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Honeywell chronotherm IV flashing light on top of thermostat

I have 2 indicators on top of thermostat, the one on the left flashes 4 blips then off, heat pump still works. any ideas

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6 Suggested Answers

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SOURCE: honeywell chronotherm IV Plus thermostat

There are no batteries on an 8600-8601-8602 series

Posted on Sep 19, 2008

  • 252 Answers

SOURCE: Thermostat not functioning correctly

-AC means there is no power coming from the furnace. not a tstat problem

Posted on Oct 04, 2009

  • 308 Answers

SOURCE: my honeywell chronotherm III says -AC any ideas

The problem is your 24v power source. I am unsure as to why you put "other than power source or batteries". If you did indeed check that your thermostat is receiving 24v, then I would say that you have a bad thermostat. Hope this helps

Posted on Jan 23, 2010

  • 577 Answers

SOURCE: how do I program my honeywell chronotherm IV Plus

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 Feb 28, 2010

  • 577 Answers

SOURCE: i have a honeywell chronotherm iv plus thermostat

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 May 10, 2010

SOURCE: I HAVE A HONEYWELL T8600D

pknab, I have the same problem. And it comes down a few things: 1) the flashing 1:00 indicates that you've lost power, and the system needs to be reset. 2) Reset means taking out the batteries for longer than 5 minutes. 3) You have to change your filter monthly. There's one in the cold air return and another one in the furnace. If you don't, your FURNACE may be causing number one (my conjecture). 4) We had an electrical storm 2 days ago--nothing else in the house lost its sense of time...but...well...the online operating manual is difficult to find try http://customer.honeywell.com/techlit/pdf/69-0000s/69-1400.pdf or http://dl.owneriq.net/e/e67c2c91-73c2-4bd8-abc8-91d843a27658.pdf (but it doesn't tell us this stuff...I'm still looking for the meaning of the EEE in the display..perhaps I have repowered the thermostat/furnace in the wrong order).

Posted on Dec 16, 2010

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Chronotherm 4 plus


change the batteries in the thermostat

Mar 21, 2014 | Honeywell Thermostats

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I can't turn my Chronotherm IV plus off! Can anyone help me. It is going to cost a fortune


Depends what model number you have. The older models had problems. So Honeywell upgraded the model several times. When you say, cant turn it off. If that means the heat will not shut off then you have no choice to replace it, also if the heat,cool, off,switch will not work it is not repairable. Go to Home depot or menards and pick up a thermostat. Find somebody with some handy man skills and they can replace it for you.

Nov 28, 2011 | Honeywell Programmable Thermostat Heater

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I HAVE A HONEYWELL T8600D 2028, CHRONOTHERM IV PLUS DELUXE PROGRAMMABLE THERMOSTAT, AND THE TIME/DATE SETTINGS DO NOT HOLD; EVERY MORING, IT FLASHES MONDAY, 1pm. ANY SUGGESTIONS? I RESET TIME/DAY,...


pknab, I have the same problem. And it comes down a few things: 1) the flashing 1:00 indicates that you've lost power, and the system needs to be reset. 2) Reset means taking out the batteries for longer than 5 minutes. 3) You have to change your filter monthly. There's one in the cold air return and another one in the furnace. If you don't, your FURNACE may be causing number one (my conjecture). 4) We had an electrical storm 2 days ago--nothing else in the house lost its sense of time...but...well...the online operating manual is difficult to find try http://customer.honeywell.com/techlit/pdf/69-0000s/69-1400.pdf or http://dl.owneriq.net/e/e67c2c91-73c2-4bd8-abc8-91d843a27658.pdf (but it doesn't tell us this stuff...I'm still looking for the meaning of the EEE in the display..perhaps I have repowered the thermostat/furnace in the wrong order).

Dec 07, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Chronotherm iv fan keeps running even when heat and cool turned off. How do I turn it off?


To turn the fan off, press the "fan key" until it says "auto". This will turn the fan off. When the programs scheduled, changes, the fan will go on again. You have to repeat the fan to "auto" each time the schedule changes.

May 12, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Chronotherm iv fan keeps running even when heat and cool turned off. How do I turn it off?


Assuming you have the fan switch of your thermostat in AUTO, it sounds like a stuck Fan Relay. If the fan relay is stuck, your fan will continue to run as long as there is line voltage being fed to your unit. This relay could be an independent component or it could be an integral part of your control board. Have an experienced, qualified service technician check it out.

Mar 19, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

My home too is stuck at 78 degrees with the Chronotherm IV


a/c will only bring temp down about 15 degrees from outdoor temp

Jun 23, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

My Honeywell chronotherm IV Plus thermostat intermittent problem


The Chrono Therm 3 and 4's were some of the worst products that honeywell has EVER put out. I would suggest switching to the Vision Pro 8000, please consult your local HVAC company for more information regarding the change over.

May 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Chronotherm IV Plus - heat goes off and comes back on


This sounds to me like your thermostat is bad and will need replaced! this is not normal~
Please rate responce,
Thank You!

Jan 07, 2009 | Honeywell Programmable Thermostat Heater

4 Answers

Honeywell cm61 controller


Turn off ‘Optimum Start’
Step 1 Put the thermostat in the OFF position.

Step 2 Press 3 buttons together (at the same time) which are the INFORMATION BUTTON (i) and PROGRAM BUTTONS 3 & 4.
This will show a code of ICL 1 – now let go of the buttons.

Step 3 Press PROGRAM BUTTON 2.
This will now show a code of 30t 1

Step 4 Press the + BUTTON (on the left of the display), tap through until you reach 15 OP 1

Step 5 With the TEMPERATURE DOWN BUTTON; change the 01 to a FLASHING 0. Confirm the FLASHING 0 with the INFORMATION BUTTON ( i ). The 0 will now be static.

Step 6 Put the Thermostat back in the ‘AUTO’ position.
‘OPTIMUM START’ is now switched off.

Dec 23, 2007 | Honeywell Programmable Thermostat Heater

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