If your home heating/cooling system is not functioning properly and the problem is not with the system then it must be the stat. That is unlikely unless it has been smacked with something and damaged. Would need some more info such as symptoms and why you suspect the stat to be of more help.
if its not working.
rite temp thermostat model # 8030
It sound like the thermostat is broken
If the thermostat is broken in the closed position the engine would overheat rapidly. If it was broken in the open position the engine cooling system would not reach normal operating temperature and the heater would produce only warm air. Take the thermostat out and put it in a pan of water on the stove. When the water gets to around 200 deg F, the thermostat should open. If it doesn't it needs replaced. Observe carefully that you have not installed the thermostat upsidedown.
if the indicator light is not getting switched off or on
it should be replaced when it stops doing its job controlling the temperature and replacing the battery does not solve the problem or it is showing a digital error code that tells you it is defective. You may also want to test if it actually is doing its job but the heating or cooling unit may be broken. If you have more than one zone and you know what you are doing, you can switch it with a known working thermostat and see if the problem stays with the zone or it moves with the thermostat. That should tell you if the thermostat is broken or the system related to that zone needs maintenance.
you will know your thermostat is broken on your 94 celica because the engine temp will never raise and the engine fan will run continuously. I have a 92 and my thermostat is at the bottom of the engine, hard to get to because it's close to the left quarterpannel. I'd get a chilton's or some other repair manual, it will help you out tremendously. -J
Broken thermostat. Common Chrysler problem. Replace the thermostat.
Your thermostat is broken
It's complicated to answer that question.
When it's broken or the mercury stays the same.
replace it