[Hai-users] Omnistats not talking to Aegis any more

[Ken Schumm]

I'll be the input is fried. I have a fried input on mine caused by a short. 
have a few spare inputs so it's not a big deal here but for the thermostat 
input it probably needs a board repair.

Unless someone else comes up with a better idea.

Ken

----- Original Message ----- 
From: "Eric Rosenquist" <rosenquist at gmail.com>
To: "HAI Users Mailing List" <hai-users at tssi.com>
Sent: Thursday, November 29, 2007 4:09 PM
Subject: [Hai-users] Omnistats not talking to Aegis any more


> As of a few months ago, my 3 Omnistats are no longer talking to my Aegis 
> (=
> Omni Pro) controller.
>
> We had a couple of brownouts a few months ago and I thought maybe a power
> glitch was the reason, but a reset of the Aegis RAM didn't make any
> difference, so I took a look at the main thermostat. When I popped the 
> cover
> off I was a little miffed to find that a mouse had chewed some of the 
> Aegis
> communication wires but not the heavier HVAC ones. They were chewed enough
> to expose some of the metal strands and quite possibly cause a short. I
> snipped the wires off below the chewed portion and reconnected everything. 
> I
> figured that my problem was solved, but I still can't get the thermostats 
> to
> talk to the Aegis.
>
> Here's what I've tried so far:
>
> * Verified that the wiring to all 3 is good. I even tested the red wire to
> make sure it was properly connected to the black at each thermostat. The
> tests tell me that I don't have any breaks in the wiring to the 
> thermostats
> nor any crossed wires.
>
> * Took my thermostats over to a neighbour's house and plugged them in,
> replacing one of his Omnistats. Both of the units I took over (the 3rd was
> running the furnace at the time) got the time of day from the Aegis very
> quickly and were therefore able to talk to his controller. This tells me
> that the problem is not the thermostats.
>
> * Disconnected all 3 thermostats and then connected each of them so that
> they were the only one connected and powered up. I waited 10-15 minutes
> after connecting each time but it didn't make any difference. I also tried
> connecting one directly to the controller using a new wire, eliminating 
> the
> other t-stats and the existing wiring. No difference.
>
> * Checked that all of the t-stats have unique IDs and are set for "system"
> communication mode.
>
> * Changed all thermostat types to "not used" and then back to heat/cool 
> just
> to ensure that the Aegis knows I have thermostats and sets zone 16 and
> output 8 for thermostat communication.
>
> * Reset the Aegis RAM and then reloaded all of the programming.
>
> * Disconnected the AC and battery power to the main Aegis board, waited 20
> minutes, then reconnected power & battery.
>
> * Changed all thermostat types to "not used" to see if zone 16 and output 
> 8
> were working. With Z16 open I get a reading of about 252. With a resistor
> across it I get 146 or 147. With it shorted I get about 127. The odd thing
> is that I can't get Output 8 to go back to being a regular 12V output. 
> Even
> with the thermostats not configured I always read around 2.6VDC on output 
> 8
> regardless of whether it's ON or OFF. Is there some other setting that
> controls the mode of output 8? The other outputs read a little over 12VDC
> when ON and next to nothing when OFF as expected.
>
> Suggestions/ideas are welcome!
>
> Eric
>
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