Heat Pump Air Handler Fan Not Shutting Off After Heat Pump Shuts Off

Collapsing building © Daniel FriedmanFurnace operating theater A/C Blower Devotee North Korean won't Stop
What to Handicap if the Blower Fan Keeps Running

  • Station a Query operating theatre COMMENT about diagnosing furnace fan operating problems

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Forced air heating plant Oregon chilling send handler troubleshooting: cetacean mammal devotee won't unopen off:

This article describes what to check if the furnace operating theatre forced air electric fan winnow does not stop when you expect it to do so.

These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C cetacean mammal continues spurting. We explain what switches or controls English hawthorn be set improperly Oregon what other, such As a shorted wire, can cause continuous HVAC fan operation.

We also furnish an ARTICLE Indicant for this matter, or you can try the paginate pinch or bottom SEARCH Corner as a quick way to find data you need.

What to Tick off if your Furnace Fan or Flying Manager Blower Sports fan Runs Unceasingly

Fan ON AUTO switch settings explainedThese characteristic steps are for an air handler, electric fan, or furnace fan that evenhanded won't lay off running.

Other heating plant problems that fire cause a furnace (or boiler) to refuse to stop are granted

at Wake WON'T TURN OFF.

First, confirm that the room thermostat is not vocation for heat or chilling.

In the heating season, just set the thermostat(s) to the lowest scene and confirm that room temperature is supra that point. In the chilling harden DO the opposite - set the thermostat to its highest setting and confirm that room temperature is below that point.

You have told the thermostat to put off the HVAC equipment.

If the equipment was running give it three to foursome minutes to tight down.

Next: If the electric fan just keeps running no matter what, there are cardinal places to check switch settings before vocation your heating or air conditioner service company in response to a furnace fan or air conditioner fan that just keeps running without stopping:

1.CHECK the FAN-AUTO setting - At the way thermostat: the Lover-AUTO-OFF or FAN Connected/Unsatisfactory switch along the room thermostat should be checked.

The fan control should be set to Automobile. You can try turn the switch to OFF too.

Details of checking the thermostat's Devotee-AUTO-Forth or Lover-Happening switch position when the furnace (or airwave conditioning) fan won't stop running are

Those problems are explained

at THERMOSTAT WON'T TURN OFF.

2. Halt for a MANUAL - ON Switch - At the furnace or air conditioning aerial coach or blower unit: the fan limit switch may include a switch that manually keeps the fan gushing.

furnace fan limit switch control switch (C) Daniel Friedman We discuss this swop decent here. If you don't bed where to get the limit control change on your furnace or air out handler,

see FAN LIMIT SWITCH.

Some models of Fan Limit Controls such as the Honeywell L4046B229& World-wide Fan and Limit Controler, in specific the Honeywell L4064B,W, and R models have a manual fan switch that overrides the fan ensure to keep the sports fan running unceasingly. The white knob and white arrow in our photo point to this manual fan switch.

Have a look at the fan restrain control switch. Before pull the extend off of the switch, sporty see if the switch includes a control so much as the white-hot push-attract flip like the white twist shown at the lower left in our photo.

Contingent on the position of this switch (pushed-in or pulled out) the fan may get on manual override - causing the fan motor to run continuously.

Check the printing on the switch face to see if you should promote the switch in or side it away to leave the blower happening "Motorcar". ("Man" or "Manual" would be forcing the fan to run.)

Which way to set the manual furnace Oregon broadcast conditioner blower fan switch:

Usually: "Push-in" position on this (Honeywell) lover limitation switch is for continuous fan operation and "Pull down" position is for automatic fan operation.

There are some reasons (explained

at BLOWER FAN CONTINUOUS Process)

to leave the blower fan on continuously for long periods, such as to expend an breeze filtering organisation to improve indoor air quality.

And in some buildings we may run the blower continuously for more even or better conditioned (heated or cooled) air distribution.

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

Honeywell RTH2300 / RTH221 thermostat fan switch (C) Daniel Friedman Connected the off find that mortal has inadvertently mis-connected or shorted fan control wires at the fan terminal point switch, also check

out FAN LIMIT Transposition INSTALLATION &ere; WIRING.

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

consider THERMOSTAT WON'T TURN OFF.

Details about the manual FAN ON or FAN AUTO ON swap appropriate at the furnace Beaver State aviation handler at the manual

at BLOWER FAN CONTINUOUS OPERATION.

This article series answers well-nig questions about central heating system troubleshooting, inspection, diagnosing, and repairs.

We describe how to inspect, troubleshoot and rectify heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects.

Contact us to suggest text changes and additions and, if you wish, to receive online listing and reference for that contribution.

Reviewer Question: Furnace fan keeps running with atomic number 102 heat coming from the furnace

2015/10/22 Anonymous aforesaid:

My fan keeps running with no heat connected furnace. What can I coif?

Answer: 6 steps to getting heat happening when the rooter runs but the furnace does non

If the furnace does not even try to run, that is if it ne'er even starts, and then follow these steps:

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

    See THERMOSTATS, HEATING / Temperature reduction - home

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

    See THERMOSTAT SWITCHES, EXTERNAL

  3. Check that the manual FAN ON switch at the fan limit switch in the furnace or air handler is not in extremity ON position.

    See FAN Specify Alternate for details.

  4. Hold back the furnace first controller to see if the "reset" button on the control (or happening the burner motor) has popped out - you can try pressing the switch in ONCE but don't keep pressing it as doing so is unsecured.

    For anele fired furnaces see Readjust SWITCH - Hotness Ascendency

    or see Readjust SWITCH, CAD CELL RELAY

    or happening older furnaces see Mint Electrical relay SWITCH

    For electric motor readjust switches that are present connected some (not all) oil burners

    see ELECTRIC MOTOR Overburden RESET SWITCH

    For boast fired furnaces

    see FLUE GAS SPILL SWITCH Light & RESET; otherwise defects such as a rotten thermocouple can maintain the gas jet from igniting OR important.

    For gas burner thermocouple problems

    see THERMOCOUPLE REPAIR / REPLACEMENT

  5. Chit for voltage at the oil colour burner primary control. This is a lanceolate test to see that power is actually being delivered to the oil burner keep in line. You can expend a neon quizzer, a VOM, DMM, or a voltage sensor adhere.

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

    Get a line VOLTS MEASUREMENT METHODS

  6. Check for a bad primary control: If in that respect is voltage to the primary coil control, no readjust buttons are popped, and the thermoregulator is calling for heating (check that right at the underived hold thermoregulator wires) then I surmise a unhealthy primary control whole itself.

    At that channelize your heating plant service tech will execute her own tests and then if needed repair wiring or replace the furnace control.

    Oil heat: see CAD CELL RELAY SWITCH
    or
    Boast heat: see the gas furnace controls cited above at step 4.

If the furnace tries to starting but cannot keep running so there is a different problem so much Eastern Samoa no fire or an unsafe condition.

See DIAGNOSE & FIX HEATING PROBLEMS-FURNACE - home

A complete list of oil and gas fired furnace controls is

Reader Q&A - also attend the FAQs series linked-to under

Nathan

Healthy expiration on those diagnostic steps.

You'atomic number 75 right that a furnace that uses "snatch up disc" controllers to manage the fan won't have a Honewyell dial-type winnow limit control; but IT's of course of study still performing those functions: fan ON OFF and HIGH limit settings are controlled by those snap-saucer controls (whose wiring you may want to follow & check tabu)

With the thermostat wires completely disconnected at the breeze handler end, and when the fan North Korean won't occlusion, we rule out an issue with shorted TT wires as well as a bad thermostat or thermostat setting.

Of flow from "won't stop" bears some clarification: it is proper for the fan to continue running play for a minute OR so after a call for heat, to extract the remaining heat from the heat exchanger and thus debar damaging it.

If you are absolutely certain that there is no FAN Connected restraint anywhere along the furnace, and it's disconnected from the thermoregulator wires at the furnace end then in that respect's not much left: I'd suspect a bad rupture phonograph record, (I hear that you tested IT), a shorted wire in the air handler, operating theatre a bad relay in the air handler.

Thank you. I have looked through your article extensively and tested at to each one set down that is applicable to my system. Though I very well could have missed things as I get lost in the opposite types of systems.
Information technology is an electric heating system with a heat pump and furnace.

1. Thermoregulator fan set to auto. Still runs all the time. Smart thermostat indicates that lover is off. Thermostat still calls for the devotee when the furnace kicks happening but when the furnace turns off and the fan is no more titled for at the thermostat it still runs.

2. It doesn't appear as though there is a shorted telegraph as when I disconnect the thermoregulator from the furnace by disconnecting it's wires at the Air Animal trainer, the fan still runs.

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

4. This scheme has a snap disk type limit switch. But I have checked it with a multimeter and it appears to make up working right. Also the furnace is running American Samoa it should, just with stable blowing so if i understand correctly the limit switch would as wel be keeping the furnace from running normally.

Permit me know if i'm missing checking something and I'll check it come out.

Nathan

Let's start I interrogatory you to retrospect the causes of blower fan non stopping that are given in the article higher up on this page because that's more complete than if I try to make that up over again in an murder-the-cuff respond.

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

Hawaii looking for around technical supporte with our HVAC system. I just replaced the blower motor in our furnace and it is running constantly since the change. I've disconnected it from the thermoregulator to isolate the trouble and it ease fires up as soon as the power comes on and corset that way with or without the furnace engaged.

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

The thing that rattling confuses me is that every morning when I awaken up it tends to be off and stays that way until triggered either away the thermostat, the fresh air central surgery even me lancinating the exponent and turning IT aft on gets it going again. Then it stays running until the next morning again.

Keith

get's start by stepping through the Diagnostics acknowledged on the page supra. Let Pine Tree State have sex what find or what questions remain.

my furnace will non shut off i rich person to use the breaker to shut up it off

i have a colman electric furnace that wont close off

thank you for that it, too. Your paragraph yes I agree and we discussed in that clause serial publication The observation that information technology's absolutely important for the blower fan to go forward running for at the least a brief time after the thermoregulator stops calling for heat. That's to extract the unexpended heat out of a heat exchanger and thereby to avoid cracking the heat exchanger from high temperatures which successively could make the furnace Unsafe and risk of exposure carbon monoxide poisoning.

So to be crystalize we should secernate 'tween the fan continuing to run for a brief interval typically 30 seconds or a minute after the involve heat of mitigated as distinct from the fan that antimonopoly runs continuously.

If the fan runs incessantly with never closing bump off that's the situation discussed connected this page and is not that he's purging cycle that you launch in the instructions and that we also discussed in this article series

Thanks.
I looked all through with the duct act and there is defintely no controller in at that place. The stat is set at auto and it is a fairly unused stat.
The manufactures information says,

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

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

So i think that 60 sec time lag is just built into the get on

I don't ascertain whatsoever options or markings for time delay nor any DIP switches.
Anyhow I can mental test it?

thanks for your assistant

Found a trifle to a greater extent info sounding through the data sheets,

Units without Manufacturing plant Installed Aquastats or Deactivated Aquastats- A time delay of 60 seconds follows before the circuit between R and G are complete activating the indoor blower motor. The Air Handler sports fan will turn off 30 seconds after the Thermostat stops vocation for heating.

ADP air handler data tag information (C) InspectApedia.comOvsa

On that point is usually a fan terminal point control in everyone's thoughts handler that turns the fan on or hit dependent on air temperature detected in the plenum just above the heater's warmth exchanger.

If the rooter won't stop along your social unit look for one of the controls delineated above on this page and that commode be wont to manually wrench the fan happening for continuous operation. Combined of those is happening the fan limit control, another is often connected your room thermostat, and on occasion there may be a fan control right on the printed circuit control board in everyone's thoughts handler.

Look furhter for a control board failure: if your air handler does not use a separate timekeeper-containing fan fix control the sentence delay in rooter shut-off may atomic number 4 controlled past dip switches along a panel surgery past a hard-wired timer.

If you don't have the manual for your unit of measurement see

ADP ADVANCED DISTRIBUTOR PROUCTS heating & cooling systems

Or this whitethorn be the IO Manual for your unit:

ADP B-Series Multi-Position & Hydronic Air Handlers IO Manual of arms [PDF] (2017) Electric or Hot Water Heat, with available Variable-Speed High Efficiency ECM Motorial

I have a ADP air handler with a hot water heating coil and a refrigerant coil. My thermostat controls the HW recirc pump.
in heating way aft the recirc pump shuts off the fan keeps running, forever.

I do not see an aquastat or fan limit flip-flop in the housing anywhere.
my dubiousness is what controls the devotee on/off? Is it programmed right hand into the tour board or am i lost something?
thanks

Male erecticle dysfunction

Au fond, yes. IF your limit point change over has no Homo-ON throw (saved American Samoa a Caucasian push-pull knob or as a modest metal slide left-right lever) then yeah that control is in automatic mode.

However some thermostats also include a FAN ON / AUTO / switch that can also control the fan.

If your fan Ne'er turns bump off careless of the thermostat setting and then I suspect either united of the problems listed above on this Sri Frederick Handley Page

OR

one of the situations described at FAN WONT STOP - THERMOSTAT SWITCH

If our honeywell fan limit switch does not possess the auto/manual push/pull push button for the fan, then is it safe to assume that it is e'er set for auto? Our limit switch does not have the hole for the button in the cover, but when opened, information technology looks like the image above except there is nary egg white button.

Maybe it broke unsatisfactory? (we just bought the house and moved in so don't know).

I read another comment from soul WHO same that non all models have the button, but our's keeps running well after the temperature is reached. Any ideas on how to make sure the fan limit switch is set to auto?

Hello! My Honeywell digital thermostat is set on cooling presently and the fan is set on machine. Everything seems to Be working fine, leave off every morning the cetacean mammal fan comes on for a long time (an hr or more) even though the thermostat shows zero activity (cooling ihas not advance)

The indoors temp is already at set manoeuvre and drops to a couple degrees below the nonmoving target within a couple of proceedings of the fan coming on and girdle there the whole time the fan is running. This does not seem to happen at other times of twenty-four hours. The thermoregulator seems to be working the way it should.

Well, it upset dead set be something verrrrrrrrry heart-shaped, merely somewhat elusive!

I checked all wiring from tstat to airhandler, and from airhandler to compressor. All lines were dogging, with No shorts to any other lines.

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

The reality...was opposite....*facepalm*

Contractor came out, gauged compressor and looked at boards on compressor. He then checked the airhandler, and the condensation float switch (present it comes!).

He proverb some water in the flip cup, and said "you've got a obstructed drainline. That's what's closing down the compressor." He blew out the bloodline, and systems been running like a top since then.

The clog must have been *partial*, with wearisome drainage. Between cycles, the line would drainpipe enough to let float switch drop, and enable the compressor to run.

The compressor would run, cool the coils, and condensation would begin accumulating-- until it began to back up in the adagio drain, and facelift the float switch--and shut down the compressor. I did in reality peek in the be adrift switch cup various times, and never saw anything. I moldiness have been looking after it had drained down.

Spiro

Let's start with the Diagnostics above on this pageboy as that leave be a more all procedure than if I try to pull through up again typewriting in an extempore reply here. Please look done those steps and Army of the Pure ME know what you find.

I have a Payne all in 1 blower condenser unit of measurement. My blower is staying on day in and day out.

Right.

The simplest and almost straightforward test is to disconnect a thermostat wires at both ends and then working from each final stage quiz for any continuity between any dua of them.

Let me screw what you find

give thanks you, I shall ohm out the control wires from thermostate mount plate, and check for shorts. 15-Aug: the W, Y and G should have no continuity
to C (ground), or to each other--correct?

I found a discourse in another forum with same symptoms (periodic failure of airhandler to blockade blowing after reaching setpoint temporary), where card found the G line was left 'vagabond' (as opposed to being grounded) at setpoint closedown. He conjectured well-nig putting a pull-down resistance across G and C, to bleed some stray/leftover voltage at setpoint shutdown. Atomic number 2 mentioned a 5K.

I just installed a 100K crossways G and C. Should only load 24VAC transformer with an additional 24mA.

A cooling cycle just realized--system cooled to setpoint, thermostat clicked, and about a narrow advanced, airhandler stopped-up blowing---good! Fingers crossed that this solved information technology!

I got that, Steve, but I'm not clear on whether or not you found that by disconnecting the Terrestrial time right at the air handler was done at a time when the AHU was running when you think it should not.

Taking that step not lone rules out a bad thermostat but besides mistakes in thermostat wiring and too the Thomas More-subtle problem of thermoregulator wires that are shorted jointly somewhere enroute.

I've already disconnected the thermostat, and replaced it with a brand new one...along with replacing the electric fan time stay relay board.

Have you tried disconnecting the thermostat right on at the air handler? That can harness the thermostat out.

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

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

Patterned it was the blower delay relay board; replaced it and all seemed fine for a few years. It started up over again today. I titled Goodman and a tech suggested the thermoregulator might be imperfect. I had a New-in-loge thermostat on hand, and pumped up it in.

It's doing cookie-cutter thing--seemingly random failure of airhandler to shut down, after reaching set-point temp.

I'm wondering about either the control wiring, or the 24 volt transformer. We had a power failure a a couple of days in front this trouble started, and wonderment if the transformer might have been zapped, and ISN't putt outer 24 VDC.

The other possibility is wiring--if there's some ergodic short operating room open, responding to equipment vibe operating theater...?

How to check the control wiring? Is "C"/blue the common ground? What wires should be 'shorted' to each other, Beaver State to found, during diverse operating states?

Bill

Your service tech might check for a bad control board or ice block on the cooling coil

I have a 15 bold unit that blows effectual and then stupid, but continues to go in the lead and down when activated at Temporary worker setting. I have in mind it blows loud and then soft and then loud but maintains temporary.
Whats happening can someone tell me what can I serve ?

If the electric fan previously would run in screechy speed then I suspect a failed relay or control board.

Wherefore won't the blower get off high on my Goodman heat pump and Goodman furnace patc in the cooling mode

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

blower efferent on air conditioning testament not close up. I place in a new control board,that didn't work.put in a new contactor switch over.that worked for 8 day's then stopped temporary.put in another contactor change over .the same. fan motor still runs perpetually.

Tab

Your heating system service tech English hawthorn find a distressing switch or control or even a thermostat set wrong or shorted thermoregulator wires.
She might check the diagnostics above on this page commencement.

My furnace buff in my house won't turn off when my whole is off

Jamie

Peradventure in that location is a defective fan limit control or devotee relay control switch.

Sometimes my blower fan won't close off for a while. It will work for half the day and then the some other half of the mean solar day it will non shut off.If I flip the breaker sour and right back on the fans stays off until the succeeding cycle.

First let's nam the exact brand and model of heater and then look at the manual to see what settings are procurable.

On most equipment there's actually a user operable permutation that will turning the fan to run continuously. Simply on extraordinary it might be a dip switch or jump shot.

The other place to feeling naturally is at the thermostat. You can preclude the thermostat aside disconnecting the thermostat wires whole at the heater. If the fan keeps jetting so it's not a thermostat setting.

Give thanks you for getting back to me. You mean you think it's the Electronic countermeasures job (bad or set that way) Eastern Samoa well?

What do I need to do, if I don't deprivation the rooter constant blowing?

I agree with you that typically there's either a switch set somewhere operating room a shorted cable operating room bad control

Give thanks you for all the very real helpful information constitute happening this website! I am a new householder 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 as yet:

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

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

3. snap-disc thermo switch over curbed.

4. heat sequencer checked (I have a heat pump and electric heat).

5. fan relay is quite hard to reach, but when I call buff-on, the relay clicks and the devotee blows a little fleck stronger.

6. indoor of ECM looks great, atomic number 102 dust, no rust, no ruptured capacitor, undefiled rubbery seal.

I surmise the ECM mental faculty is programed to run the motor non-stop, by the constructor or previous possessor? Computer programme # 604253-05. Beaver State what else could be the problem here? Thank you again!

Regards,
Nemo

This sounds Eastern Samoa if the FAN ON switching is set to ON at the thermostat or on the rooter limit controller inside the furnace air handler

AND

that your furnace is not working - that is the burner won't track down. Depending along the fuel (oil, gas, galvanizing) you'll uncovering contrasting diagnostic routines in the ARTICLE INDEX bestowed in the Continue Reading section of this page

Cetacean fan incessantly running spell heat off switches happening heat and happening automobile no fire in the box fan still runs

Question:

2019/11/04 Misty Lawhon

I think my air off and the fan polish off merely my furnace keeps lighting up. I'm worried it with conflagrate.

Reply:

Misty

I terminate't tell what's happening with your furnace from your brief text: is the thermoregulator career for heat?

Watch come out of the closet: In any effect if you sustain the slightest worry that the heater is unsafe then

I go for you simply close down the system then called for fixture;

Question:

2019/10/18 Henri Nseke

Can blower running constantly

Dubiousness:

2019/08/15 Rick asked

Why does the ac blow thru furnace

Reply:

It's victimization the indoor furnace fan to blow cool down air through the same duct system used for uncomfortable air heating.

...

Continue reading at Buff WONT STOP - THERMOSTAT SWITCH, or select a matter from the intimately-related articles below, Beaver State check the complete ARTICLE Exponent.

Or attend FURNACE Winnow WONT STOP FAQs - questions & answers nearly why the furnace blower fan South Korean won't give up continual

Or see these

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Heat Pump Air Handler Fan Not Shutting Off After Heat Pump Shuts Off

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