Kicked on the A/C today. Noticed when I got home the house wasn't cool and no air flow coming from the vents. Came down to check the furnace. Yep Frozen! My first thought was filter or low freon. The furnace is flashing a code in amber. 4 short and 1 long flash. Book indicates blower motor fault. Any ideas? Thank for the help
Thx Bob Reynolds! I am in the middle of my thermistor repair, but have definitively found my issue. See this thread, posts 25 and 26....I'll update that thread mid week...including pictures.
My ECM module on my Carrier 58 MVP took a dump today as well.
Unfortunately I was under the gun, and didn't want to start guessing so I called my Local HVAC guy, since my furance is in the attic, and hard to work on.
Between him and I we were able to pull the blower ASM in about an 1.5 hours, pulled the ECM module, saw the burnt disc. Luckily he had the module at his shop close by. Swapped it in and back up in running.
If it hadn't been 58 in the house already, and 14F outside, I would of gone the DIY route.
Indeed the thermistor replacement fixed me up! I'll try to get pictures up as well later. First attempt didn't get enough solder to wick through the thermistor to the other side. Unit went out 48 hrs later because of poor connection.
I found I could pull the motor module out with it all mounted in just 2 min. Resoldered another new thermistor in and good to go since.
I have a carrier model 58mvp. The blower stopped working and I did a code check and got codes 41 & 44. After looking at some chats here I seen that it could be the thermistor. I have removed the blower and the motor
(GE CB02 09Cb ) no other makings on the motor. I looked at the thermistor and it is burned.
Here is where I am running into trouble I have a model SG349 and can not find a replacement, been looking on line for 2 hours.
is the a similar one that can be used?
I may not be correct on this but I think mine is 1 OHM/ 30 Amp but not 100% sure.
Any and all help to get this fixed will be greatly appreciated. It is suppose to get hot again middle of next week. I can take the heat more worried for my special needs dogs.
I wanted to find out if the issue I am having is related to the thermistor. I am under the impression the blower would not fire up at all if the thermistor or ECU were the issue?
The symptons I am having are every now and then with no rhyme or reason, my blower will not fire up when the thermostat calls for it to. The outside unit will be running but no air is being blow out the vents. I will reset the unit in the attic by pulling the breaker and popping it back in and that will usually get it going (sometimes takes a few tries). Any idea?
Okay I am at a loss ! I'm a tech but not a AC Tech so I get most of this info given - I have tried everything under the sun listed for this problem and still hitting a wall for a fix ! My air conditioner was working fine and all of the sudden the I heard a loud pop near the filter grill ,when I checked the filter it was bent from where it was sucked in - and it was completely full and and needed changing in a bad way - I'm guessing the popping noise was the filter because like I sad it was bent inward on the corner when I opened the door --- I the air unit outside runs and the inside runs and even putting out cold air ---- its just not cooling the house ---- No Ice --- No clogging ---- no water or dew anywhere ---- the module looks perfect (looks new) with no black marks and its not brittle looking like other threads to look for --- I metered the resistor and it has 1 OHM --- I checked power to motor and I got power going to motor - I also cleaned coils and checked the safety switch , I confirmed the thermostat works --- everything pans out A OKAY - Im at a lost of why it wont blow the cold air its producing ?? Any help is very much appreciated - thanks in advance!!!
I thought I'd add my scenario to the forum in case it might help others.
I ran into the same blower-not-working issue that seems common with this motor/ecm.
I was hoping my issue would be the common thermistor problem, and after a quick fix I'd be on my way. Unfortunately this wasn't the case for me, and I ended up with a full replacement of the module and motor.
I followed the troubleshooting flow chart in the furnace manual, and all the voltages on the motor connectors, and furnace control board were correct.
I took apart the motor, hoping to find the burnt out thermistor, and had a very hard time disconnecting the 3 pin motor connector from the control module. Finally I got it apart and noticed it was all burnt out - in fact one of the pins had broken out of the control module.
It seems something different happened to mine, and it was just toast. I replaced both the ECM and the motor - at a cost of $720 Canadian (just outside of Toronto). The bulk of the cost was the ECM.
I have a Trane TWE037E13FB1 air handler and I woke up to no heat yesterday. I checked the fuse and that was good it's getting power but the fan won't kick on, it was doing the jumping back and forth. I spun it with my hand and it started and ran for about 5min. before turning off again. Here are a few pictures of the ECM I pulled off the blower motor. I read that the thermistor goes bad but this one seems to look fine? Any other thoughts?
Some do not look bad but are bad- can not go by looks all the time . read all the post above good info. If you need to replace mtr think about going with a PSC mtr with new capacitor & a relay or contactor.
I have a 58MVP100 and the Motor Controller had a failed thermistor (black disk on controller). I ordered an "OEM" replacement from Repairclinic part number HK44ER158. It was NOT a GE be rather a Genteq. It had a standoff collar to make it fit and installed and connected just fine. But I am still getting the 4 short blinks and 1 long blink status light. Indicating a failed blower motor. When shorting our the thermistor on the old unit it works. Any insight is appreciated.
Sorry, I am new to forum. I have seen the threads on the ECM units. I have a thermistor that is bad but the number on it is "SG381". Does anyone know the correct replacement for it?
You may want to get that furnace checked by a Carrier or Payne or Bryant tech as a lot of them had faulty secondary heat exchangers. There was a Class action lawsuit as most of them rusted/rotted out and leak. Carrier owns all three companies.
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