Temperature in Room too High- Thermostat Issue?

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This is a new thermostat (White-Rodgers) which replaced a Honeywell. Both are digital. The Honeywell was replaced because of this problem, and the same conditions occur with the new one, so rule out the thermostat. I will follow your suggestions. Thanks.
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Thank you all for your time and expertise helping me with this. I will employ your ideas this weekend and have more data to report. I hope some of the simpler possible causes exist, otherwise the service guy will have to get called, and given the more complicated possibilities, that really worries me!!!!
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The challenge is to be there at the moment when the problem occurs, and then to find the problem.
Sticking relay, and thermostat wire insullation rubbed through sound like good places to start.
Christopher A. Young Learn more about Jesus www.lds.org .
Thank you all for your time and expertise helping me with this. I will employ your ideas this weekend and have more data to report. I hope some of the simpler possible causes exist, otherwise the service guy will have to get called, and given the more complicated possibilities, that really worries me!!!!
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Yes, this does seem intermittent. When she got home from work tonight she said everything was fine.
On Tue, 3 Apr 2012 19:32:02 -0400, "Stormin Mormon"

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On 4/2/2012 10:31 PM, frank1492 wrote:

From your description, it sounds like a very basic hydronic system with a domestic hot water coil. The only parts of that system that could cause overheating would be a faulty thermostat, which was pretty much ruled out, possible sticking circulator relay, although doubtful, an intermittent shunt on the thermostat cable. If it's a very old cloth wrapped cable with cloth wrapped conductors, this is a pretty good possibility. The last possibility would be an open flow check valve. Crank the valve closed, then open it one turn.
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Sticky relay and open flow check are high on my list! (The thermostat wire is plastic coated.)

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