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Honeywell Thermostat Not Heating Up, How to Fix

Picture of the Honeywell RTH9580WF Internet Thermostat, mounted but powered down, snapped onto wall plate.

A Honeywell thermostat not heating up your property can occur for a lot of causes. Poor thermostat placement, to a damaged heating system. Right here, we record a few of these causes. We then supply troubleshooting methods and restore hints to unravel these heating points. First, we take a look at what may go flawed within the Honeywell thermostat itself. Then we speak concerning the furnace points that may additionally trigger too-low heating ranges.

Potential Causes for the Honeywell Thermostat Not Heating Up the Home

Thermostat Not Degree Might Trigger Honeywell Thermostat Not Heating Up your Home


Poor leveling on older thermostats can have an effect on how properly they reply to room temperature modifications. These fashions relied on a bimetal spring to sense temperature. They hooked up a mercury change to the top of that spring. Then, as room temperature rose and fell, the spring modified measurement. This tipped the mercury change on or off to deliver room temperature close to the thermostat set temperature.

You wanted correct leveling for this tipping to happen as designed. Certainly, if tilted too far off of degree, the heating system may by no means warmth up in any respect. On this state of affairs, the mercury inside doesn’t make or break the contacts because it ought to.


Degree your Honeywell thermostat if it isn’t already degree. If it’s not too far out of degree, attempt loosening the screws that maintain it to the wall. Then, tilt it towards degree. Lastly, whereas holding the thermostat in that place, tighten the screws once more.

But when the thermostat is just too removed from degree, drill new mounting holes. To try this, take away the screws and wires in the event that they get in the best way. Then reposition the thermostat over the brand new holes. Lastly, drive the screws into these new holes. We advise placing wall anchors into these holes for a stronger maintain.

For those who nonetheless have a mercury thermostat, it might be time to switch it with a present mannequin. At this time’s thermostats have extra correct sensors and extra options. Plus, these newer ones work properly, regardless of how far off of degree you put in them. They’ll heat the home appropriately in any place.

Honeywell Thermostat Misplaced Energy

Picture of the Honeywell RTH9580WF Internet Thermostat, mounted but powered down, snapped onto wall plate.Honeywell RTH9580WF Web Thermostat, mounted however powered down, snapped onto wall plate.


The display on Honeywell sensible thermostats seems clean or darkish. No readings or standing messages seem. Additional, the furnace heater doesn’t run. Plus, you hear no buzzing on the furnace. There could also be no signal of energy loss on at the moment’s non programmable thermostats. That’s, besides that their again lights don’t mild up. However the impact continues to be the identical. The furnace warms your property by no means, regardless of the thermostat setting.


Honeywell thermostats get energy from the furnace system often. So, verify that each one elements of that furnace have energy. Typically there’s one circuit breaker that feeds the furnace itself, and one other that delivers energy to the surface unit in warmth pump setups. So verify that none of those has tripped out.

Verify that the warmth works. The heating and cooling subsystems typically get energy from separate circuit breakers. So, the thermostat might get its energy from both one, though often not each. An influence loss in both system might trigger Honeywell thermostat not heating up the house. By checking that the warmth works, you’ve dominated out this reason for thermostat energy loss. On this method, a defective cooling system could make the heating system fail too.

Thermostat Not Calibrated Appropriately May Trigger Honeywell Thermostat Not Heating Up the Home

Picture of the Honeywell RTH9580WF thermostat on same wall as a typical fridge freezer thermometer, used for thermostat temperature calibration.Picture of the Honeywell RTH9580WF thermostat on same wall as a typical fridge freezer thermometer, used for thermostat temperature calibration.Calibrating Honeywell RTH9580WF thermostat temperature, utilizing a fridge freezer thermometer, with Each on similar wall.


The present temperature studying on the thermostat might not present precise room temperature. Take into consideration your heating system. The thermostat reads excessive. That’s, it reads 76 levels when the precise room temperature is 72 levels. Right here once more, the furnace could also be not run in any respect as a result of the thermostat thinks that the house is hotter than it truly is.  So, the furnace won’t increase room temperature additional. Thus, the thermostat by no means heats up your property to snug ranges for you.


Calibrate your Honeywell thermostat on these fashions that help this. To calibrate the thermostat, purchase an correct thermometer. Then, place it close to the thermostat. Subsequent, anticipate a half hour for the readings to stabilize. Then, notice the distinction in studying between the thermometer and the thermostat studying. Within the 72 levels Vs. 76 levels instance above, the distinction is 4 levels. If the thermostat reads 4 levels hotter than the thermometer, then regulate thermostat calibration 4 levels within the adverse. If the thermostat reads 4 levels cooler, then modify the studying 4 levels within the constructive.

Thermostat Badly Wired

Picture of needle nose pliers being used to straighten the ends of thermostat wires before connecting them to the new wall plate terminals.Picture of needle nose pliers being used to straighten the ends of thermostat wires before connecting them to the new wall plate terminals.Use needle nostril pliers to straighten thermostat wires earlier than connecting to new wall plate terminals.


If the heating drawback occurred once you put in a brand new thermostat, you’ll have erred in the way you wired it. Maybe you’ve reversed the W and Y wires. This may run the cooling stage although the thermostat is definitely calling for heating. Different signs might come up too. These depend upon which wires and what number of of them you could have related to the fallacious thermostat terminals.


Verify for proper wiring at each ends of the thermostat cable. On the thermostat, connect all wires to the appropriate terminals within the wall plate. Then, do the identical on the furnace finish. Get assist from knowledgeable heating system repairman when you really feel insecure matching these wires up with the best terminals.

Damaged Thermostat Wiring can Trigger Honeywell Thermostat Not Heating Up Your Residence

Picture of the Honeywell Smart Thermostat RTH9580WF wall plate, mounted, with wires connected.Picture of the Honeywell Smart Thermostat RTH9580WF wall plate, mounted, with wires connected.Honeywell Sensible Thermostat RTH9580WF wall plate, mounted, with wires related.


The strong copper wires within the thermostat cable can break if flexed too typically. Or, maybe the installer stapled the cable with an excessive amount of strain or stapler misalignment, and nicked the cable.

This situation usually exhibits up throughout new thermostat testing. However typically, it won’t floor for years. Plus, settling of wall studs can flex these wires that installers typically fasten to them. So, after many years, this flexing can put on wire coverings, inflicting defective furnace heating operation.


Exchange the cable between the thermostat and furnace. Keep away from tightly stapling the wire, and don’t fasten it greater than you have to for a safe set up. Lay it loosely.

Honeywell Thermostat Temperature Offset Set Too Giant

Picture of the Honeywell RTH9580WF thermostat, displaying its -Indoor Display Offsets- screen with a minus 1 degree temperature offset highlighted.Picture of the Honeywell RTH9580WF thermostat, displaying its -Indoor Display Offsets- screen with a minus 1 degree temperature offset highlighted.Honeywell RTH9580WF thermostat, displaying its -Indoor Show Offsets- display with a minus 1 diploma temperature offset highlighted.


The thermostat temperature show appears to point out that the present room temperature by no means reaches the set heating temperature. On this case, your heating system might certainly be heating to your required temperature, because it ought to.  However in case you go by the thermostat’s present temp readout, your house seems to by no means heat to that set temperature.

Now, think about the next.

  • Let’s say that you simply set the thermostat to warmth to 75 levels.
  • Additional, you might have set your show temperature offset to -Three levels. This makes your thermostat show a present temperature that’s three levels cooler than it truly is. On this case, when the present home temperature is 75 levels, the thermostat would present 72 levels.

Now no matter your temperature show offset setting, the thermostat nonetheless calls for warmth from the furnace till the precise room temperature reaches 75 levels.  Then, it will cease heating additional when the thermostat temperature readout reaches 72 levels, not 75 levels. Thus, the reported room temperature on the thermostat show, would by no means attain the set temperature (75) as a result of the thermostat shuts off the warmth when the precise temperature hits 75 levels. So, a big temperature offset can appear to be a Honeywell thermostat not heating up difficulty. Nevertheless it isn’t right here. The thermostat is definitely heating appropriately.  It’s simply that the decrease show studying makes it seem that it’s not.


Lower the show offset temperature. This helps guarantee that the temp studying on the thermostat reads near precise room temperature.  Plus, an correct show studying helps forestall exceed your furnace’s heating capability. Keep away from setting the temperature offset to multiple diploma both method (+ or – offset).

Mechanical Thermostats can Seize Up


From time to time with sensible thermostats, a snap of static electrical energy close to the thermostat, can freeze the contact display. Additionally, an influence surge within the residence’s electrical system can do the identical. Then too, the info proven onscreen not updates. Additional, the heating system might not come on. Regardless of how removed from set temperature the room temperature is, the heating system might not run in any respect.


When Honeywell thermostat not heating up the home occurs, attempt rebooting the thermostat. Flip off energy to it for ten to twenty seconds. Then change it again on. This energy biking is straightforward with many sensible thermostat fashions as a result of they will detach from furnace energy. Simply unsnap them from their wall plates. Then, wait a couple of seconds, and eventually re-attach them to reboot. Or, in case your Honeywell thermostat doesn’t come off of the wall simply, cycle on and off it on the breaker field. You’ll be able to cycle important energy to the entire furnace system by switching on and off the breakers that feed it. Doing this reboots the thermostat.

Thermostat Temperature Set Too Excessive or Too Low

Picture of an installed and operating RTH7600D Programmable Thermostat by Honeywell.Picture of an installed and operating RTH7600D Programmable Thermostat by Honeywell.Honeywell Programmable Thermostat RTH7600D


You’ll be able to set thermostats method decrease than the heating system can ship. Throughout a chilly time outdoors for instance, you may set the warmth temperature to 74 levels. However your furnace strikes solely sufficient BTUs to warmth to 72 levels.


  • Attempt setting the thermostat to a sensible temperature on your furnace. A sensible temp is one which your own home heaters can attain based mostly on present climate circumstances. If that setting doesn’t really feel snug, then your furnace could also be at fault.
  • So, verify your furnace for correct working as mentioned elsewhere on this piece, and repair as wanted.

In the event you do this stuff however nonetheless need greater temps within the house, then attempt the next.

  • Add extra heaters round the home, corresponding to electrical baseboard heaters or moveable area heaters.
  • Or, improve the central heating unit to a bigger measurement.  Mentioned extra within the subsequent part.
  • Add extra insulation round your own home.
  • Set up higher sealing home windows and doorways can even increase the excessive temperature in your house that your furnace can attain.

Furnace Points can Trigger Honeywell Thermostat Not Heating Up your Home

Clogged Furnace Filters and Fan Blades


Soiled air filters can constrict airflow although the furnace’s warmth exchanger. Clogged filters scale back how a lot the furnace heats. How so?  Soiled filters and fan blades transfer air much less nicely. Plus, they make extra noise apart from.


  • Exchange furnace filters month-to-month.
  • Plus, rent a professional residence heating technician yearly, to verify your furnace. He ought to clear out mud buildup inside.
  • Additionally, have him take away blockages within the air hander, examine the management models for injury, clear out air ducts, verify warmth registers round your own home for clogs, and so forth.

Wrongly Sized or Worn Furnace System can Trigger Honeywell Thermostat Not Heating Up your House


Typically, house builders minimize corners to chop prices when figuring furnace measurement. They need the most cost effective furnace they will get by with.  Sadly, these cheapo fashions are sometimes too small thus, to regulate the heating temperature properly. So, on very frosty days, you may see the Honeywell thermostat not heating up drawback present up.

Additionally, over time with warmth pumps particularly, their compressors lose effectivity. Why? As a result of both their valves begin leaking. Or the refrigerant leaks out via small holes within the piping.  As extra refrigerant leaks away, the much less environment friendly the heating system turns into.


  • Have an HVAC tech verify refrigerant strain and fill with sufficient refrigerant to convey this studying into line with what the HVAC system specs say it must be.   This worth differs relying on the mannequin of heating system you will have.
  • The tech also needs to learn the top and tail pressures whereas the compressor runs. Discover the fitting values for all of those on a sticker someplace contained in the HVAC unit.  If the ratio between head and tail strain is just too low, it might be time to exchange the compressor.
  • Additionally, the changeover valve is perhaps low cost sufficient to exchange. So too would the compressor. This restore could be the proper factor to do so long as the system is lower than fifteen to twenty years previous. However whether it is older, then exchange the entire system.

Soiled or Frosted Warmth Pump Coils can Set off Honeywell Thermostat Not Heating Up your Home


Soiled warmth pump coils, once more, sluggish airflow by means of the condenser outdoors, and the evaporator unit inside. Thus, dust can intrude with the heating system’s effectivity. Soiled coils lowers the BTUs per hour that a warmth pump can pump for instance. That would imply that the system can’t hold your quarters as heat as your thermostat setting requires.


  • These coils have intently spaced metallic fins that always turn into logged with dust. So have a professional clear these with pressured air or steam in excessive instances.
  • Or, attempt vacuuming the coils with a family hose and brush sweeper. Watch out to not bend the fins although, as they’re delicate. Bending them an excessive amount of can ceaselessly prohibit airflow and thus, scale back how properly your heating system (warmth pump) heats your home.

Extraordinarily Chilly Temps Outdoors Typically Trigger Honeywell Thermostat Not Heating Up your Home Inside


It’s widespread for furnaces to fail to maintain up when the climate outdoors could be very chilly.  They could run always but nonetheless fail to maintain up. Now there could also be nothing incorrect with the thermostat per se. And, there could be nothing the matter with the furnace both. The difficulty may be that your central heating system is just too small to beat the getting into chilly from outdoors.


  • Shut all home windows and drapes, particularly through the night time.
  • In case you have a multi stage heating system, examine that each one heating levels are working as they need to.
  • In case your home windows are previous or are single-pane, attempt upgrading to no less than double-pane. We like triple-pane.  Why?  As a result of these supply higher insulating. Thus, they hold the warmth inside higher.

One Stage Not Working in Multistage Techniques


You could be getting SOME heating, however not sufficient to carry room temperature on the desired worth.


When you see the Honeywell thermostat not heating up the house, verify that your compressors are working.

Verify all of the heating levels within the furnace (burners, parts), as some have multiple. For multi stage heating, stage one ought to come on first. As quickly as room temperature falls under the set level by half a level or so, you need to hear it begin up. If it doesn’t, discover out why. Then, the second stage ought to kick in if the room temp hits two or three levels lower than set temperature. Once more, if it doesn’t, this can be what’s inflicting your Honeywell thermostat not heating up your dwelling quarters.

For warmth pump methods, a defective or badly wired changeover valve can also trigger weak heating. On this case, your HVAC system might ship chilled air although the thermostat is absolutely calling for warmth.

Too Little Insulation or Too A lot Outdoors Air Getting In


If your home lacks sufficient insulation, this worsens the Honeywell thermostat not heating up concern. Certainly, a lot heat leaves by means of cracks round home windows, partitions, and doorways. Thus, the furnace works more durable to deliver the home as much as the set temperature. Certainly, there could also be many BTUs leaking in on this approach. So many BTUs, that the central heating system can’t backfill. The furnace can’t thus, keep the set temperature. So, your thermostat by no means reaches that set heating temperature.


Discover probably the most leaky areas of your property. Do this by strolling round inside the home, feeling for chilly spots. Search for locations the place chilly air leaks in. Then, seal these spots with the calking, hardening foams, and different supplies.

Make certain that the louvers on any exhaust followers to the surface that you’ve, shut utterly when the fan is off.  These embrace rest room or kitchen exhaust followers.

Substitute defective home windows and doorways. Once more, single pane home windows are large power hogs. We advise changing these with no less than double pane fashions.

Additionally, keep in mind the basement. We’ve discovered that changing our previous single pane basement home windows with glass block models helped so much. See our  The best way to Set up Glass Block Home windows publish for particulars on that undertaking.

These new home windows took an enormous load off of our HVAC unit. Certainly, the set temperature grew a lot simpler to take care of over a variety of heating values. Basement glass block home windows, in our case certainly lessened our Honeywell thermostat not heating up drawback.


As ought to be clear, the Honeywell thermostat not heating up drawback in houses has many causes. Plus, most of them lie past the thermostat. A poorly insulated residence, a furnace that’s too small, leaky home windows and doorways additionally contribute. All of those make the HVAC system work too exhausting to warmth your house. In lots of houses there’s little coolness to spare as a consequence of poor HVAC sizing. Sadly, the repair for this typically prices so much. Why? As a result of it means changing home windows and doorways, or including extra insulation. Or you might have to improve your furnace or add extra supplemental heaters to your property.

However we hope that now, you understand what may trigger the Honeywell thermostat not heating up your property situation. Figuring out the causes typically helps in selecting the best fixes. Despite the fact that one of the best repair might value probably the most, no less than now, you’ve the info in entrance of you. Good luck, and select the fixes correctly.

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Revision Historical past

  • 2019-04-15: Tweaked the concentrating on, eliminated advert code, and added tags and footage.
  • 2018-05-28: First revealed.

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