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Where is the limit switch?

Blower is not working when furnace kicks on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Therinnaiguy
  • 1420 Answers

SOURCE: Coleman furnace blower runs continuously

You should be seeing 120 volts to the igniter. Anything less requires either a replacement of the transformer, start relay or control module.

Posted on May 30, 2008

  • 2461 Answers

SOURCE: Dayton blower fan repeatedly kicks on and off

chech the air filter is clean and the fan limit switch look to change fan limit

Posted on Dec 11, 2008

muttandjeff
  • 359 Answers

SOURCE: Rollout Limit Switch Keeps Tripping

have someone check the gas presure most likely too high no more than 11

Posted on Dec 17, 2008

machtcl1
  • 61 Answers

SOURCE: Goodman furnace GMPN080-4 Getting 4 RED blinks/Open Limit Swtch

You have a limit switch located in the furnace (a little bigger than a dime and located near the center of the front panel, sometimes the switch is mounted to a small fiberglass board) . There will be two wires going to it. They sometimes trip so often that they fail to automatically reset(due to dirty filters or undersized ductwork). You can SHUT OFF POWER TO THE FURNACE, then remove the two screws holding the switch in the furnace, pull the switch out of the furnace and tap on it and wipe it off.
The switch may work a few more times but should be replaced with the same size and type. You will see some rating printed on the switch somewhere. Write down all the numbers and get a replacemet from a furnace/AC supply house. If you have a meter and know how to use it you could check the switch for continuity.

Sometimes just a tap on the switch will get it going. There will also be a couple of rollout switches that could be tripped. They have little buttons on them to reset them. If they trip it may have other issues to be solved.
Hope this helps!
Matt

Posted on Feb 01, 2009

co7196
  • 3433 Answers

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

The thermostat is the controller.

Posted on Jun 19, 2009

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Make sure that there is not a manual limit that has tripped and needs to be reset. Roll out limits, and check primary limit. On some models if a limit is tripped the blower starts to run right away.
I don't know if this will fix it. But that is where I would start if I was working on this problem. Then I would check if the combustion blower starts and then if it makes the pressure switch. Then check if the ignitor is sparking or glowing and getting power to it. A good volt meter will help in checking.
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Sounds like limit switch issue. Furnace heats up, high temp limit switch opens, fan will stay on. GMP model is older and do not have the codes.
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Next time before shutting off power, try to find the limit, it has two wires that connect to a 1.5 x 2 inch card mount to the furnace fire wall. tap on it and see if the blower stops. If so replace the limit.

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Hello, looks like you limit switch keeps opening because your furnace is overheating, Check your air filter and blower wheel to make sure it is not dirty and make sure you blower motor is moving at the proper speeed. Usually when air flow is cutoff the limit switch will open.

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The thermostat is the controller.

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chech the air filter is clean and the fan limit switch look to change fan limit

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