Question about Heating & Cooling
DO NOT HAVE 24 VOLTS BETWEEN COMMON AND GREEN , BLOWER RUNS CONSTANTLY EVEN WITH THERMOSTAT IS TURNED OFF .
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Posted on Jan 02, 2017
YOU COULD EITHER HAVE A THERMOSTAT PROBLEM OR FAN CONTROL PROBLEM.TURN THE POWER OFF AT THE FURNACE AND TAKE THE THERMOSTAT OFF THE WALL.MAKE SURE YOU MARK THE WIRES SO YOU KNOW HOW TO HOOK IT BACK UP AGAIN.RESTORE POWER TO THE FURNACE.TOUCH THE WIRES THAT WERE HOOKED TO THE R & G TERMINALS ON THE T-STAT TOGETHER AND HOLD THEM THERE.OBSERVE THE OPERATION. WHEN YOU TAKE THEM APART DOES THE BLOWER STOP?TRY IT A FEW TIMES. IF IT CONTINUES TO START AND STOP YOU GOT A BAD T-STAT.JEFF
Posted on Dec 15, 2007
Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?
Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.
Than let me know firstname.lastname@example.org
Posted on Nov 22, 2008
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
Sounds like they wired it direct to line voltage , it should run through a sequencer or fan relay to cycle on and off , your seq./relay could be stuck closed to but unlikely being it was just repaired , call the service company back before you do anything they are responsible.
Posted on Apr 11, 2009
SOURCE: Blown Transformer heat pump
blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you
Posted on Jul 26, 2009
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