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Old 05-15-2011, 07:47 AM   #1
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E2 code on Carrier OMTSTAT_3 thermostat


Hi All. Any help is appreciated with my thermostat. An E2 code appears when in cool mode for my heat pump but works OK in heat mode.(heat pump will kick in and heat.) The thermostat just clicks and flashes E2.
I believe it is a Carrier programmable tstatccpdf01-a thermostat that controls a Carrier dual fuel model 58mxa Weathermaker 9200 and a 38byb split system heat pump. Unit was installed around 2000. Serviceman worked on the heating side of the heat pump this winter. A fuse was blown on the circuit board inside the house and he said a wire was loose on the outside unit.
If I select auto mode the same E2 code appears.
Transformer appears to have about 24+ volts at R and C wires at the thermostat. Actually 27.5 volts.


Last edited by strikeeagle; 05-15-2011 at 10:53 AM. Reason: added contents
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Old 05-15-2011, 08:59 AM   #2
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E2 code on Carrier OMTSTAT_3 thermostat


Depends on the brand (and model) of thermostat.

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Old 05-15-2011, 09:32 AM   #3
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E2 code on Carrier OMTSTAT_3 thermostat


if you have a owners manual it should explain E2 in the manual. This is what I found.....Brownout condition or too low of voltage to thermostat. Double check wiring and check for 24 vac between R and C. E2 will clear 15 sec after proper voltage is restored.

check you manual or post model number stat.
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Old 05-15-2011, 10:55 AM   #4
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E2 code on Carrier OMTSTAT_3 thermostat


Can I ask if the reversing valve needing be energized during cooling mode could equate to not enough power as you suggested, tech?
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Old 05-15-2011, 11:05 AM   #5
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E2 code on Carrier OMTSTAT_3 thermostat


it could be the reversing valve is bad and has a lot of resistance when power is applied causing the overall voltage to drop and cause the code. Yes that is possible. It could be many things such as the reversing valve sticking and causing a pressure switch to open.

Here is a link to your homeowners guide...OMTSTAT 3
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Old 05-15-2011, 11:10 AM   #6
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E2 code on Carrier OMTSTAT_3 thermostat


tech126 is probably more familiar with your stat then I am. But I would check for loose or corroded wire connections at it and at the air handler and outdoor unit.

tehn if none were found, ohm out the contactor coil and RV coil(turn off line voltage first).
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Old 05-15-2011, 11:15 AM   #7
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E2 code on Carrier OMTSTAT_3 thermostat


'Preciate it. Here's one on Totaline stats saying the stat is bad and to replace it on an E1 or E2 fault code.

7. Replace your thermostat if you see an "E1" or "E2" error code on your screen. These codes appear when the sensor circuit is opened or shorted.


http://www.ehow.com/how_8062461_trou...hermostat.html
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Old 05-15-2011, 11:17 AM   #8
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E2 code on Carrier OMTSTAT_3 thermostat


Doc, the stat is a OMTSTAT 3 per the op subject line. The code refers to a low voltage situation.
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Old 05-15-2011, 11:19 AM   #9
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E2 code on Carrier OMTSTAT_3 thermostat


I'm always learning, thanks.
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Old 05-15-2011, 11:22 AM   #10
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E2 code on Carrier OMTSTAT_3 thermostat


Eagle, do as beenthere suggested and check all the wiring connections in stat, furnace, and HP first. Then check the resistance of the contactor and RV coil.

Also, add more info in a new post instead of updating your old post. It is hard to tell there is new info present unless watching closely.
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Old 05-15-2011, 12:37 PM   #11
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E2 code on Carrier OMTSTAT_3 thermostat


Sorry, I will start a new window the next time I add info.

Mike
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Old 05-15-2011, 01:28 PM   #12
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E2 code on Carrier OMTSTAT_3 thermostat


Best to keep it all in one thread.
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Old 05-15-2011, 01:30 PM   #13
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E2 code on Carrier OMTSTAT_3 thermostat


Quote:
Originally Posted by beenthere View Post
Best to keep it all in one thread.
Correct all the same thread just a new post.
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Old 05-15-2011, 01:42 PM   #14
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E2 code on Carrier OMTSTAT_3 thermostat


Got it. Same thread, new post.

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