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The problem would be in the inducer or combustion motor not starting up and running. This is a safety or one of several in you're system. When the fan comes on, the draft sends air to a switch telling you're unit that fan is on and ready to fire up.If the fan fails, no heat.Check for voltage to the fan motor. Even though it is free doesn't mean that it will work anymore.If there is no power to the motor, on a call for heat, you need to look at the schematic and find out where this motor gets its power. If there is power, remove it and try and find a dealer online or near by to where you can get one.It has to be working. I am surprised the burners come on at all. Good Luck Wayne, and please let me know what you find out. Sincerely, Shastalaker7
You have some kind of fuel problem. When you mention 5 gals of fuel, that leads me to think you need more fuel ( more pressure). If you have a large tank and only have 5 gals you may no have enough head pressure to push the fuel through the line and all the filters in the system. That being said the Monitor 30 is the oldest vented heater around. Parts have not been available for 15 years. The thing that scares me about the M30 is the flame safety circuit. I don't think it is adequate. If you rely on this heater to keep pipes thawed I would get a new Monitor or Toyo.
When you try to light the heater do you ever hear a thumping noise? If so, you have a fuel delivery problem. If you never heat the thumping noise you have a fuel pump or air safety switch problem. If it's been snowy you could have a covered flue pipe. This will cause the fuel pump not to come on. If your Monitor is your only source of heat I would be looking for a local repair guy that knows the Monitor heater.