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Chronotherm 4 plus

Chronotherm iv plus screen is black. When I hold down the reset button, the screen comes on and the filter light flashes. When I let go of the reset button, the screen goes blank again.

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Change the batteries in the thermostat

Posted on Mar 29, 2014

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AC chronotherm IV plus thermostat has no display and AC has gone off and will not come back on.


Either the 5 amp fuse is blown on the indoor unit, transformer is bad or float switch is tripped.

May 28, 2017 | Amana Heating & Cooling

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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.

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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

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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

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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

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I have a Honeywell Chronotherm IV Plus a/c unit and I can't get my air condt. to turn on. The room temp. says it's 17 degrees in the house so it won't turn on. I need to know how to reset the room tempt....


Not only are the Chronotherm IV's less than user friendly, they have a terrible failure rate. It sounds like one of the typical failures of the chronotherm IV. I suggest starting with a new thermostat.

Jun 12, 2008 | Honeywell Heating & Cooling

3 Answers

Honeywell chronotherm IV Plus thermostat


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

Feb 17, 2008 | Heating & Cooling

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