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The furnace kicks on, blower continues to run but flame goes on and off intermittently during cycle

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Hi,

Here is a tip that will help you try to figure out why your furnace is notworking.

BasicFurnace or Heating System Troubleshooting

heatman101

Posted on Apr 01, 2011

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  • Weather King Master
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Hello, sounds likebyou have

Posted on Apr 01, 2011

  • Robert Apr 01, 2011

    Hello, sounds like you have a dirty flame sensor, turn off power to furnace, remove flame sensor and clean with steel wool. The flame sensor is metal rod on the opposite side of tne ignitor.

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1 Answer

Tractorman44 thanks but misunderdstood husband! When thermostat turned up the fan comes on before flames ignites. Plenum heats and furnace runs.


If the fan comes on first, then the flame ignites, it USUALLY indicates there is a problem in the ignition process of the furnace. Most new manufacturers have the adjustable 'time off' sequence for the blower, and most initiate a call for the blower to run within a pre-determined amount of time AFTER a call for heat has been established. ALSO, and this is where I think the problem is, the ignition sequence starts immediately upon a call for heat. If there is a heat ignition failure, it will attempt a restart. USUALLY, they allow 5 restarts within a certain timeframe then the circuit board locks out the heat sequence until it is reset by cycling the power or cycling the thermostat manually.

What I think is happening with yours it that your ignition sequence is experiencing a 'flame failure' upon a call for heat....then it re-establishes the ignition sequence, which takes another 30 to 45 seconds. During this time, the blower automatically starts (because the allotted time has expired) and blows COLD air because of the initial flame failure. In the meantime the ignition sequence establishes a flame on the second or possibly the third try and then you feel the warm air.

IF this is the case, ultimately what will happen is that the furnace will continue to experience 'flame failure' and eventually fail to the point of 'flame failure lockout' and you will have no heat, but the fan could possibly run continuously.

At any rate, without being able to be there to troubleshoot and test components physically, this is just a calculated and reasonably reasonable guess. What it is telling you is that you probably need to contact a reputable, reliable service organization to give your furnace a good going over before it lets you down on a good cooooold night!!!

I hope this helps you understand the basics of what happens within the system and bear in mind, this is a 'generic' sequence and possibly NOT the exact sequence of your particular furnace.

Oct 01, 2015 | Heating & Cooling

1 Answer

Furnace won't stay lit. Intertherm Model M2RC-080A-16BN. Ignightor glows, flame starts and after a few seconds the flame shuts off. Then it starts the cycle again. It goes thru this cycle a fe


It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.

Nov 20, 2014 | Intertherm Heating & Cooling

1 Answer

Furnace kicks on and heats up for 5 min. then will shut down - no flame - main blower will run for a few min and then the whole cycle will start again. flame sensor checked ok with meter at approx 5.0


What is your temperature rise during the 5 minutes it does run? Could be overheating and kicking out on limit switch. Watch the diagnostic light for a code. (3 blinks means this, 4 blinks means that etc.)

Jan 09, 2014 | Amana Heating & Cooling

1 Answer

Fan is blowing in furnace, thermostat raised 10 degrees over ambient temperature and not heating home. Red and green lights blinking intermittently on control board.


Cycle the power first & see if the furnace goes through the normal sequence of order. On a call for heat, the vent inducer motor should turn on and the pressure switch should prove negative draft in the heat exchanger. the board then should power the ignition phase whenter it is hot surface ignition, or spark, you should hear a spark or see the orange glow of the ignitor & the gas valve is timed to turn on. If you have proper gas to the furnace, it should allow the gas to flow through the gas valve & ignite the flame. Once the flame is ignited, the romote or local sensor should sense the flame & the blower then kicks on from the time delay in the board. If you don't have any ignition, then something is wrong with either the ignitor, ignition module, pressure switch, or you have a manual limit that is tripped(this looks like a small 1/2 inch disc with a reset button on it) If you have ignition & the flame lights, but drops out, then your flame sensor is dirty & needs a touch of sand paper to clean it up(this looks like a 3 inch metal rod opposite of the ignitor) Make sure your power is off when you clean the sensor if you need to. Also if there is no ignition & the vent inducer motor is running... if it is hot surface igniton, there is a molex plug on the leead wires to it- disconnect & check continuity- should be under 110 ohms.

Sep 03, 2011 | Goodman GMS90703BXA Heater

1 Answer

The pole buiding 24 in hanging Dayton sometimes the blower comes on like after 5 minutes after everything else kicks in and sometimes like when its supposed to and sometimes not at all?? All the electric...


I'm not sure whether this is a gas unit or not. With many gas heaters, the blower comes on when the heat exchanger gets hot enough and goes off once the heat exchanger cools. Other things are happening before the blower goes on. The blower is normally controlled by a "fan control thermostat". This stat actuates the blower when the furnace is hot enough so that cold air is not being blown around and allows the blower to run until the furnace cools enough to get out the remaining heat after the flame shuts off but not so long to again allow cool air to blow around. If this fan control is malfunctioning, you will get erratic runs from the blower or the blower may not run at all or run long or continuously. The fan control is the first thing to check.
Gary

Jan 31, 2011 | Dayton Gas Furnace Heater

1 Answer

I have a Goodman GMS90904 and it's been working great for about four years. All of the sudden, i realize it's running a lot, so upon inspection, what's really happening is that it's firing up, the flame...


Even though this furnace is newer, I highly suggest a licensed tech make sure that this problem is not due to a breach in the heat exchanger causing the flames to go out when the fan comes on. That said, first check that the filter is clean and then check the flame sensor rod. If there is "chalky" build up on the end remove it with sand paper. If this cures the problem then purchase a new flame sensor for a more permanent repair.

Nov 28, 2010 | Goodman GMS90703BXA Heater

1 Answer

Furnace blower fan problem


Hi check out the fan control switch could be dirty itsounds like this is nit cutting to let fan run also check setting fan off fan on , temp rise and fall

Feb 06, 2010 | Heating & Cooling

3 Answers

Ruud heater will not light consistently


Your furnace is going into a lockout condition, cycling the power resets the circuit board and it starts over. I will need to know approximate age and model of your furnace, it sounds like you have need to clean the flame sensor rod. However i need to know what i am working with.

Dec 18, 2008 | Ruud UBHC Air Conditioner

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