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Datton 3E402, rapid cycling ... burner on 42 seconds, then off; then fan on 12 seconds , then off; then cycle repeats. Just started this a few days ago. Thaks, Terrence

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Hi!!! you seem to have a bad flame sensor in your heater.Replace your flame sensor..Good luck..

Posted on Jan 03, 2009

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Outside unit runs for about 5 seconds then shuts off for a few seconds. It repeats this cycle.


Put in a 5 minute time delay. It is a two wire device in line with the contactor. Sounds like it is set to 75 turns of at 74 and repeats. The tstat should have a differential of 2 degrees as well.

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12 year old HE York diamond 90 furnace burners ignite for a few seconds but won't remain lit. Hot surface igniter then glows and burners again light momentarily. Cycle repeats several times before blo


The flame sensor can still be faulty, replacing that is the cheapest. Other issues could be a faulty control board (if available), a faulty gas valve, thermostat lossing call, or a safety/pressure switch problem. There are alot of variables and it really helps to have a meter to check voltage and continuity through-out the system.

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Hello, I have a Amana Air Command 80 model #GHI90A50, 22 years old. This furnace is on its third ingnition module (last one two yeras ago). The symptom I am trying to diagnose has been ongioing since this...


If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

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Compressor fan cycles on and off .1986 carrier mo#38eh0363300l


Usually compressors cycle on and off due to the low preasure switch which disconects the compressor when their is a freeon leak. Put the gages on it and see if the preasures are correct.

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1 Answer

Trane air handler cycling rapidly


Depending on the age of your Trane unit. The fan relay has a time delay. This is a solid state board on the relay. Most of the time they stick on or off. Check for loose wires. But start with relay.

Jun 03, 2009 | Heating & Cooling

3 Answers

Riello 40 F5 oil burner, on boiler, intermittently running


with a forced draught burner the fan motor would be checked via a pressure switch. if the pressure switch is not set correctly or the fan is too weak the contacts will not be made in the switch and the burner will lockout. if the damper is not open enough when the fan runs then the air supply will be too small for the switch to make. check to see if you have a capacitor on the fan windings if this is faulty then the fan will fail intermittently.

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1 Answer

Blower Motor cycles on & off


whats happening is thje heat exchanger is cooling off and cycling the fan off this is a normal occurance whenever the unit is first turned on.

Dec 22, 2008 | Heating & Cooling

1 Answer

The burners go out before the fan comes on


Replace your flame sensor, but before you do that, see if you can clean it with light wool, or emery cloth, or light sand paper. It's a metal rod that points in the current of your flame.

Dec 05, 2008 | Heating & Cooling

1 Answer

The burners go out before the fan starts


Replace the flame sensor, clean the burners to ensure you have a good clean burn pattern and the flame is properly reaching the flame sensor.

Look for a flashing LED and determine what the failure code is.

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