my furnace is cycling too often - http://www.hvacmechanic.com/ Forums
Original message
| cdy5678
 |  "my furnace is cycling too often"
, posted Mon 10 Nov 08:43  
my furnace is cycling way too often.it starts up for about 30 secs. turns off then does it two more times. does that every 5-10mins. and when i turn up the thermostat about 5 degree warmer than the inside temperature it does the same cycle over an over till it reaches the interior temp. so it doesnt stay on till the temp is reached it just keeps on turning on than off over an over again.please help
need help
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Replies:
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| GallatinAC
| "Re(1):my furnace is cycling too often" , posted Tue 11 Nov 10:38
Need more info.....may be cycling on high limit....What is the make and modle, what type of system ect.
Gallatinac.com
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| | cdy5678
| "Re(2):my furnace is cycling too often" , posted Tue 11 Nov 10:47
its a luxaire 92 hvac model#pcluld20n120a i had a tech. come out lastnight and look at it i changed the high limit switch cleaned the flmesensor and new filters nothing happend the tech said it was a bad blower motor the motor blows air but he said theres a cut off thats bad inside the motor is that possible?
need help
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| | wingnut_2u
| "Re(3):my furnace is cycling too often" , posted Tue 11 Nov 16:17
if the blower motor is drawing max amps, YES
if you have a bad run capacitor it can cause the motor to overheat.
if there is play in the blower shaft or bearing drag it will overheat.
bad cutoff bad, never happened with me.
thermal limit inside motor protects it from burning up and boiling the oil out. check the first two things before changing the motor due to a bad thermal overload switch.
Masters Heating & Cooling
Caldwell/Boise Idaho
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| | jmar
| "Re(4):my furnace is cycling too often" , posted Tue 11 Nov 18:59
First and foremost what is the ^T (Delta T) if the furnace has to high of a ^T what then needs to be determined if their is sufficent air supply such as a cfm test BTU Output/1.08 X ^T. Now as far as the blower, are the blades clean in the wheel or are they full of S!@$. Next is the air filter clean? Thirdly was the high limit ohmed out to see if it was bad? Was the flame sensor u/a checked after it was cleaned to see if their was still an issue? Some blowers have a reverse flow switch mounted into the blower housing, if it trips its usually due to excessive heat through time or plugged air filters. Hope this helps, my moddo gather the data and facts first then replace what neeeds to be replaced.
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