Question about Heating & Cooling
I have a problem with my carrier weathermaker 9200 furnace which causes the LED display on my carrier thermostat to go blank. Prior to the thermostat going blank it will flash E2 which indicates that there is a brownout condition or too low voltage to my thermostat. The manual says to double check wiring and check for 24 vac between R and C. In addition, rather than continuously running, my furnace continues to cycle on and off before getting to the correct heating temperature. I replaced the thermostat but am still having problems with the furnace running until it reaches desired temperature. How do I check for 24 vac and could this be the problem with the cycle time on the furnace?
Yes you are right the control voltage of your furnace is 24 volts. Really without a load on the transformer usually runs 28 volts then you put a load on it and it drops down to 24-26 volts. Check the voltage between the R terminal and the W terminal with the selector switch in heat mode. Or move the thermostat switch to heat. R to C would do it also. You could also do the voltage check right at the transformer one side of the transformer is 120 volts and the other side is 24. Look for the black and white wires that is the 120 volt side the blue and yellow or off colors is the secondary side.
Now if it checks low say 24 or 22 your gas valve needs min. 24 volts to hold open the valve that allows the gas to flow into the burners. So if one of the symptoms is related to burners come on for about 3 to 5 min. then shut down and the fan keeps going it is loosing the necessary voltage to hold open the gas valve.
One more thing make sure the air filter is clean as this will cause the heat to build up in the heat exchanger and hit the high limit safety device and cut the gas off. Until the air cools enough to allow the high limit to reset then the gas valve will open and start the process all over again. Dirty A-Coil will do the same thing as the air goes through the coil to get to house. let me know how it goes ken
Posted on Jan 18, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jun 06, 2016 | Carrier Weathermaker 8000 Gas Furnace 125k...
on Jan 08, 2015 | Heating & Cooling
Sep 12, 2014 | Heating & Cooling
Jan 07, 2014 | Carrier Heating & Cooling
Feb 22, 2013 | Carrier Humidifiers
Feb 17, 2013 | Heating & Cooling
Mar 25, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...
Oct 06, 2009 | Heating & Cooling
Dec 10, 2008 | Heating & Cooling
1,969 people viewed this question
Usually answered in minutes!