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Old 02-13-2011, 10:43 PM   #16
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ECM Blower Motor bad


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Plus, you still need to fix the poor air flow of your duct system. Since thats what took out the module.
Good point. If I may ask what are some things to look for to determine the cause of the poor airflow aside from the filter which I change regularly? Thanks in advance and thanks for your help so far!
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Old 02-14-2011, 03:42 AM   #17
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ECM Blower Motor bad


The duct system itself. Post the sizes of your return an d supply ducts. They are most likely too small. Could also have crushed duct work, or kinks in the duct.

What size unit was there before the Coleman.
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Old 02-14-2011, 06:57 AM   #18
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ECM Blower Motor bad


Most interesting relevant post about variable speed fans. Worth a look:

Carrier 58MVP Blower Problem
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Old 02-21-2011, 11:39 AM   #19
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ECM Blower Motor bad


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The duct system itself. Post the sizes of your return an d supply ducts. They are most likely too small. Could also have crushed duct work, or kinks in the duct.

What size unit was there before the Coleman.

16". That all checked out when I went from a 1T to 3T A/C Unit. I had an electrician buddy of mine come out and the breaker for the A/C unit was going bad, think maybe that fried the thermistor?

To update: I finally received the new thermistor three days ago and soldered it in and tried the fan motor. While it now will turn on it slows and speeds repeatedly every few seconds so it's probably bad. I bought a PSC motor and am just going to go that route.
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Old 02-21-2011, 03:56 PM   #20
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ECM Blower Motor bad


The slowing and speeding up is from under sized, restricted duct, or too many closed or covered up registers/grilles.

A single 16" flex duct is border line for 3 tons. A static pressure test will tell you how bad your duct work is or isn't.
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Old 11-23-2013, 12:13 PM   #21
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ECM Blower Motor bad


My ECM motor was making horrible noises. It was still working but the house was taking 3 times as long to heat up. I took the ECM out and took off the back plate and noticed a ton of dust. Like my computer I blew off all the dust and it resumed working. I believe the electronics were confused by all the dust. I later saw in the manuel that every year I am supposed to vacume it out once a year.

I hope that helps someone.

I also had a small water leak and tightened my condensation tubes
then I had and no more leak.

Thanks to all the other posts (from other sites too) this gave me all these ideas so I didn't have to make call to the repairman. I hope this helps someone.
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Old 01-04-2014, 07:21 PM   #22
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ECM Blower Motor bad


I have a bunch of SG405 thermistors that replace Sg379 Thermistors
I sell them for ten bucks a piece call 800-584-1892 leave a message I I will
send one to you for 10.00 plus the price of a stamp.
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