Question about Honeywell Air Conditioners
Thanks for using FixYa. Perofrm this test--
Connect DATS Sensor to EMM-3 (optional).
a. Reconnect power to EMM-3.
b. If system is in Purge mode, press PURGE OVERRIDE on EMM3.
c. Verify SYSTEM LED is no longer flashing. This confirms proper DATS operation. (Flashing occurs in Idle and Fan modes only.)
Also see page# 9 & 10 from this link--
Honeywell EMM-3 zone controller
Please do accept the solution if the issue is resolved or else revert for further assistance.
Posted on Aug 28, 2009
check the outside unit (condenser) see if the fan and compressor are running. the compressor humms and you should be able to hear it. if it is running check the inside unit's coil to see if it is frozen or dirty. if it is frozen or extremely dirty then you have restricted airflow to the inside unit. Sometimes checking the coil is near impossible, i use an inspection mirror and headlight flashlight, then i wedge a chisel under the front of the drainpan (CAREFULLY! its plastic usually) so i can get my mirror in there and see whats up. On a furnace the coil will be on the very top and have 2 copper pipes running into it with one of them being insulated. hey also a dirty filter or prefilter can cause freezing.
Posted on Oct 10, 2009
There is a way to restore the Factory Defaults via the Advanced Configuration Mode. Be careful, this will require thorough knowledge of you system to reconfigure based on your particular system. Here is a link to the manual to assist you with the Advanced Configuration Mode.
Specifically, pages 6 & 7. Visit this link:
Posted on Feb 14, 2010
The stat that works is called the main and the other two are called slave stats. The stats must be set to heat or cool the same as the main. If you want one room to cool and one to heat , sorry. Need to upgrade to auto changeover. Is this AC actally a Heat pump?
Posted on May 06, 2010
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.
Posted on May 12, 2010
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