OmniStat2 woes

[PilotBMP]

Hello,
I am new to this forum but have learned A LOT just from reading some of your community threads so thank you.
I have an OmniStat2 and I am having some issues with it. I JUST had it replaced by HAI (great customer service by the way). The issue I am having was happening on the tstat I just sent back in. I set my scheduler to change from at 2:45pm from 68 to 72 degrees. However, I noticed today that 3:30 when we were walking out the door that it was reading 69 degrees and no call for heat. Only after I changed the wheel to 73 then back to 72 and ok did the tstat call for heat.
This is the same problem I was having before where the tstat would not make auto calls for heat, only manual and even then, it lets the temp drift too far (2+ degrees) when they advertise +/- .5 degrees. So my thoughts are that the tstats have to be ok, so could it be a short in a wire to the unit (if so, which wire) which doesn't make mouch sense since the tstat makes the calls, not the heat pump. Could it be the firmware has a bug in it that scheduled changes do not take effect (has anyone else had this issue?)

Settings:

• Latest OmniStat2 firmware per HAI
• EEC (Cool 7, Heat 7, Aux heat diff 1 degree/12 minutes)
• Anticipator Cool 3 Heat 3
• Heat pump (1 stage cool/2 stage heat)

Thank you so much in advance and if I missed any details just ask and I will post the answers!

Ben

 

[rsw686]

I installed two RC-2000 thermostats recently and I haven't seen the problem you describe. I have left the EEC and Anticipator at the default settings. Does your thermostat have the black common wire hooked up? I'm wondering if it could be hit or miss with the thermostat having enough power to close the relay contacts.

 

[tmbrown97]

The details you posted don't seem clear (may be formatting on my phone) but things to check are minimum off time; differential settings, etc. For instance, I thought by default it wouldn't kick on till 2 degrees different from the setting. It's very possible it had completed a heat cycle recently enough to still be on minimum off time.

Also if what I saw was correct - 1 degree aux heat differential?

If its a problem with not properly energizing the relays it should still at least show what it's trying to do on the screen.

I would probably default the thing and *only* change the bare minimum settings you need to and only what you fully understand.