi ductless split system have been blown away by its energy efficiency. They appreciate the high degree of comfort it delivers while requiring so little maintenance and space.


Although monitor heaters are no longer manufactured, they can still be found in certain households. We hope that this post has given you all of the information you need regarding Monitor 2400 heater problems and how to fix them.