There is a list of possible breakdowns or operating problems which you may encounter having Janitrol furnace. It is a short manual on Janitrol furnace troubleshooting as it gives you ideas of finding the reason of a problem and a solution in one place.
The possible problems are given as situations described with details as you see them when you operate the furnace. Some of breakdowns can be checked by any user like filter location or correct size. If there is a problem associated with circuit boards you should ask a qualified technician for help. Serious repair should be performed by a specialist.
Smell of Gas Coming From the Furnace
If you suspect gas is leaking from your furnace, shut off the furnace, open the windows to ventilate your home and call a furnace repair company. If the gas seems to be leaking from the main gas valves, call 911 to report a gas leak and evacuate your home. Gas leaks can be fatal, either causing an explosion or killing you slowly via carbon monoxide poisoning.
Just because you don't smell gas coming from your furnace doesn't mean there isn't a leak. Carbon monoxide is odorless. Consider installing a carbon monoxide detector to keep you and your family safe
Furnace Doesn't Blow Hot Air
If your furnace seems to only emit lukewarm or even cold air, multiple causes may be at play. Check your filter to be sure that it is not too dirty, is the correct size and is installed properly. All of these factors can cause restricted air flow.
A faulty thermocouple or flame sensor can also cause a furnace to fail to heat. The burners won't ignite if either of these parts malfunction. If the fan for your furnace is blowing but you cannot see any flames within the unit, the problem most likely lies in the thermocouple or flame sensor. They should be replaced.
A quick and simple fix might also solve the problem: Check the thermostat to see whether the heat setting says "on" or "auto." If the thermostat says "on," the fan may run even when the furnace is not burning. This will give the impression that warm or cold air is blowing through the vents. In the "auto" setting, the fan only runs when the furnace is ignited.
Finally, the air ducts might leak, causing the air to dissipate before reaching its final destination: The rooms in your home. The leaks can happen anywhere in the duct system, but a professional should be able to detect the source of the problem
Dirty Flame Sensor
Probably the most common issue when dealing with a furnace that will not stay lit or ignite consistently is a dirty flame sensor. The flame sensor acts as a communication vehicle with the circuit board and tells it when a flame is lit inside the furnace. When the sensor gets rusty or dirty, it cannot properly detect the flame and causes the furnace to malfunction. A clear indicator of a dirty flame sensor is when the furnace quickly cuts off two or three times a day during the normal heating cycle. The furnace attempts to turn back on and start a cycle again, but shuts off moments later. Most households that do not have annual maintenance performed in over a year or have pets will often run into this problem until a qualified service technician cleans the part. It is not a major issue, just a pesky one.
Bad Circuit Board
If all the above options are not the issue, then there may be a problem with the circuit board inside the furnace. A qualified technician should check the furnace as it is unsafe for homeowners to perform this task. Many circuit boards have an LED code that flashes during a furnace malfunction. Typically, it can be viewed through a sight glass about the size of a quarter on the lower door of the furnace. The code should give an indications of what is causing the furnace to lock out and not heat your home
The pressure switch is a round shaped control mounted near the top of the furnace close to the draft inducer fan. Normally, there is a tube on the pressure switch coming off the face of the furnace or draft inducer. From time to time, this tube can become blocked by a spider’s nest or debris and cause the pressure switch to work improperly. This problem could indicate a major issue with the furnace or could simply be a bad pressure switch.
Lack of Combustible Air
Each furnace requires a certain amount of combustion air to allow the flames to breathe properly. There is a method requiring total BTU’s and square footage of space feeding the gas appliances. If the space is not large enough, then it can cause the furnace to malfunction. The problem can usually be remedied by opening the furnace room door or adding vents to the room to allow more air into the space. In other occasions, air can be added from the exterior if it is accessible. The issue is that unconditioned air pushes into the home even when the system is not running. However, different types of damper systems can eliminate this type of issue. This is normally not an issue with a condensing furnace that has two PVC pipes to the exterior. These systems bring their own combustion air from the outside to feed the flames, thus they do not require combustion air from inside the home. If it only has one PVC pipe (exhaust only), then the furnace room requires combustion air. When you have a problem with a condensing furnace not staying lit, you may want to check the PVC pipe on the outside of the home to check for an occlusion (birds nest, kids toy, wasp nest…etc.).
Air Flow Restrictions
Another cause of this issue would be lack of air flow causing the furnace to overheat. The furnace has a control set to turn off the burners when the heat exchanger reaches a certain temperature. In most cases, the blower to the furnace will continue to run so it can cool down. Once it reaches the set cool down temperature, the burners should automatically reignite. If this continues to happen over time, the high limit control may malfunction and not allow the furnace to reset. At that point, it needs replacing by a qualified HVAC technician. The most common cause of an air flow restriction is simply a dirty filter. It is recommended homeowners visibly check their filters on a monthly basis. If the filter appears to be clogged or blocking air flow, then it must be replaced. In more extreme weather, homeowners are urged to check the filter more often due to longer furnace cycles. If the filter still appears relatively new upon checking, then there is no need to immediately replace it.
Other air flow restrictions, such as a dirty “A” coil, lack of return air, inadequate duct work, dirty blower wheel must be repair by a qualified service technician. This must be determined through static pressure measurement performed by the technician