[Hai-users] tstat power reset

[Joseph Vossen]

All five (5) wires (Red, Green, Yellow, White and Blue) are connected.  I get a constant 27VAC between the Blue (C) wire and the Red (R) wire.

This tstat is connected to a zone control board with 2 other tstats; the other 2 tstats see 27VAC between Blue (C) and Red (R).

System has been installed around 12 years and never had a 30A00-2 power supply module.  I have 2 other systems in the house, each wired with the same zone controller and each of those have 3 tstats (3 systems, each with 3 tstats for a total of 9 tstats/zones).  All of those also show 27VAC between Blue (C) and Red (R).

I'll move the tstat to another location and see if it follows.

any other ideas?

just curious; does anyone have any NIB rc80 tstats laying around?

thanks

On Dec 9, 2009, at 10:18 AM, Dudoussat, Scott A. wrote:

> Do you have a common wire from the HVAC transformer connected to the "C" terminal of the RC-80?  If not, you may need to connect one.  If the wire isn't there and it's not feasible to run one, you can connect the HAI 30A00-2 Thermostat Power Supply Module to the HVAC system to remedy the issue.
> 
> Scott
> 
> -----Original Message-----
> From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On Behalf Of Joseph Vossen
> Sent: Wednesday, December 09, 2009 4:07 AM
> To: hai-users
> Subject: [Hai-users] tstat power reset
> 
> I have a RC80 tstat that appears to randomly go through what looks like a power reset (the display "blanks" out followed by every line of text displayed on the LCD).  By random, it may occur several times a day or once a week.
> 
> this tstat has been installed going on 12 years and has never given me a problem before.  Wiring to both the panel and the HVAC equipment are fine.
> 
> tstat going bad?
> 
> thanks