Hello,

I just posted this same question but it was as a reply to a similar problem. I didn't think I'd get any answers so I've decided to repost here as a question of my own.

I'm new to this site so please forgive any ignorance. I have virtually the same problem as Snazzy (post: thermostat resets randomly)

I, too, purchased the same Noma prog. Tstat (Model THM303M or Canadian Tire code: 52-2558-8) and it is randomly resetting itself. I originally purchased it back in June and all summer it was working just fine with the A/C. Ever since switching over to heat it has been randomly resetting itself. I exchanged it for the exact model earlier this week and now I'm experiencing the same problems. In the summer we had an HVAC technician come check out our system because the A/C wouldn't come on. He tested all the wires and his conclusion was that our tstat was garbage and we needed a new one. That's when I bought the Noma.

I realize that most tstats have the typical setup for wiring (W, Y, G, RC, RH, etc.) but what about the wiring in the house. The colours don't exactly match. I have a:

White wire attached to W
Orange wire attached to Y
Green wire attached to G
Black wire attached to RH
Red wire attached to RC

Does that make sense? Are there any problems with that setup that would contribute to my current problem?

The furnace comes on and it heats the house fine... the problem is the resetting. The default setting for Sleep (10pm - 6am) is 17.5 C or 63 F which is really cold!! My wife and I could suck it up but we have a 2 year old who has woken up with purple lips because the system resets in the middle of the night sometimes and we're totally unaware.

Any and all help would be greatly appreciated. Hopefully I've given enough information.
Thanks so much for taking the time to read this.
Brad.

Noma thermostats are junk in my informed opinion. To many problems. Buy a Honeywell or White Rodgers to cure the problem. FYI the wiring as posted looks good.

Hello,

I just posted this same question but it was as a reply to a similar problem. I didn't think I'd get any answers so I've decided to repost here as a question of my own.

I'm new to this site so please forgive any ignorance. I have virtually the exact same problem as Snazzy (post: thermostat resets randomly)

I, too, purchased the exact same Noma prog. tstat (Model THM303M or Canadian Tire code: 52-2558-8) and it is randomly resetting itself. I originally purchased it back in June and all summer it was working just fine with the A/C. Ever since switching over to heat it has been randomly resetting itself. I exchanged it for the exact model earlier this week and now I'm experiencing the same problems. In the summer we had an HVAC technician come check out our system because the A/C wouldn't come on. He tested all the wires and his conclusion was that our tstat was garbage and we needed a new one. That's when I bought the Noma.

I realize that most tstats have the typical setup for wiring (W, Y, G, RC, RH, etc.) but what about the wiring in the house. The colours don't exactly match. I have a:

White wire attached to W
Orange wire attached to Y
Green wire attached to G
Black wire attached to RH
Red wire attached to RC

Does that make sense? Are there any problems with that setup that would contribute to my current problem?

The furnace comes on and it heats the house fine... the problem is the resetting. The default setting for Sleep (10pm - 6am) is 17.5 C or 63 F which is really cold!!! My wife and I could suck it up but we have a 2 year old who has woken up with purple lips because the system resets in the middle of the night sometimes and we're totally unaware.

Any and all help would be greatly appreciated. Hopefully I've given enough information.
Thanks so much for taking the time to read this.
Brad.
Thanks hvac1000. I was starting to think that same thing myself. I was surprised to see so many other people on here having problems with Noma t-stats. The supervisor of the hardware dept. at Cdn. Tire said that they sell thousands of those Noma t-stats and rarely have a problem... I wonder where he's getting his stats from!?

Cheers.
Brad.

Hey Brad,. what did you end up doing? I have installed the same ts for my in laws. Had the same problem, went back and exchanges it for another one, and still have the same problem... ANY IDEAS? Is it this model that is defected? Cnd Tire has been having it on sale for $29.99... maybe that is why!!