The Honeywell RTH9580WF thermostat, showing that the Heat is ON.
You might notice that you have no heat even though the fan in your furnace is blowing when the thermostat calls for heat. This can happen for many reasons. Incorrect wiring, tripped circuit breakers, blown fuses, loss of gas supply, burned out heating elements, or a broken HVAC system could cause this. Here, we describe some of these causes, and then offer troubleshooting procedures and repair hints to resolve them.
Some of the procedures below are highly dangerous if you don’t know what you’re doing. So if you’re not comfortable working with high voltages or natural gas, then please consult the appropriate professionals to solve your heating problem for you.
Note that the thermostat itself is rarely (if ever) the cause of this particular symptom. So we won’t be checking it out very much here.
The dust filter in furnaces often accumulates so much dust and debris that little air can pass through it. This in turn can trigger protection circuits, that shut off the heat source because there’s not enough air circulation to prevent component overheating. Thus, you might see the blower run, but only get cold air when you should be feeling warm air.
Though the furnace turns on, you may notice that the heating elements such as burners, electric coils, or heat pump compressor does not come on as well. This can happen due to a loss of electric power to said elements due to tripped circuit breakers, failed heating elements, broken relays, or a faulty control board. Or in the case of gas furnaces, it could be a loss of gas supply or faulty ignitor (the device that lights the gas coming out of the burner when the t-stat calls for heat, and again, faulty wiring or broken control board.
Dirty heat pump coils, 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. In extreme cases, this feels like there’s not any heat at all being produced.
It’s common for furnaces to fall behind 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 t-stat per se, or the furnace either for that matter. The issue might instead 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 not heat.
You may be getting SOME heating, but not enough to hold room temperature at the desired value.
As should be clear, the Honeywell thermostat not heating up problem in homes has many causes. Plus, most of them lie beyond the thermostat. A poorly insulated home, a furnace that’s too small, leaky windows and doors also contribute. All of these make the HVAC system work too hard to heat your home. In many homes there’s little coolness to spare due to poor HVAC sizing. Sadly, the fix for this often costs a lot. Why? Because it means replacing windows and doors, or adding more insulation. Or you may need to upgrade your furnace or add more supplemental heaters to your home.
But we hope that now, you know what might cause the Honeywell thermostat not heating up your home issue. Knowing the causes often helps in choosing the right fixes. Even though the best fix may cost the most, at least now, you have the data in front of you. Good luck, and choose the fixes wisely.
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