Category Archives: Furnace Repairs

Help! My heat is not working. I set my thermostat to 69 but my heat only gets up to 67 then it stops. What is wrong?

This sounds like a common problem that we run into many times during the heating season. It is especially common for people with image of digital thermostatheat pump systems. A heat pump system typically has two different heat sources, the primary heat and the secondary heat. The primary heat is supplied by the heat pump which is just an air conditioner in reverse gear. The secondary heat is usually electric heat strips similar to the plug in space heaters you find in many retail stores. This type of secondary heat is what is called radiant heat and is very inefficient. You can tell how frequently your system uses radiant heat by how high your electric utility bill gets in the winter.

This secondary heat is sometimes referred to as emergency heat or AUX heat on your thermostat. It Picture of resistance heat stripsusually will have an indicator light or some other indication on touch screen thermostats. It can also be the primary source of heat if the thermostat is manually set to AUX HEAT or EM HEAT. Setting this mode will turn off the heat pump and only use the secondary heat. But this is very expensive so only use this if your heat pump is not working and until the service technician can get it back up and working properly.

In our case, what is happening is that the heat pump is not working and the system is relying only on the secondary heat. With a properly matched thermostat, the internal program recognizes when the heat pump is struggling to heat the house in cold temperatures and initiates the secondary heat to help the heat pump. The program also limits this help to when the actual house temperature is 2 or more degrees below the set temperature. This restriction, which is built into the thermostat program, is why the house will never get all the way up to the set temperature with the malfunctioning heat pump and the thermostat on the normal settings.

The situation does require further investigation as to why the heat pump is not working, but the information provided here is not enough to make a proper diagnosis. That will require someone to put their test equipment on the unit. The home owner can switch the thermostat to AUX HEAT in the meantime and it will keep the house at the set temperature, but it will be very expensive to leave it that way for too long.

Top 4 HVAC Repair Myths

  1. A technician said my coil is rusty therefore I must have a leak. Although likely to be true, it is not 100% accurate. The coil rusts when too much water or ice builds up on the coil over time. Ice can build up on the coil for other reasons, not just for leaks. Air flow has just as much impact on creating a frozen coil situation. Crushed ducts, poor design or dirty air York Air Conditionerfilters can all prevent enough warm air from flowing across the coil to prevent it from freezing. Proper maintenance and routine filter changes can help prevent frozen coils.
  2. My Capacitor is not swollen so it must be good. Not necessarily. A capacitor can be weak but not dead. A weak capacitor can wreak more havoc than a dead capacitor. Usually a dead capacitor will prevent the motor from running. Whereas a weak capacitor will allow the motor to run under poor conditions and quickly shorten the life of the motor. Motor replacements are expensive.
  3. A technician said a UV light would prevent dirt in my ducts. While a UV light helps prevent bacteria from growing on your coil, it does not prevent or destroy dust particles. Those pass the light unaffected and build up on motors and insulation that allows mold growth.
  4. I don’t need to maintain my heating or air conditioning system until it stops working. Although this is the choice most homeowners make, it is incorrect to assume the system will run fine without maintenance. Hidden dangers build up every year that a system goes without maintenance. Capacitors start to go weak (see item #2), compressors start to run hotter, drain lies build up with mildew. Delaying the maintenance will likely force the homeowner to spend more money on major repairs sooner than would be normal for a well maintained system. Maintenance does not guaranty your system will not need any repairs, but it does improve the life span of one of the most expensive systems in your home. You change the oil in your car every 3000 miles, why wouldn’t you have your system cleaned and inspected every year too.

ALEXANDER HEATING AND AIR CONDITIONING

919-886-4822

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Are You at Risk of Carbon Monoxide Poisoning?

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  • Have an older home?
  • Is your furnace over 20 years old?
  • Do you have a carbon monoxide detector?

Don’t be like one of our recent clients!!

After installing a carbon monoxide detector, it went off immediately that night. The gas company came and read 4 times the allowable limit in the house. That is a significant risk to life. All due to a hole in the furnace heat exchanger. This deadly situation was avoided when we replaced their 25 year old furnace, saving the family from a high probability of carbon monoxide poisoning or even death.

Don’t risk your family’s life.

Call Alexander Heating and Air Conditioning today for a furnace check up. We will inspect your heat exchanger and make sure it is safe for you and your family.

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My Furnace Stopped Working!

Furnace Problems?

You wake up in the middle of the night shivering cold. Throwing the blankets aside you rush to the thermostat only to find the set temperature is 70 but your house is now below 60! The

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furnace is either not running or blowing cold air.

But before you go call an HVAC company and spend hundreds of dollars for emergency hours fees, how about taking a minute to figure out what might be wrong with the furnace?

Here’s a little article I wrote today about some furnace diagnostics. It may help you know if the HVAC person who comes to your house actually knows what he is doing. this can save you a lot of time and money.

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