Troubleshooting Carrier Furnace Codes 33: Get Your Furnace Running Again

The operation of your home’s central heating system is heavily dependent on digital feedback and controls, be they gas or electric. Any deviation from this delicate balance can result in a wide variety of issues arising. Thankfully, these problems are usually quite simple to solve and therefore require minimal time, expense, and effort to put right again. Whether you have just moved into a new home or are intending to sell your current property soon, it’s always worth getting to know the idiosyncrasies of any appliances beforehand so that you won’t be caught unawares. This is especially true when it comes to something as crucial as heating. In this article, we will cover some common problems relating to furnace codes 33, what they mean and how you can troubleshoot these issues at home again with ease…

What does code 33 mean?

When you have a central heating system fitted, the main device is usually called a furnace. This piece of equipment is connected to a control board called a thermostat which monitors the temperature of your property and is in turn connected with the furnace. If you have a furnace that uses a digital thermostat, then one of the most common codes you may see is code 33. This means that there is a problem with the heating system being caused by the furnace being out of calibration. Code 33 is a very general description that could cover a wide variety of furnace faults, but the primary issue is that the furnace is not turning itself off when it should. The thermostat is set to a certain temperature and the furnace is supposed to turn off once the temperature inside the house has reached that level. If the furnace is not turned off, it will keep running and use more fuel than necessary, which can be very costly. The furnace may also cause the air quality in your house to deteriorate because the excess CO produced by the furnace will not be vented outside as it should be.

Carbon monoxide leak

One of the most dangerous furnace issues you may experience is a carbon monoxide leak. This toxic gas is naturally produced when fuel is burned and the furnace fan is supposed to expel the CO outside the home, but sometimes it can fail to do so. A CO leak is not always accompanied by an odor, so it may go undetected and put the health of anyone in the house at risk. The only way to be certain that your furnace is not leaking CO is to have it checked by a professional. A faulty furnace may also not be able to operate at the right temperature, which can cause damage to the furnace itself and any connected appliances, including your air conditioning system. A furnace that does not operate at the right temperature will use more fuel than necessary and will produce excessive heat, which may cause damage to your home.

Electronic control problem

Another common furnace issue is the thermostat not being able to communicate with the furnace. This may be because the thermostat is old and has reached the end of its lifespan, because the furnace is not receiving power, or the thermostat is malfunctioning in some way. There are a few things you can do to check and hopefully rectify this problem at home. First, you should make sure that the furnace is receiving power. The first step is to check the circuit breaker or fuse box. If the breaker is tripped, reset it. If it is not tripped, then the problem may lie with the furnace’s circuit. You may need to call a professional to determine what the problem is with the circuit. The next step is to check the thermostat. Make sure the thermostat is plugged in and the wires are connected properly. Check the thermostat’s manual to make sure you have it set up correctly. If the thermostat passes these tests, then you may need to have the furnace serviced by a professional.

Furnace overheating

A furnace that is overheating may be due to a variety of reasons. The flame inside the furnace may be too large, which will put too much stress on the motor and increase wear and tear. There may be excess debris around the furnace, which will cause the furnace to work harder and therefore produce more heat. The furnace filter may be too dirty and need replacing. The filter may also be blocked with lint, which will prevent the motor from receiving enough air. The motor may also be faulty. If the filter is blocked, you will need to clean or replace it. You may also need to clean out any excess lint around the furnace. You may also need to replace the motor. The best thing to do is to call a professional to make sure the furnace is not at risk of catching on fire.

Bad gas valve or gas sensor

In addition to the thermostat and furnace, certain models of furnace also have a gas valve, which is responsible for regulating the flow of gas to the burner. If the gas valve is faulty or broken, the furnace will not ignite. If the gas sensor is faulty or broken, the furnace will not shut off. Both issues can be problematic and can also be solved by a furnace repairman.

Incorrect furnace calibration

If the furnace is not calibrated properly, it will use more fuel than necessary to heat the house. This can be due to the thermostat not being calibrated correctly or the furnace having the wrong calibration. To calibrate the thermostat, consult the manual. To calibrate the furnace, turn the power off and then open up the furnace and follow the instructions listed there.

Electronic control failure or malfunction

Another issue that can occur is with the furnace’s electronic control failure or malfunction. The furnace may not respond to the thermostat and therefore may not turn on or off when it is supposed to. You may need a professional to fix this problem.

Electronic motor problem

Finally, you may have an issue with the furnace’s electronic motor. If this is the case, the furnace will run, but the blower will not turn on. This can happen if the motor is broken or if the circuit board inside the furnace is not receiving power. You will need to call a professional to fix this problem.

Concluding Thoughts

The furnace is one of the most important appliances in your house, and as such needs to be maintained and checked regularly. It is important to keep a close eye on any furnace issues as they can cause a great deal of damage if they go unaddressed for too long. Whether you are in the process of moving into a new home or you are trying to sell your current property, it’s always best to get familiar with the appliances beforehand so that you won’t be caught off guard by any furnace issues.