Question about Procom ML300HGA Heater

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Burner won't light

This is brand new, I just had it professionally installed. The pilot lights fine but when you turn the knob to light the burner the pilot goes out and you have to relight the pilot. I did this about 10 or 12 times and then it finally lit the burner one time and hasn't worked since. What is wrong??

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  • Jigsaw Nov 08, 2008

    The pilot has been on for 2 days. It stays on fine.When you turn the knob past the ignite mode, it clicks and you hear the gas, then as you are turning the knob to ignite the burner the flame dies down and clicks off before you can turn the unit up. This unit has a thermosat so I checked to see (even though the pilot had go out) when you turn the knob up you can hear the gas hissing. So the problem in the burner you are saying?

  • Jigsaw Nov 08, 2008

    Thank you, I will call the tech on Monday.

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There is a termocouple that controls the pilot, when the termocouple is faulty, the pilot does not stay on.

Call back the technician.

Posted on Nov 08, 2008

  • Ginko
    Ginko Nov 08, 2008

    First ensure that on ignition you are holding the button long enough to warm up and keep the pilot on.
    When you are firing up you need to hold the button for some time, until the burner gets hot, or the flame will turn off, that is normal.

    If there is no way to start it even holding the button for five minutes, then the burner is faulty.
    In this case, the gas valve has a termocouple, that turn off the gas valve.
    When the pilot goes off it is often a faulty termocouple.
    Testing and replacing the thermocouple is not a job for beginners.
    You need to test the termocouple at different temperatures, and there are many safety issues involved.
    If there is a fault the job must be done by a technician.


  • Ginko
    Ginko Nov 08, 2008

    I told you.

    There is a thermocouple, when it is faulty it can cut down the gas, then when you reignite you have gas because valve is fine.

    A thermocouple is a device that is sensible to temperature, and when heated generates electricity. The electricity opens a electro-magnet controlled valve that keeps the pilot alive and the main burner opened.






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SOURCE: Burner won't light

I left it off for a couple hours and it fired back up.

Posted on Nov 09, 2008

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see this steps and fix it. God bless you
.
If there is no heat, check the electrical service panel for a burned fuse or tripped breaker. Relight the pilot light (see below).
If there is not enough heat, adjust the burner air shutter (see below); and clean the burner ports (see below).
If the pilot light does not light or does not stay lit, clean the pilot orifice carefully with a toothpick, test the thermocouple and replace it if it is faulty (see below).
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To light the pilot on a standing-pilot (always on) ignition system, follow the lighting instructions located near the control. Otherwise, try these steps:
Light the pilot:
  1. gasfurnace1.jpg Press and hold the pilot control knob to start the pilot. Set the control knob to the pilot position. Hold a long match under the pilot gas port.
  2. Press the control knob; the pilot should light. Hold the control knob down until the flame is burning brightly (about 30 seconds). Release pressure on the knob, and turn it to the on position.
  3. If the pilot goes out when you release the control knob, try relighting, holding the control knob down longer. If the pilot again goes out, check the thermocouple (below).
Adjust the pilot:
  1. Remove any cap covering the pilot adjusting screw on a combination control.
  2. Turn the adjusting screw counterclockwise to increase the flame or clockwise to decrease it. It is correctly adjusted when the flame envelops the thermocouple bulb by 1/2 inch and appears dark blue with a small yellow tip.
Test and replace a thermocouple:
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  3. Set a multimeter to the DVC (lowest voltage) scale.
  4. Clip one multimeter lead to the end of the thermocouple tube nearest the pilot and the other lead to the fitting on the other end of the tube.
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  10. Insert the thermocouple into the pilot bracket, being careful to not crimp the tubing.
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1 Answer

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1 Answer

Burner won't light


I left it off for a couple hours and it fired back up.

Nov 08, 2008 | Procom ML300HGA Heater

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