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Honeywell helpline My CT3400 low bat indicator came on, all other functions are off. I replaced the batteries with AA Alkalyine and that worked for a few min. then when off. I would like to try a new thermostat unit but can not find a CT3400. Can you help?

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

ACTECH
  • 80 Answers

SOURCE: Replaced thermostat on FA4ANF030 with Honeywell model rth3100c does not work

if you have a newer t-stat your heat pump reversing valve is either o or b depending on the type of system you have

Posted on Dec 19, 2007

  • 1 Answer

SOURCE: I have a Honeywell T8131C

I tried all the tricks mentioned previously to no avail.

These are the steps I performed to get it to work:

1. Remove batteries and make sure the battery contacts inside the unit are clean.

2. Disconnect all the wires from the back of the unit. Be careful not let any of the bare wire ends to come in contact with each other. Make sure you mark the wires or verify that the color code matches the markings on the rear cover:
W=White wire;
Y=Yellow wire;
G=Green wire;
R=Red wire (low voltage DC); and
C=Common (wire color varies)

3. Leave the unit disconnected with batteries removed for about an hour to make sure all the memory drains. I waited an hour, but it may not require that much time.

4. Install the batteries in the correct positions per the instructions. The unit should perform a power up display test, then the display will flash the time and temperature.

5. Set the clock and the display will stop flashing.

6. Slide the switch to cool and/or heat and program the desired weekday/weekend settings.

7. Slide the switch back to off once all weekday/weekend settings are made.

8. Reconnect the wires that were removed in step 2.

9. System should be operational at this time.

Posted on Apr 22, 2009

  • 340 Answers

SOURCE: wiring in a new thermostat

yes .common as in the netural side of the transformer x to cif not hooked up the stat will still work. and honeywell has good support for their products . Tom

Posted on Jun 21, 2009

  • 1 Answer

SOURCE: Screen says bat low

Found the manual online and it said to put the batteries in backwards for at least 5 seconds to re-set the thermostat. Amazingly, this worked.

Posted on Oct 02, 2009

Testimonial: "cool"

  • 587 Answers

SOURCE: We just replaced the batteries in our Honeywell

HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Posted on Jun 07, 2010

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http://safemanuals.com/314159.php?k=af5d595162dd03d6ac627239ba1fbecf&ID=530143&q=HONEYWELL%20T8132A

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HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

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Found the manual online and it said to put the batteries in backwards for at least 5 seconds to re-set the thermostat. Amazingly, this worked.

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This worked! Thank you! It was 49 degrees in the house, and now the heater is working again.

Thank you and warm wished for the new year!
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