Question about Heating & Cooling

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Why does the pilot burn perfect before igniting the burners, then stutter while burners are on and go out after burners shut off?

I replaced the gas regulator, no fix. I replaced the pilot thermocouple assembly, still no fix. had pressure checked, good. had already cleaned lines and burners. only thing left to replace is thermostat gas valve assembly.

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  • Brad Brown Nov 21, 2014

    Hi david goss, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Make, model and type of fuel?

  • david goss
    david goss Nov 22, 2014

    it is a vanguard log base assembly model VSGF28PTC propane fueled

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  • Expert
  • 148 Answers

If this happen when blower on your might have leak in heat exchanger

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

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SOURCE: Coleman Propane Furnace Good pilot light but feed/ignite main burner

If you have a volt ohm meter take the two leads off the gas valve and ohm out the connection should have resistance for the coil. You said you have 12 volts from the thermostat white and red in the heating mode you should have minimum 26 volts. If you want to check the transformer should have 28 volts. Almost sounding like the transformer is getting weak. You can get parts for a 20 year old unit at any HVAC parts house. Try Washer Specialties here in Wichita Kansas they are on the web. Lowes even carries Transformers. Has to be rated 120 volt primary side secondary side 24 volts and 40 VAC.

Posted on Nov 24, 2008

Therinnaiguy
  • 1420 Answers

SOURCE: Laars boiler pilot light is blown out when burners shut off

Time for a cleaning and gas pressure test.

Posted on Dec 05, 2008

  • 24 Answers

SOURCE: pilot light won't stay lit.

most common cause of the described symptom overheating the thermocouple! a thermocouple produces millivolts of electricity based upon a differential of temperature between the tip and the base. If it gets too hot it will not work correctly. If the pilot flame is too large or the main burner flame is contacting the thermocouple or the thermocouple is too cheap or old all can cause this issue.

Posted on Dec 18, 2008

  • 2514 Answers

SOURCE: cozy gravity one sided wall heater...pilot won't

how by extending the duct work will it make the gas valve work ?

if the pilotkeeps going out clean pilot jet , or if the power unit has gone in the gas valve then you would have to change the valve , don't get the flue bit ?

Posted on Feb 24, 2009

  • 5 Answers

SOURCE: I have a GE (Rheem) SmartWater SmartShield Sensor gas cut off

The click you hear is the gas valve shutting off flow. It does that because the thermocouple (a rod sticking into the flame of the pilot) voltage drops, usually below 13 millivolts or so. Might be a loose connection from thermo to valve body (should be finger tight plus 1/4 turn) or a bad thermo ($13 at Lowe's). Good Luck.

Posted on Dec 04, 2009

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Slant fin boiler galaxy natural gas, pump starts and runs. Igniter comes on . Pilot lights. Burner lights. Runs for seconds. Burn shuts down. Igniter starts pilot light, pilot goes out and on and on


The flame sensor, which is located in front of one of the burner flames is probably oxidized and needs cleaning or replacement. If the unit can't "sense" the flame, it will continue to cycle.

Jan 22, 2017 | Slant Fin Heating & Cooling

1 Answer

My pilot stays on on my propane furnace but will not light up


The Little Giant units use a Unitrol gas valve very similar to a water heater in the home. #1,urn the Unitrol gas valve to the "PILOT" position to ignite the pilot. Depress the plunger and hold it down then push the spark igniter button until you can see the pilot flame ignite.
You have a lit pilot so this is not a problem for you.
The pilot light stays on continuously by design.
Once the pilot flame is established, you then turn the on/off/pilot valve to the "ON" position and set the thermostat to the desired temperature range., it should then fire its main burner until the desired temperature is reached. Once the temperature is reached, the main burner will shut off and the heater will go into a standby mode with the pilot flame still burning.
If you have turned the pilot valve to on and set the temperature high, it should come on, if not a new gas valve is required, they can be very difficult to replace due to rust.and most cases require a new unit,

Mar 19, 2015 | Unitrol Propane Heater Valve - Little...

1 Answer

RHFE Rinnai 551FT gas heater is not working after 7 years


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).
If the flame flickers, adjust the pilot (see below).
If there is an exploding sound when the burner ignites, adjust the pilot to a higher setting and clean the pilot orifice and the burner ports.
If the burner takes more than a few seconds to ignite, clean the pilot orifice and adjust the pilot light.
If the burner flame is uneven, clean the burner ports. If the burner flame is very yellow, clean the burner; open vents in the furnace room to provide more air; adjust the burner air shutter.
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:
  1. Hold the control knob to pilot and light the pilot as above.
  2. Unscrew the thermocouple fitting with an open-ended wrench.
  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.
  5. If the multimeter shows a reading besides zero, the thermocouple is functioning. Replace the thermocouple tube.
  6. If there is no reading, you will need to clean or replace the thermocouple following steps 7 through 11.
  7. Release the control knob and shut off the main gas valve on the gas-supply pipe that leads into the burner. Shut off power to the burner at the electrical service panel .
  8. Remove the thermocouple from its mounting bracket.
  9. Wipe the combination control clean and install a new thermocouple, tightening it by hand, then give it a one-quarter turn with a wrench.
  10. Insert the thermocouple into the pilot bracket, being careful to not crimp the tubing.
  11. Turn on power to the furnace and relight the pilot (above).
Adjust an adjustable burner air shutter:
  1. Set the thermostat to its highest setting to keep the burner running. Once the furnace has heated up, remove the burner access panel and loosen the locking screw.
  2. Open the shutter by turning it to the right until the blue base of the flame appears to lift slightly from the burner port surface. Then close the shutter until the flame reseats itself on the surface.
Clean removable burner tubes and ports:
  1. Shut off gas and power to the furnace.
  2. Unscrew or loosen and remove the tubes from the supporting bracket.
  3. Carefully clean the tubes with a brush or vacuum, making sure not to damage the burner ports.
  4. Use a stiff wire to clear any debris from clogged ports.

Sep 30, 2012 | Heating & Cooling

1 Answer

MAIN BURNER SHUTS DOWN JUST AFTER IGNITION FLAME RODS TESTED VENT CHECKED


The Thermocouple or Thermopile has failed and needs to be replaced. The Thermocouple is a safety feature that keeps the pilot burning if all operations of the gas valve are safe. If the pilot burns, the burners will light. The Thermocouple shuts off the gas control valve if the pilot goes out.

Mar 08, 2011 | Heating & Cooling

1 Answer

My whirlpool gas range is getting gas and is clean but will not ignite.


Not knowing whether you have an electric ignition or pilot I will make suggestions for both.
Electric -
There is a thermal sensor that detects if it hot or lit. So if this sensor is bad or shorted it will not try to ignite, however if it is every burner / oven device, then its probably the computer that controls the igniter.
Pilot -
Typicaly the piloted gas stoves will not supply gas to the burners / oven if that pilot is not burning, however there is a sensor similar to the on on the electric ignition that lets the stove know if the pilot is lit. Unfortunately this sensor is not electric in almost all cases and is not easy to replace.

If you have the parts list, this sensor will be called a thermocouple usually in both types, but can be called other things. I would go with this and if all else fails replace the whole ignition system (electric) or pilot valve (piloted).

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1 Answer

O'Keefe & Merritt Contempo Gas Stove Oven won't light


Probably needs the ignitor replaced. http://www.handymanwire.com/ubbthreads/showflat.php/Cat/0/Number/408747/an/0/page/332

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2 Answers

Gas heater won't ignite


I agree. Either the pilot flame is dirty and is not making good contact to heat up the bi metal strip on the pilot assembly, or the pilot assembly is defective. 90% of the time if you clean the pilot orfice and the pilot burner it will take care of the problem

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1 Answer

Propane patio heater ignition problem


I would change the thermocouple and here is why:

The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close. Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners

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you ignitor is going out you will need to replace it the ignitor needs to draw a min of 3.2 amps in order to open the gas valve coil if short of this it will not open at thimes it may just have enough to open

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