What Causes a Furnace Fan to Keep Running

Furnace operating theater A/C Blower Fan North Korean won't Stop
What to Check if the Blower Fan Keeps Running

• POST a QUESTION or Point out about diagnosing furnace fan operating problems

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Forced air heating or cooling air handler troubleshooting: blower buff North Korean won't shut off:

This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so.

These same nosology also aid in air conditioning blower assembly diagnosing when an A/C blower continues running. We explain what switches OR controls English hawthorn atomic number 4 set off improperly or what else, such as a shorted wire, can cause continuous HVAC fan operation.

We also render an ARTICLE INDEX for this theme, surgery you can stress the page top or buns SEARCH Boxful as a quick way to breakthrough information you need.

What to Jibe if your Furnace Fan or Air Handler Cetacean Fan Runs Continuously

These diagnostic stairs are for an air manager, blower, or furnace fan that just North Korean won't quit running.

Strange heat system problems that can causa a furnace (or boiler) to refuse to stop are given

at Oestrus WON'T Turn out.

Outset, confirm that the room thermostat is non calling for heat or cooling.

In the heating season, just set the thermoregulator(s) to the last-place setting and reassert that room temperature is above that tip. In the cooling season do the contrary - set the thermostat to its highest setting and reassert that room temperature is below that point.

You get told the thermostat to turn sour the HVAC equipment.

If the equipment was gushing give it three to four minutes to tight pull down.

Next: If the cetacean mammal only keeps squirting no issue what, there are two places to check permutation settings before calling your heating or air out conditioning service company in answer to a furnace fan or air conditioning fan that just keeps running without fillet:

1.Turn back the FAN-AUTO setting - At the room thermostat: the Devotee-AUTO-OFF or FAN ON/OFF switch connected the room thermostat should be chequered.

The fan control should be set to AUTO. You can try turning the switch to Bump off too.

Details of checking the thermostat's FAN-Motorcar-OFF OR FAN-ON switch put away when the furnace (operating theatre air conditioning) fan won't stoppage running are

Those problems are explained

at THERMOSTAT WON'T TURN OFF.

2. CHECK for a MANUAL - ON Switch - At the furnace or air conditioning vent handler or blower unit of measurement: the fan limit switch may include a switch that manually keeps the fan running.

We discuss this switch right here. If you don't know where to ascertain the bound control turn on your furnace or air handler,

see FAN LIMIT SWITCH.

Some models of Devotee Limit Controls so much as the Honeywell L4046B229& Universal Lover and Limit Controler, particularly the Honeywell L4064B,W, and R models possess a hand-operated devotee switch that overrides the fan control to keep the fan working continuously. The white knob and white arrow in our photo point to this manual fan switch.

Exact a take the lover fix control switch. Before pulling the cover off of the switch, just run into if the alternate includes a control such as the white push-pull substitution like the white device shown at the lower left in our photo.

Depending on the position of this switch (pushed-in Beaver State pulled verboten) the fan Crataegus oxycantha be on extremity overthrow - causing the rooter motor to run unceasingly.

Bridle the printing connected the switch face to see if you should push the switch in or pull IT bent leave the cetacean on "Automobile". ("Military personnel" operating theatre "Manual" would make up forcing the fan to draw.)

Which agency to set apart the manual furnace or air conditioning electric fan fan switch:

Usually: "Labor-in" position on this (Honeywell) fan limit change over is for continuous sports fan cognitive operation and "Pull out" lieu is for automatic fan operation.

In that location are whatever reasons (explained

at Electric fan FAN CONTINUOUS OPERATION)

to leave the blower fan connected continuously for long periods, such as to use an air filtering system to meliorate indoor air tone.

And in some buildings we may run the blower continuously for to a greater extent even or healthier conditioned (heated or cooled) broadcast distribution.

What Else to Check if the Cetacean mammal or Furnace Fan Won't Stop

On the off happen that someone has unknowingly mis-siamese or shorted fan control wires at the fan limit switch, also check

out Devotee Demarcation SWITCH INSTALLATION &adenylic acid; WIRING.

On the chance that there is a shorted thermostat wire, a trouble that can also cause the A/C or affectionate air furnace fan to run ceaselessly

see Thermoregulator WON'T Wrench Murder.

Details about the manual FAN Along or Winnow AUTO ON switch perpendicular at the furnace or gentle wind manager at the manual of arms

at BLOWER FAN Around-the-clock OPERATION.

This article series answers most questions about central heating organization troubleshooting, inspection, diagnosis, and repairs.

We describe how to scrutinize, troubleshoot and mending heating and atmosphere conditioning systems to inform interior owners, buyers, and home inspectors of common heating plant defects.

Contact lens the States to suggest text edition changes and additions and, if you wish, to meet online listing and citation for that share.

Lecturer Question: Furnace fan keeps running with no heat coming from the furnace

2015/10/22 Anonymous said:

My rooter keeps running play with no heating system on furnace. What can I do?

Reply: 6 steps to getting heat connected when the sports fan runs simply the furnace does not

If the furnace does not even try to run, that is if it never even starts, so follow these steps:

1. Check the thermostat settings to be sure that you are calling for heat (set-temperature is above room temperature).

   See THERMOSTATS, HEATING / COOLING - household

2. Check that the thermostat FAN switch is plant to AUTO not to ON.

   Figure THERMOSTAT SWITCHES, Outside

3. Check that the manual FAN Happening switch at the buff limit switch in the furnace operating theater line handler is non in manual ON position.

   Run into FAN LIMIT SWITCH for details.

4. Check the furnace primary controller to see if the "reset" button on the control (or happening the burner causative) has popped out - you can try pressing the switch in One time but don't keep pressing it as doing so is unreliable.

   For inunct fired furnaces see Readjust Flip - Heating system CONTROL

   or see RESET SWITCH, Bounder CELL Electrical relay

   surgery on older furnaces consider STACK Electrical relay Swop

   For tense motor reset switches that are present connected some (not all) oil burners

   see ELECTRIC MOTOR OVERLOAD RESET Transposition

   For gas pink-slipped furnaces

   see FLUE Shoot a line SPILL Replacement Light & RESET; other defects such as a bad thermocouple junction can keep the bluster burner from igniting or burning.
   
   For gas jet thermocouple problems

   interpret THERMOCOUPLE REPAIR / Alternate

5. Check for voltage at the oil furnace primary control. This is a spatula-shaped test to see that power is actually being delivered to the oil furnace control. You buns use a neon tester, a VOM, DMM, or a voltage sensor stick.

   Watch outgoing: if you are not expert in safe use of electrical test tools you could be electrocuted - killed. Call an expert.

   See VOLTS Measuring METHODS

6. See to it for a terrible capital control: If there is potential dro to the elemental control, no reset buttons are popped, and the thermostat is calling for fire u (check that right at the primary control thermostat wires) and then I shady a nonfunctional primary control social unit itself.

   At that point your heating plant service tech will perform her have tests and then if needed doctor wiring OR replace the furnace control.

   Oil colour heating system: see CAD Prison cell RELAY SWITCH
   or
   Gas hotness: see the gas furnace controls cited above at stair 4.

If the furnace tries to start but cannot keep running game then there is a different problem such American Samoa zero fuel operating theater an unsafe condition.

See Name & FIX HEATING PROBLEMS-FURNACE - home

A full-scale list of oil colour and gas laid-off furnace controls is

Reader Q&A - also see the FAQs series linked-to below

Nathan

Good going on those diagnostic stairs.

You're rightfield that a furnace that uses "centering disc" controllers to manage the fan won't feature a Honewyell dial-eccentric fan limit control; but it's of course lul performing those functions: fan Along OFF and Commanding limit settings are controlled by those snap-disc controls (whose wiring you may deprivation to follow & check out)

With the thermostat wires completely disunited at the air coach end, and when the rooter won't stop, we close out an issue with shorted TT wires also as a bad thermoregulator or thermostat setting.

Course "South Korean won't break off" bears approximately clarification: IT is correct for the sports fan to continue running for a minute or so after a call for heat, to extract the unexhausted heat from the heat money changer and frankincense avoid damaging it.

If you are dead certain that thither is no Buff Connected control anyplace happening the furnace, and it's disconnected from the thermostat wires at the furnace end then thither's not more than left-handed: I'd suspect a unfavorable cinch saucer, (I hear that you time-tested it), a shorted telegraph in the air handler, or a bad electrical relay in the vent coach.

Give thanks you. I have looked direct your article extensively and tested at all grade that is applicable to my organisation. Though I identical well could rich person missed things as I get lost in the unusual types of systems.
It is an galvanizing heating system with a heat up pump and furnace.

1. Thermostat fan set to auto. Unmoving runs all the time. Smart thermostat indicates that fan is off. Thermoregulator still calls for the sports fan when the furnace kicks on but when the furnace turns off and the fan is no more called for at the thermostat information technology noneffervescent runs.

2. It doesn't seem atomic number 3 though there is a shorted wire arsenic when I disconnect the thermostat from the furnace by disconnecting it's wires at the Bare Handler, the fan still runs.

3. There is no fan limit switch that I am reminiscent of. It is a Trane and the furnace is BAY96X141502.

4. This scheme has a snap magnetic disk type limit flip. Just I have checked it with a multimeter and it appears to be operative correctly. Likewise the furnace is continual as it should, just with unchangeable blowing so if i understand right the fix swop would also cost keeping the furnace from running normally.

Let me lie with if i'm wanting checking something and I'll check it out.

Nathan

Let's start I asking you to recap the causes of blower fan not fillet that are relinquished in the article above along this page because that's many complete than if I assay to make that astir again in an off-the-cuff reply.

Please take a look and let me live what you think and let me know what questions remain.

Hullo looking some technical help with our HVAC system. I just replaced the blower motor in our furnace and it is flying constantly since the change. I've disconnected IT from the thermostat to sequester the job and it still fires up as soon as the power comes on and stays that way with or without the furnace engaged.

The furnace itself still turns off and on as normal so I Don River't think it's the furnace limit controller reading overheat or going bad. I suspect it could be a badly electrical relay.

The thing that really confuses me is that all morning when I wake raised it tends to be off and stays that agency until triggered either past the thermostat, the fresh flying exchange or equal me cutting the mightiness and turn it back on gets information technology going again. Then it stays running until the next morning again.

Keith

let's bulge out by stepping through the Diagnostics given happening the Page above. Let me know what find or what questions persist.

my furnace will not shut in murder i have to use the breaker to shut it polish off

i give birth a colman electric furnace that wont exclude off

thank you for that it, too. Your paragraph yes I agree and we discussed in this article serial publication The observation that it's absolutely world-shattering for the blower fan to continue running game for at any rate a abbreviated time subsequently the thermoregulator stops calling for heat. That's to express the remaining heat out of a heat money changer and thereby to avoid cracking the heat exchanger from high temperatures which successively could fix the furnace Unsafe and risk carbon copy monoxide poisoning.

So to be clear we should make out between the fan continuing to run for a little separation typically 30 seconds or a minute later on the postulate heat of content as distinct from the fan that just runs continuously.

If the fan runs continuously with never shutting off that's the spot discussed on this page and is not that he's clearing cycle that you found in the instructions and that we also discussed in this article serial publication

Thanks.
I looked all through the duct work and there is defintely no accountant in there. The stat is set at auto and it is a fairly new stat.
The manufactures data says,

"Time delay for blower activation: 60 seconds (std.)

130 deg. F Aquastat (w/optional aquastat).

Thusly i think that 60 sec delay is just built into the board

I don't see any options or markings for time delay nor any DIP switches.
In any event I can test IT?

thanks for your help

Found a little more info looking direct the data sheets,

Units without Factory Installed Aquastats or Deactivated Aquastats- A time detain of 60 seconds follows in front the circuit between R and G are complete activating the indoor blower motor. The Air Handler fan will turn off 30 seconds after the Thermostat stops career for heating.

Ovsa

On that point is usually a fan limit control in the air handler that turns the fan on or polish off dependant on broadcast temperature sensed in the plenum just above the heater's wake exchanger.

If the fan won't stop on your unit count for one and only of the controls described above on this page and that can be secondhand to manually turn the fan connected for continuous operation. One of those is on the fan limit see to it, another is often on your way thermostat, and connected occasion in that respect Crataegus oxycantha personify a fan master the right way on the written racing circuit board in the aerial manager.

Look furhter for a insure board nonstarter: if your air handler does not use a separate timer-containing sports fan limit control the time delay in rooter shut-off may atomic number 4 controlled past dip switches happening a control board or aside a hard-wired timer.

If you wear't hold the manual for your social unit see

ADP Sophisticated DISTRIBUTOR PROUCTS heating & cooling systems

Or this may Be the IO Extremity for your unit:

ADP B-Series Multi-Position & Hydronic Send Handlers Io Manual [PDF] (2017) Electric or Hot Water Heat, with available Variable-Fastness High Efficiency ECM Motor

I have a ADP aerate handler with a hot water heating coil and a refrigerant curlicue. My thermostat controls the HW recirc pump.
in heating plant mode after the recirc pump shuts disconnected the fan keeps track, forever.

I do not see an aquastat or fan limit point switching in the housing anywhere.
my question is what controls the fan connected/off? Is it programmed right into the add-in or am i missing something?
thanks

ED

In essence, yes. IF your limit flip has no MAN-ON switch (found as a white campaign-pull knob or equally a lesser metal slide left-right lever) then yeah that control is in self-winding mode.

However some thermostats too let in a FAN Happening / AUTO / switch that can as wel control the fan.

If your fan NEVER turns off regardless of the thermoregulator setting then I suspect either one of the problems listed to a higher place on this page

OR

unrivaled of the situations described at FAN WONT STOP - Thermoregulator SWITCH

If our honeywell rooter limit flip does non have the auto/manual of arms push/pull button for the fan, past is it safe to assume that it is always located for car? Our limit change does not have the jam for the button in the cover, but when opened, it looks like the image above except in that respect is no white button.

Maybe it broke off? (we retributive bought the house and moved in soh don't know).

I read another gloss from someone who said that not all models have the button, but our's keeps spouting well after the temperature is reached. Any ideas on how to make a point the sports fan limit switch is set to auto?

Howdy! My Honeywell digital thermostat is set on cooling presently and the fan is assail auto. Everything seems to be working fine, leave out every morning the blower fan comes on for a years (an hour surgery more) even though the thermostat shows no bodily function (temperature reduction ihas non advance)

The inside temp is already at set point and drops to a couple degrees downstairs the set point within few minutes of the fan coming on and stays thither the whole time the fan is running. This does not appear to happen at other multiplication of day. The thermostat seems to be working the style it should.

Well, information technology turned out to represent something verrrrrrrrry simple, simply within reason artful!

I checked all wiring from tstat to airhandler, and from airhandler to compressor. All lines were unceasing, with no boxershorts to any other lines.

The compressor continued to outpouring intermittently, with no icing seen on coils. The vent temps were65-66 degrees. After everything I tried (new airhandler devotee delay/electrical relay board, NOS tstat) got same intermittent results, I patterned the compressor was shutting down for some typewrite of overheat situation.

The reality...was different....*facepalm*

Contractor came out, gauged compressor and looked at boards on compressor. He then checked the airhandler, and the condensation float permutation (Here IT comes!).

He saw just about weewe in the switch cup, and said "you've got a clogged drainline. That's what's shutting down the compressor." He blew taboo the line, and systems been flying like a upper side since then.

The clog mustiness have been *biased*, with slow drainage. Between cycles, the telephone circuit would drain enough to let float substitution drop, and enable the compressor to discharge.

The compressor would guide, cool the coils, and condensation would begin accumulating-- until IT began to back in the slow waste pipe, and lift the float switch--and shut down the compressor. I did actually peek in the float switch cup some times, and never saw anything. I must have been look after it had drained down.

Spiro

Lashkar-e-Toiba's start with the Diagnostics above on this page as that testament be a more complete procedure than if I try to make it up once more typing in an off-the-cuff reply here. Please look through those steps and let Pine Tree State know what you find.

I have a Payne tired 1 cetacean condenser unit. My blower is staying on day in and day out.

Mighty.

The simplest and most straightforward test is to disconnect a thermostat wires at both ends and then working from for each one end test for any continuity between whatsoever pair of them.

Rent out me have it away what you find

give thanks you, I shall ohm tabu the control wires from thermostate mount plate, and check for shorts. Assumption: the W, Y and G should have no more continuity
to C (base), or to from each one other--decline?

I found a discussion in another forum with unchanged symptoms (periodical failure of airhandler to stop blowing after reaching setpoint temp), where poster saved the G communication channel was leftfield 'unsettled' (as opposed to being grounded) at setpoint shutdown. Atomic number 2 conjectured about putting a pull in-down resistor across G and C, to bleed any stray/leftover voltage at setpoint shutdown. He mentioned a 5K.

I just installed a 100K across G and C. Should only loading 24VAC transformer with an additive 24mA.

A cooling pedal just completed--system cooled to setpoint, thermostat clicked, and about a moment later, airhandler stopped up blowing---good! Fingers hybrid that this solved it!

I got that, Steve, but I'm not clear on whether or non you saved that by disconnecting the TDT right at the air handler was done at a sentence when the AHU was running when you think information technology should not.

Taking that step not only if rules out a bad thermostat but also mistakes in thermostat wiring and also the more-subtle problem of thermoregulator wires that are shorted together somewhere enroute.

I've already disjointed the thermostat, and replaced information technology with a brand new one...along with replacing the cetacean time delay electrical relay board.

Have you tried disconnecting the thermostat rightish at the air handler? That privy rule the thermoregulator extinct.

I've got the said problem, as posted On 2022-03-04 by Forrest.

My Amana/Goodman ARUF3714C airhandler keeps blowing, even after thermostat reaches coif-point; compressor shuts down, simply airhandler keeps blowing. The job is *intermittent*--sometimes airhandler shuts off, sometimes it just runs and runs (not the 65-ordinal efficiency delay).

Figured it was the blower delay relay board; replaced it and all seemed ok for a couple of days. It started up again nowadays. I titled Goodman and a technical school recommended the thermoregulator might be imperfect. I had a new-in-box thermostat on mitt, and wired information technology in.

It's doing same thing--seemingly ergodic failure of airhandler to shut down, later reach set-point temp.

I'm wondering about either the control wiring, or the 24 V transformer. We had a power outage a a couple of days ahead this trouble started, and wonder if the transformer power have been zapped, and isn't putting out 24 VDC.

The other possibility is wiring--if in that respect's or s random shortly or clear, responding to equipment shaking or...?

How to chip the hold in wiring? Is "C"/blue the common ground? What wires should be 'shorted' to apiece other, OR to ground, during diverse operating states?

Federal Reserve note

Your service technical school might confirmation for a bad instrument panel surgery ice block on the cooling whorl

I have a 15 sheer unit that blows strong and then weak, but continues to go up and down when active at Temp setting. I mean IT blows loud then cushioned then loud but maintains temp.
Whats happening can someone tell me what can I do ?

If the cetacean previously would run in high bucket along then I suspicious a failed relay or board.

Why South Korean won't the blower trip out high on my Benny Goodman heat ticker and Goodman furnace while in the cooling mode

Have you checked for shorted wires anywhere in the control circuit?

blower motor happening air conditioning will not shut down. I put in a new control control board,that didn't figure out.put in a red-hot contactor switch.that worked for 8 day's so stopped working.put in some other contactor switch .the same. fan motor still runs perpetually.

Tab

Your heating divine service tech may find a bad switch or control OR even a thermostat set wrong OR shorted thermostat wires.
She mightiness check the diagnostics above on this page first.

My furnace rooter in my house won't turn out when my unit is off

Jamie

Perhaps there is a defective fan fix control or fan electrical relay control flip.

Sometimes my blower fan won't shut slay for a piece. IT will work for half the day then the strange half of the day it will non close off.If I flip the breakers off and honorable back on the fans girdle off until the next cps.

Starting time let's identify the exact brand and model of heater and then look at the manual to see what settings are available.

On almost equipment there's actually a user operable exchange that testament turn the fan to run continuously. But on some it might exist a pickpocket switch or jumper.

The other place to look course is at the thermostat. You can find tabu the thermostat by disconnecting the thermostat wires alone at the heater. If the fan keeps running then IT's not a thermostat setting.

Thank you for getting back to me. You stand for you think IT's the ECM problem (bad or jell that way) Eastern Samoa well?

What do I need to ut, if I get into't want the fan constant blowing?

I agree with you that typically there's either a flip position someplace Oregon a shorted wire surgery hard control

Thank you for all the very very accommodative information found on this website! I am a new homeowner and I found the blower fan (Genteq Endura ECM FM19, 1/2 hp, 230VAC) installed has been running constantly. This is what I have gathered insofar:

1. if I disconnect 5-pin low voltage signaling on the ECM, the fan still runs.

2. I checked voltage on the 4-pin power supply to the ECM, they are all correct (C-0V, L-115V, G-0V, N-115V).

3. snap-disc thermo switch checked.

4. heat sequencer curbed (I have a heat heart and electric heat).

5. fan relay is quite hard to reach, but when I telephone fan-on, the relay clicks and the fan blows a fiddling bite stronger.

6. midland of ECM looks great, no dust, no rust, no ruptured capacitor, perfect rubbery varnish.

I suspect the ECM module is programed to run the motor non-stay, by the builder or previous owner? Political program # 604253-05. Or what else could be the problem Hera? Thank you over again!

Regards,
Nemo

This sounds as if the FAN ON switch is set to ON at the thermoregulator Oregon on the fan limit controller inside the furnace aura coach

AND

that your furnace is non working - that is the burner won't play. Depending on the fuel (oil, vaunt, electric) you'll find different diagnostic routines in the Clause INDEX conferred in the Carry on Reading part of this varlet

Blower fan continuously running patc heat off switches on heat and on auto no give notice in the box lover still runs

Question:

2019/11/04 Misty Lawhon

I think my line off and the fan off but my furnace keeps lighting up. I'm worried it with take fire.

Reply:

Misty

I fundament't state what's happening with your furnace from your little school tex: is the thermostat calling for heat?

Watch out: In any outcome if you have the slightest worry that the warmer is unsafe then

I hope you simply shut down the system and then called for resort;

Question:

2019/10/18 Henri Nseke

Fundament blower running game constantly

Doubtfulness:

2019/08/15 Rick asked

Why does the ac fellate thru furnace

Response:

It's using the indoor furnace fan to blow cold beam through the same duct system used for warm strain heating.

...

Continue reading at Winnow WONT STOP - Thermoregulator SWITCH, or select a subject from the closely-germane articles downstairs, Beaver State learn the complete Clause INDEX.

Oregon see FURNACE FAN WONT Give up FAQs - questions & answers about why the furnace blower fan won't stop running

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What Causes a Furnace Fan to Keep Running

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