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Hi Joe,

I just bought the condo I'm in in December of last year.  Not sure how old the air conditioning system is.  I have a Hunter 44360 thermostat. I thought the heat source for my unit was all electric, but when I look at my property appraisal report and at info on other units in the development online, it says "electric, natural gas." (Not sure what this means.) I believe the actual heating motor/element is inside the ceiling in my kitchen (covered with a hatch).

Here's my issue (besides not knowing enough about ACs) - - I had been using my heat fine through the winter.  Actually, the heat wasn't coming on automatically as set and I googled and found that if I switched the back of the thermo to HE that it would come on at the temp set (that's why I thought my unit was all electric).  I have not been using the programming tools for the thermo - - I either bypass the programming by pushing the up and down arrows or by hitting the hold/return key to clear any programming.  So, anyway, now that it's heating up in Cali (the past month), I've been using the air without any issues until recently - - this past weekend I had the air on and it was cooling off (reaching the lower temps I set (75 degrees) and within about a half hour, it switched to heat without me touching it.  And today I went to work, and had the thermo set to cut the air on if it reached 80 (and had the thermo set at "cool" and "auto").  When I came home from work, it was more than 100 degrees in my home and the heat was on (even though the thermo was set to "cool").  

Any idea from what I told you what may be causing this?  I do have a home warranty and I will likely be calling them tomorrow.  I'm just wondering if it's something I'm doing.  It worked fine when it was just heat I was dealing with.  It even worked fine for a while using the air, without incident (probably a couple weeks).  

I appreciate your response.

Answer
Cecilia,

Briefly looked at your thermostat , if you have a Heat Pump System it suppose to be set at HP . STD setting is for Gas , Oil, electric, or hot water . So the first thing you need to determine is exactly what type of system you have . If you have a  Hi ,Lo or ERR ( error ) on your screen it says to reset the thermostat with a hair clip somewhere on the t-stat there is a tiny hole . If it still says those error codes to replace the t-stat . Your suppose to leave the HG / HE switch to HG if you have gas if during heating mode only ,your blower fan does not start within one minute then switch it to HE . The HG/HE switch is not affected in cool mode. If you have a 4 wire thermostat and you have one wire hooked to Y1 then according to the install guide you have a Heat Pump system. Replace battery if low . All else fails call Technical support @ 1888.830.1326. But before you call make sure you find out if you have all electric  ( cooling and electric strip heaters ) or electric cooling ,standard A/C and Gas heat or a Heat Pump. When they say electric/ gas they are saying you have gas heat and Central Air

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Joe

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

Experience

Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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