Blower cycles after thermostat is satisfied. only once each time ,but everytime

SOURCE: furnace

It's always possible that the limit "dial" switch is sticking leading you to believe that it's only at 150º.

How old is the furnace and when was it last cleaned.

SOURCE: recently replaced blower wheel and

First question first, NO! this is a simple problem and a common one to fix, just change out the outside contactor coil, the contactor has a thin layer of silver on them to prevent them from arching and sticking together, over time this thin layer burns through and stick the contactor and wont let go, till you replace the contactor coil,(20.00) 24-volt 40 voltage amp coil! YOU CAN DO THIS after you kill the power to the unit.!Thank-you-very-much!

SOURCE: Limit Swith on Coleman Central Heating and Air

Sounds like the limit switch is not bad ...... its just doing its job. You need to determine why he furnace is overheating. Are your filters clean? Is your blower wheel clean? Is your blower motor running fast enough? It might be set on to slow of a speed. The blower motor capacitor could be bad. Are all of your air vents in the house open? Are your return air registers blocked? Is your duct work properly sized? Put a thermometer in the return air duct. Note the temp. Now stick the thermometer in the plenum. Note this temp.. Subtract the high temp from the low temp. This number should fall within the temp. rise rating found on the data plate inside the the furnace on the same sticker as th model and serial numbers. If your temp. is above the suggested temp rise. you have an air flow problem. If it is within the suggested temp rise listed then your high limit control should be replaced.
Good luck

Ned C Cook

• 3433 Answers
• Posted on Jun 19, 2009

SOURCE: AC unit turns on blower doesn't come on

The thermostat is the controller.

t1m130

• 86 Answers
• Posted on Jul 26, 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
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

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