Question about Maytag MDG2706A Gas Dryer

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Flame shuts off after five seconds

The igniter turns on, then the flame goes on for about three seconds and shuts off. After around fifteen seconds, the flame goes on again and again shuts off, and so on and so on.

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  • Anonymous Dec 05, 2008

    I replaced my thermocoupler but still not working, flame won't stay lit. do you know y?

  • Anonymous Mar 22, 2009

    Flame dont start at all

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HI! I BELIEVE THE PROBLEM YOU ARE HAVING IS CAUSED BY A PART CALLED THE THERMOCOUPLER. THIS IS A SAFETY DEVICE THAT SHUTS OFF THE GAS IF THE FLAME GOES OUT, BUT IT NEEDS HEAT TO MAINTAIN THE PROPER CIRCUIT. THIS MEANS THAT THE THERMOCOUPLER IS BAD AND NOT HOLDING THE GAS VALVE OPEN AS IT SHOULD. IT IS A SMALL THIN ROD TYPE THING THAT WILL BE VERY CLOSE TO THE PILOT OR IGNITER AND IT HAS TO FUNCTION PROPERLY TO ALLOW THE GAS TO CONTINUE TO FLOW. WHAT IT IS DOING IS GETTING JUST WARM ENOUGH TO OPEN THE GAS VALVE, BUT THEN THE IGNITER STOPS AND THE BAD THERMOCOUPLER COOLS AND TURNS YOUR GAS OFF. YOU NEED TO REPLACE THE THERMOCOUPLER AND YOU SHOULD BE BACK TO WARM CLOTHES IN NO TIME. HOPE THIS HELPS YOU. ANY QUESTIONS, JUST REPLY AND I'LL HELP MORE.

ARCLIGHT1217

Posted on Nov 02, 2008

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The heat turns off after 3 seconds of flame.


There is a flame sensor failure.

Here is the ignition sequence for a furnace. This will help you understand what is happening/not happening.

Thermostat2.gif calls for heat.

draft inducer motor (DIM) starts drawing draft through heat exchanger.

Pressure switch detects proper operation of DIM, and sends signal to board to begin ignition.
(it detects negative pressure)

Ignitor starts ignition attempt and gas valve sends gas to burners.

Upon ignition, flame sensor detects flame and sends signal to board stopping ignition sequence and continuing gas flow for heat mode operation until thermostat is satisfied.

During this sequence the blower motor is brought on, and by using a series of temperature limit switches, the system assures that the unit is operating properly.
(If the blower is not operating, or the airflow is inadequate, the heat exchanger will overheat and trip one or more temp limit switches.)

There is also a "rollout" switch that detects improper flame pattern "rolling out" into the controls compartment.

Now, to apply that to your situation.

If the flame sensor does not sense flame, it shuts down the furnace to prevent a dangerouse gas build up.

With most modern glow coil ignition systems you have one of two failures.

1) the flame sensor is bad and needs to be replaced.

2) the control board is not proccesing the signal from the flame sensor and shuts the system down. In that case the board would need to be replaced.

There is a possibility that a temperature limit or roll out switch is breaking the curcuit, but that would be quite unusual to happen consistantly at three seconds.

Unless you have the ability and tools to test the snesor and board, the next step would be to replace the sensor first, and then the board if that does not fix it.

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A Make and Model number of the furnace not the thermostat will help but I can walk you thru the operation of a typical furnace. It sounds to me that the burners are igniting properly but the flame sensor is not sensing the flame and shutting down the system. You will need to find the sensor and clean it and check the wire from it to the control board. Typically, the flame sensor is found at one side or the other of the burner box. It is a small probe that the flame hits. Depending upon your model it may have a small wire attached to it leading back to the control. Or it may be part of your auto-pilot assembly. ? At any rate, you will need to get to it and very delicately brush it off. Then inspect the flame channel. This is a trough area where the flame travels to ignite all burners. Over time, they tend to fill with rust and debris. Take a small screwdriver and run the blade down the trough. Inspect the wire that goes from the flame sensor to the control board. Make sure it is not frayed or broken or shorting out and that the connection at the board is good.

Beyond that, it's time for a technician to come.

Let us know the Make and Model of the furnace (found inside the furnace cabinet) and maybe we can help you further.

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