Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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The word return on the thermosts

The word return just appeared on the screen of our thermostat. What does it mean and how can I get it to go away?

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It is part of the 7 day timeclock function, you should be able to take the timeclock program out of your settings and it wont come up again

Posted on Jun 16, 2009


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AC OFF code keeps coming on. Is this the thermostat or a more expensive problem

If you are seeing this AC code on your thermostat screen that usually means that the thermostat is losing power. If a furnace is overheating the limit switch will shut the burner off cutting power to the thermostat. Check your air filter and make sure all your supply and return registers are open.;

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What does it mean for return on my thermostat

Hey Patti, the "return" is where the air filter is located..its the entire path of clean air from the filter to the blower..

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Ritetemp 8022c

After you program the thermostat..the temperature numbers stays on the screen a few seconds then starts to indicate the temperature of the room. This is normal.

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Ge dryer dde5808mdlw shuts off no heat

This is an older model. When you say it shuts off and no heat does that mean after it runs for a while or it shuts off right away. Since it appears to be an older model many things can cause no heat. Bad heater. Also burnt wire to thermostats located behind an aluminum cover inside where the lint screen goes.These are hard repairs and expensive. If you are real handy maybe you could do the burn wire repair which also requires a new thermostat as you will see if the wires are burnt in this location.To take cover off you may need a torx wrench, been a while and i forget weather its a philips head or torx. The first test is to see if you have 220 volts at the heating element. All this requires a very skilled person.

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What does FR Return mean when thermostat says this?

it means that it is friday and your "return home" program is running. there isn't actually a "FR Return" alert, it just lines up that way because the day of the week line sits directly above the program line.

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1 Answer

Beeping noise

E2 means hot water over shot, make sure to check boiler hot water system to make sure zone valve or control is staying closed when the call for boiler hot water to the water heater is isolated. Sometimes a zone valve will fail open or not close properly causing hot boiler water to constantly feed the water heater.

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Black Square

Turn Off the CC Caption inside the Setup Menu.

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Thin bright red vertical line from top to bottom of screen

that is the screen burned out. if still have a warranty return to company and get a return/exchange.

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Black on lower half of screen

This type of problems and some OSD problems are occurs due to microprocessor over modulation. One option is there. That is if you have any child lock or keypad lock or frontpanel lock. First locked the system. Now check your problem arise. If it is not OK. Otherwise try to find nearby any radio frequency cable across in your tv. keep away that cablewire also. your problem solved. Even you get Call your nearst service provider..

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