No A/C from Coleman

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Old 07-24-16, 04:26 PM
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No A/C from Coleman

Came home to a horrible burning smell coming from the ducts. I immediately check inside unit for smoke/flames...nothing. The coils are warm and the unit smells like burnt plastic so I switch thermostat off and realise after a few minutes that the fan is still running. I check to make sure it is on auto at thermostat...it is. The only way to get the fan to stop running is to flip the breaker...any ideas?
 
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Old 07-24-16, 04:39 PM
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Please try to explain what happened more clearly. Is this a split system (outside unit and air handler/furnace)? You mentioned "coils are warm". What coils? Is the blower (fan) on the air handler/furnace running? If a split system, is anything running on the outside unit? Were you able to determine where the burning smell was coming from?
 
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Old 07-24-16, 05:01 PM
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It's a split system. The burning smell seemed to be coming from the inside unit. It was not overpowering so I am thinking whatever happened did so shortly after we left. Outside fan runs and the inside fan runs. The inside fan is the one that will not stop running unless I flip the breaker. The evaporator coils on the inside are normaly cold when the a/c is on but was warm when I checked. Everything seemed to be fine earlier in the day. We left for about 2 hours and came back to a burnt smell all throughout the house air was working fine when we left.
 
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Old 07-24-16, 05:12 PM
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It appears that you have 2 separate problems. First, it appears that your compressor likely isn't running since the evaporator coil is warm. The contactor is engaged since the condenser fan is running. Your second problem is the blower motor is running constantly and there is a burning smell.

Have you gone outside and listened to the outside unit to try to tell if the compressor is running? The blower problem may be a sticking fan relay, but it's impossible to know for sure without knowing the make/model of the air handler/furnace.
 
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Old 07-24-16, 05:21 PM
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I just came back in from checking the outside unit. It will not come on now at all which is confusing because before turning the system off to begin with I made a point to look out at the outside unit to see if the fan was turning. But now...nothing...no sound from the outside unit at all.
 
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Old 07-24-16, 05:24 PM
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It's a Coleman Model EB15B
 
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Old 07-24-16, 05:24 PM
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To begin to diagnose why the outside unit isn't coming on, it will be very helpful if you have a multimeter and know how to use it. Do you have a multimeter and know how to use it?
 
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Old 07-24-16, 05:30 PM
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Nope! We may have one around here somewhere but as to using it....ummmm...I guess the best I can do tonight is sweat it out and call someone in the morning.
 
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Old 07-24-16, 05:36 PM
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I was able to find a copy of the installation manual for your furnace. It includes a wiring diagram and your furnace does use a blower relay. Just to rule out the thermostat as the cause of the blower running continuously, can you try removing the thermostat (most newer thermostats attach to a mounting plate/bracket so it's easy to remove it)? If the blower continues to run with the thermostat removed, then the blower relay is the most likely suspect.
 
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Old 07-24-16, 05:44 PM
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It's a digital thermostat...I just popped it off the bracket. Fan still going.
 
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Old 07-24-16, 08:49 PM
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The EB15B is a 15kw electric air handler. You may have a defective heat sequencer relay.
This will be a challenging DIY repair.

If you intend to service this yourself we'll need large well lit pictures of your wiring inside the air handler. You will need to post them on a hosting site. http://www.doityourself.com/forum/electrical-ac-dc/534445-how-insert-pictures.html


The inside should look like the diagram below. Before opening any covers you must turn off the two circuit breakers at the unit.

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