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Old 04-25-2012, 05:43 PM   #1
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ok you turn the unit on, you can here the gas fire light, but no blower turn on. you can turn the fan on and the blower works, this is a 5ton unit, what need to be checked.

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Old 04-25-2012, 06:37 PM   #2
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make? model? of everything inside and out. and pictures always help

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Old 04-25-2012, 06:45 PM   #3
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fan limit control within the furnace if not you lost the LO or Medium spped winding on the fan...stat fan call is the hi speed winding for AC only heat works the other 2
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Old 04-25-2012, 07:00 PM   #4
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the unit is out side on the roof. been working fine for years.

the other night it went on at 8.30 you can hear the heater, heat up, but the fan never kick in, after 10mins the system turned off. same thing happen last night. i turn the heater off, and turn the fan on, and the fan worked. but when you run just the heater, the fan does not kick in. sound like a relay problem. be I don't want to go three storie up unless I know what to look for. its a 5 ton until. all in one, heat/ac. and the AC work fine. made by sears.
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Old 04-25-2012, 08:09 PM   #5
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if it is an actual rooftop then might be just a fan limit disc and not the fan speed and or an actual fan relay..pull the stat off the subbase jump the heat up there at the terminals strip..keep in mind the fan during the heating comes from a temperature disc or time delay on a solid state relay oard in the control section..not the stat as cooling does with the hi speed...check th supply fan might change the speed wire from LO to Medium if it is the LO winding on the supply fan
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Old 04-25-2012, 10:04 PM   #6
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Do you have a photo on what your talki g about
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Old 04-25-2012, 10:10 PM   #7
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turn the fan on....... till you figure it out.... whatever brings the fan on in the heating mode is not working....... ....... post a schematic ....its an easy fix
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Old 04-25-2012, 10:15 PM   #8
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Easy fix but how to do it
No manual or video to show me
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Old 04-25-2012, 10:49 PM   #9
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thats why there is contractors to help you...unless you can give us more info.....we cant help...

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