I have a York high efficiency furnace that is not firing all the the time. The unit is about 4 to 5 years old & has been doing this for a few months now and getting progressively worse. (model # GM9S08B12DH11G) The trouble code light inside is blinking a rapid red, indicating a Twinning Error, Incorrect 24V Phasing.
Has anyone worked on this furnace because the error would indicate that the positive 120 volt and the neg 120 volt is swapped , these units will also do this when the ground wire to the furnace or gas valve or furnace or @ the panel is lose , corroded , or missing , the gnd must be present to open valve , I am aware that ac is is not usually polarity sensitive but in this case it most certainly is …have seen many time and know it to be true
How to Identify and Resolve Common Issues ?
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A faulty or stuck pressure switch could be the cause. A pressure switch is a safety device that can stop the operation of the furnace if there isn`t enough airflow for proper combustion. These switches can become stuck open or fail. Cracked, clogged or broken hoses running to the pressure switch may be the problem.
The simple answer is “yes” – but for a good reason! High efficiency furnaces run more often to save energy and reduce your utility bills. By running more consistently, the furnace can operate at an even pace throughout the day rather than working hard in spurts.
If your gas furnace initiates the start cycle but does not fire up, it`s likely because of a faulty, damaged, or dirty ignitor/sensor. This is a very common furnace problem—you can try to clean the sensor and replace the ignitor.
A high-efficiency furnace should be running at least 80% of the day if not longer.
If your furnace shuts off after a few minutes and starts more than eight times an hour, it may require repair. Common causes of furnace short cycling include restricted airflow, a malfunctioning flame sensor, or a poorly placed thermostat.
With all that being said, if there are no extreme factors involved, the average run time for a furnace is 10-15 minutes per cycle. Your furnace may need to run two to three times an hour to maintain your desired temperature if your home has average insulation.
Industry research shows some expected time frames for how long a furnace runs during a particular cycle. Running 10 to 15 minutes per cycle seems acceptable. So is running as long as 20 minutes. Even running every seven or eight minutes may not be a problem, as other factors could lead to more frequent cycling.
Because they use sealed combustion, the contractor will add PVC pipes in place of the traditional metal pipes. Otherwise, the exhaust from a high-efficiency furnace will corrode the metal. And because these furnaces will produce condensation, they also need drains.
Furnace short-cycling refers to a furnace that`s switching itself on and off too frequently. It`s normal for a furnace to turn on and off periodically. They are designed to cycle on and off, but a standard home furnace should only turn on and off between three to eight times per hour.
To find out your furnace`s efficiency, first check the vents. If your furnace vents out of a metal pipe and/or chimney flue, it`s a low-efficiency or “standard” furnace. If it vents out of a plastic PVC pipe, it`s high-efficiency.
If your furnace shuts down after a few minutes, it`s likely due to a faulty or unhygienic flame sensor. This crucial component intends to monitor the gas burner. Also, when a flame sensor cannot detect the burner, the furnace runs for a few moments before shutting down and restarting.
When your furnace is trying to regulate the temperature in your home it will have to turn on and off regularly. On average this cycling should occur anywhere from three to eight times an hour. There are many factors at play that determine how often your furnace will cycle in the winter.
If you find your furnace blowing cold air, you may have a dirty or clogged air filter. To make sure, remove the air filter and inspect it. If it`s clogged with dust, clean it with compressed air or wash it in warm water with mild soap or just buy a new one.
Check your air filter. A clogged or dirty air filter can cause short cycling. A clogged or dirty air filter can strangle off airflow to your system. Reduced airflow can not only put strain on your system, but it can also cause short cycling symptoms.
According to ENERGY STAR, setting your thermostat to 68 degrees Fahrenheit (20 degrees Celsius) when you`re home is the ideal balance of comfort and energy efficiency.
A clogged filter is probably the most common reason for this problem, so it`s a good place to start investigating. Take a look at your filter and, if it`s really dirty and clogged, it means there`s restricted airflow to your furnace. This may be keeping it from being able to create heat.
Most likely, your furnace is making a clicking noise and not providing heat because your furnace`s spark igniter is trying to ignite your pilot light or burners but is failing to do so. In other words, there`s an ignition system malfunction that needs to be fixed. Otherwise, your furnace won`t start.
Check Your Thermostat
If your heating system will not turn on, the first thing you should do is check the thermostat. The thermostat`s battery may have gone bad, causing it to power off. If your thermostat is hardwired, a power surge, brownout, or brief power outage may have caused the thermostat to lose its settings.