Question about Mr. Heater Natural Gas Garage Heater - 45,000 BTU

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I have a 75,000 btu mr heater and the spark ignition doesnt work . do i have a bad circuit board?

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  • Mr. Heater Master
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Hi clean the flame senser blow the dust out of the heater check the fan switch might be dusty jump out pressure switch see if that helps

Posted on Feb 02, 2010

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I s this spark ignition ? if so check out the igniter see if it is cracked ,it should send a signal back to the box and the stop sparking

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Possible pilot light issue. Seems to be an electronic ignition. The striker is damaged or missing. check any flow control valves, circuit breakers or special instructions re use of the pilot/starter/striker.

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Mr. Heater Big Maxx 75,000 BTU Heater will not ignite. Manufacturer says it's possibly a faulty chipboard. After replacing the chipboard with a new unit shipped from the manufacturer the unit still will...


Is the circuit board giving you a blinking error code?
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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1 Answer

We have a 75,000 Natural Gas Mr.Heater


Make sure you are using the R and W terminals both at the heater as well as at the thermostat. Try jumping the wires together without the thermostat and see if the unit starts. If it does, bad thermostat. If you continue to get the error code, you may have a bad board.

Jan 16, 2010 | Mr. Heater Natural Gas Garage Heater -...

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Mr. Heater Natural Gas Garage Heater - 45,000 BTU. Power 120 volt and 24 volt good. Thermostat calling for heat, but nothing happening??


Check for a fuse either in-line or on the circuit board. There should be 24 volts going to the thermostat. If not, you have either a bad transformer or a bad thermostat wire. Jump out the terminals that the thermostat wires are connected to. This should force the unit to fire. If not, bad circuit board.

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Thermostat call for heat but the heater doesn't ignite


what number of flashes does the led light on the circuit board show for an error code?

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