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Furnace elements turn off and on many times during a cycle

Reputable HVAC repairman replaced sequencer and that did not help. It still clicks and blows cold air for a while and then clicks and blows warm then hot air. He checked with his coworkers and they could not come up with another solution. It does this whether the fan speed is high or low. Also with the cover off giving it maximum return air. This started almost 7 years after I purchased the mobile home new.

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  • 571 Answers

There are Klixon high temperature limits in series with each element that will stop the voltage from going through to the element. Find out which one is klicking out, and replace.

Posted on Feb 21, 2014

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Posted on Jan 02, 2017

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SOURCE: fan motor slow on a/c

If the fan motor has a capicator it could be bad. A bad cap will pull the motor down. If there is no cap then the motor beatings could be going bad. this can be checked by matching the motor amps with the rated amps on the unit information tag.

Posted on May 18, 2008

tborn6
  • 700 Answers

SOURCE: Duo Therm Quick Cool A/C fan motor cycles from low to high

sounds like the motor is either wired incoirrectly and getting 1/2 power all the time or it is going to ground. check out the woiring real good and duse your ohhm meter to check for gounds.

Posted on Dec 21, 2008

solveditnow
  • 39 Answers

SOURCE: (HVAC) Furnace Not Igniting Quickly

Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

Posted on Jan 08, 2009

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2 Answers

I have a colman furnace one element stays on constantly can you tell me why


Furnace is the term we use for a gas system. I'm assuming you have an electric "air handler"(unit), and or has 1 element staying on, glowing red, and cycling on a limit. These elements are controlled by "heat sequencers", heat relays, and some older units used heat contactor's. This "switch" is stuck closed & must be replaced. I've also seen a direct short at the element itself, where the element has come apart, and a part of that element had touched ground. This completed the circuit and allowed the element the energize. Hope this helps! Its probably a stuck (closed), switch that's supposed to open when the tatat is satisfied.

Feb 21, 2017 | Heating & Cooling

1 Answer

My furnace wont turn off


Well Linda, is it the heat portion will not shut off or just the fan in the furnace that continues to run?? If the heat won't shut off, it will get uncomfortably HOT in your house, if its just the fan.....well, its just the fan.

More than likely its just the fan and it is running continually due to a stuck set of contacts in the control board or in the fan control board, if so equipped. If it is a furnace that is older than 15 to 20 years, it could be a mechanical relay that controls the fan directly off another control in the furnace vestibule that senses heat in the heat exchanger. If its an electric furnace, the first stage heat sequencer could be stuck closed causing continual fan operation and possibly one heat element is also energized. There are also several additional issues that could be the cause.

At any rate, its time to contact a reputable service entity to correct your problem. Good luck, Linda.

Dec 04, 2015 | Heating & Cooling

1 Answer

Why does electric furnace blow cool air


Lisa, you could have one or more of the heating elements not functioning. This could be caused by a number of reasons....a burnt wire or wires, defective sequencer or possibly even a staging problem within the wall thermostat. I think its time to contact a reputable service company to rectify the issue.

Oct 04, 2015 | Heating & Cooling

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

Where to look from here?


It sound like the limit switch is shutting off and not coming back in to play .

Mar 14, 2017 | Heating & Cooling

1 Answer

Heating elements


Heating elements in HVAC equipment uses sequencers to turn them on and off and decides how long they're energized, Not sure if you're referring to a space heater or what. Please be clear about the problem and equipment to get accurate answers.

Dec 15, 2013 | Heating & Cooling

1 Answer

Electric furnace will not turn off


Your sequencer is stuck. A sequencer uses a small coil to warm up the switch so that it will turn the electrical elements on one at a time instead of all at once. If they all come on at once the amp draw would throw the breaker. It is also desired to have warm air come out of the vents when the fan comes on. So how do they do it? With a sequencer:
themobilian_3091.jpg
A sequencer can have up to 4 stacks depending on the amount of coils are in the heater. Each coil on average has a value of 5000 watts. So what ya want to do is turn on a coil then after 30 seconds another coil then after 30 more seconds the fan and maybe another coil depending on your furnace size.
So in your case what is wrong? The sequencer bimetal disc inside it is jammed in the on position and therefore the heater stays on until you tun the breaker off. Replace the sequencer and party on!
themobilian_3092.jpg

Here is a page on sequencers that also features rewiring of an electric furnace

Oct 28, 2011 | Heating & Cooling

1 Answer

Furnace


Try to start the unit again and put your hand on the gas valve and feel if the valve clicks before the ignitor stops glowing , if it does click your valve is bad , I just changed one last Fri. with the same problem

Oct 28, 2008 | Goodman GMS90703BXA Heater

1 Answer

Self-clean not cleaning


I was wrong (I think).  the baking element probably was burnt out as the repairman said.  He replaced it and I thought selfclean still wasn't working.  In fact, I think I just had to give the self-clean function more time.  Also, I was judging by smell.  We have become used to a bad odor during self clean which was missing when it was broken and still missing after the repair.  Bottom line, the oven was clean after the baking element was replaced, sans smell.

Apr 19, 2008 | GE Profile JTP18 Electric Single Oven

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