You might see your Honeywell thermostat that says that the heat is on, and yet you get no heat. This can happen for many reasons. A broken thermostat, incorrect wiring, tripped circuit breakers, blown fuses, or a broken HVAC system could cause this. Here, we describe some of these causes, and then offer troubleshooting techniques and repair hints to solve them. First, we look at what might go wrong in the thermostat itself. Then we talk about the power and appliance issues that can also cause this.
If the heating problem happened when you installed a new thermostat, you may have erred in how you wired it. Perhaps you’ve reversed the W and Y wires. This would run the cooling stage though the thermostat is actually calling for heat. Other symptoms may arise too. These depend on which wires and how many of them you have connected to the wrong thermostat terminals.
Check for correct wiring at both ends of the thermostat cable. At the thermostat, attach all wires to the right terminals in the wall plate. Then, do the same at the furnace end. Get help from a professional heating system repairman if you feel insecure matching these wires up with the right terminals.
The solid copper wires in the thermostat cable can break if flexed too often. Or, perhaps the installer stapled the cable with too much pressure or stapler misalignment, and nicked the cable.
This issue normally shows up during new thermostat testing. But sometimes, it might not surface for years. Plus, settling of wall studs can flex these wires that installers often fasten to them. So, after decades, this flexing can wear wire coverings, causing faulty heat operation.
Replace the cable between the thermostat and furnace. Avoid tightly stapling the wire, and don’t fasten it more than you must for a secure installation. Lay it loosely.
You can set thermostats way lower than the heating system can deliver. During a cold time outside for example, you might set the heat temperature to 74 degrees. But your furnace moves only enough BTUs to heat to 72 degrees. On particularly cold days, it may feel like there’s no heat output, even though the furnace is operating normally.
If you do these things but still want higher temps in the home, then try the following.
Dirty air filters can constrict airflow though the furnace’s heat exchanger, and cut the heat output to near zero. Clogged filters reduce how much the furnace heats. How so? Dirty filters and fan blades move air less well. Plus, they make more noise besides.
Sometimes, home builders cut corners to cut costs when figuring furnace size. They want the cheapest furnace they can get by with. Sadly, these cheapo models are often too small thus, to control the heating temperature well. So, on very frosty days, you might see the problem show up.
Also, over time with heat pumps especially, their compressors lose efficiency. Why? Because either their valves start leaking. Or the refrigerant leaks out through small holes in the piping. As more refrigerant leaks away, the less efficient the heating system becomes. In this case, the unit will produce little or no heat even though it’s running.
Dirty heat pump coils, again, slow airflow through the condenser outside, and the evaporator unit inside. Thus, dirt can interfere with the heating system’s efficiency. Dirty coils lowers the BTUs per hour that a heat pump can pump for example. That could mean that the system cannot keep your quarters as warm as your thermostat setting calls for.
It’s common for furnaces to fail to keep up when the weather outside is very chilly. They might run constantly yet still fail to keep up. Now there may be nothing wrong with the thermostat per se. And, there might be nothing the matter with the furnace either. The issue might be that your central heating system is too small to overcome the entering cold from outside. Again, a very cold day can make it feel inside like there’s no heat.
You may be getting SOME heating, but not enough to hold room temperature at the desired value.
If your house lacks enough insulation, this worsens the Honeywell thermostat not heating up issue. Indeed, much warmth leaves through cracks around windows, walls, and doors. Thus, the furnace works harder to bring the house up to the set temperature. Indeed, there may be many BTUs leaking in in this way. So many BTUs, that the central heating system cannot backfill. The furnace cannot thus, maintain the set temperature. So, your thermostat never reaches that set heating temperature.
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