I am new to a heat pump. The thermostat has an 'auto' setting and an 'on' setting. I am confused as to which one to use for heat. Can you help me?

If the fan does not turn on when set in auto and system to heat you likely do not have the thermostat set up properly. In settings be sure to set up heat pump with backup electric heat. Then the tstat brings fan in not equipment

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If your thermostat is being used with an electric heating system and the fan does not start in heating mode on auto; remove the thermostat from the subcase on the wall and check for a switch on the back of the thermostat. A lot of electronic thermostats have a switch on the back that says electric/heat pump and gas/oil. If you have electric heat or heat pump you need to switch it to this side. Usually this is set at the factory for gas/ oil. Gas/oil furnaces have built in means of bringing on the fan and electric/ heat pumps are brought on by the thermostat.

the black wire is your common wire, you need to program your thermostat, in the advance mode, to tell the t-stat if your heat pump reversing valve is energized on cooling or heating, is the orange wire connected to your t-stat.= w2/o/b

You need a 2 heat, 1 cool, heat-pump thermostat. W2 is the heat from the heat-pump unit outside, E is the emergency heat inside the house (usually electric), and on the new thermostat you just have the one W terminal for heat. You can jumper the two wires together (W2 and E from the old thermostat), but you will get both heats all the time when its being called for. Since you may have powered heating instead of powered cooling, I would try to get a thermostat that matches up better, otherwise, you might run into more problems than just the terminals, like rewiring the heat pump and furnace/air handler to accommodate the new thermostat. Hope this helps, and if you still have problems afterward, be sure to explain which wires were already hooked up to which terminals and so forth so we can have a little better idea whats going on, sometimes it can get confusing without being there. Good luck and hope everything works out for you!

this may be a problem with the outdoor unit have you tried a new thermostat? but if this does not solve it check the settings

Hummm... how far is your Thermostat from your heater? I am reading your extensive manual but there is no mention of that distance? There was a early mention of batteries? Are yours fresh?

Is this a 'new' problem? Has it worked properly before?

Then there is this from the manual:

The installer can set SYSTEM functions once the thermostat is installed. The
default settings are shown in bold in the following list. Options are listed inside the
parentheses. Example: the default SYSTEM TYPE is CONVENTIONAL with (HEAT PUMP) as a second option. See pages 28-29 to change these settings.

Have you tried resetting your Thermostat?? Sometimes these basic 'onboard' computers get confused... especially true with lots of 'options'...

It's a little hassle to get a DIGITAL copy of your manual (I am not a Robot ~ etc) ~ but here it is:

Download manual

TROUBLESHOOTING begins at Page 68

Anthony

I think you probably have a heat pump. Aux heat is electrical resistance heat coils that produce heat when the heat pump can not produce enough to keep the temperature up (caused by low outside temperature or a problem with the refrigerant system). This resistance heat can be switched on by the emerg. heat button. It also can come on automaticlly (sp) and will be indicated by the aux being shown on the thermostat. Sometime if you set the heat up several degrees by thermostat the aux will come on to help the system catch up to the desired temperature setting. The emerg. heat is a way to turn on the AUX manually. If you do not have a heat pump system then it is possible that you have a heat pump thermostat installed on a non heat pump system. Emergency heat and Aux are both the secondary.

Hope this makes sense1

Bob

You have the stat programmed incorrectly or wired incorrectly there are alot of settings for installers in that stat and all of them have to be set correctly

It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.

I am trying change from a Honeywell ct701A1001 to Hunter 44110 the old one has 7 wire and new one 5wires