subterFUSE Posted July 30, 2015 Share Posted July 30, 2015 I have an new C4 themostat (Aprilaire) and an old Control4 thermostat which I have just hooked up in our new home. Unfortunately, neither T-Stat is working properly with my HVAC system. I have a fairly good idea for what the problem is on the new T-Stat, but I'm not sure why the old one is not working. The new April Aire T-Stat has been programmed incorrectly. It is set for Heat/Cool when it should be set for Heat Pump, with "O" energized on cooling.I went into the Installer Setup settings and tried to change those 2 settings, but those options are locked out. I can change almost every other setting but those two are locked. I feel optimistic that if I can change those 2 settings on the Aprilaire thermostat it should work properly. But I'm not sure why I can't change those settings. I also cannot reset to factory defaults. As for the old C4 T-Stat, I'm not sure what is wrong. I connected everything exactly as it should be for Heat Pump (2 stage heat, 1 stage cool). The internal switches are all correct. Heat Pump, Electric, Electric, Power Steal Disabled since I have Common. My system uses O for Reversing Valve cooling, so I'm using the O port on the T-Stat. The problem is that when the system runs with this T-Stat, it's running the heat when it should be cooling. This causes the outside unit to shut off after about a minute. The air handler just blows air for a few minutes, but then it shuts off, too. I wired up the old "dumb" thermostats last night and got my A/C working again so we could sleep in comfort. The one difference I noticed on the dumb thermostat vs. the Control4 T-Stat is that the dumb thermostat has 1 port labelled "O/B" whereas the C4 T-Stat has separate O and B ports. My HVAC installer insists that my system is energized on O for cooling. But maybe I should try the wire on the B port on the C4 thermostat? Any advice appreciated. Link to comment Share on other sites More sharing options...
Matt Lowe Posted July 30, 2015 Share Posted July 30, 2015 you can confirm your system is energized on o for cooling by putting the o wire on the RC terminal this will give a +12 and if your system starts to cool then you will know for sure. Link to comment Share on other sites More sharing options...
subterFUSE Posted July 31, 2015 Author Share Posted July 31, 2015 There was a Heat Pump switch on the back of the new Aprilaire thermostat. Derp!!! Link to comment Share on other sites More sharing options...
Matt Lowe Posted July 31, 2015 Share Posted July 31, 2015 i neglected to suggest that as i thought it was a given ha! Link to comment Share on other sites More sharing options...
funnyfarm299 Posted August 8, 2015 Share Posted August 8, 2015 Even I occasionally forget to do the heat pump switch occasionally. Did four thermostats last week, was scratching my head trying to figure out why one zone wouldn't cool. Link to comment Share on other sites More sharing options...
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