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My display light on my T725 IAQ thermostat just started staying on all the time. It hasn't been doing that. Can you tell me why this has happened?

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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mercadoarvin
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SOURCE: honeywell thermostat VisionPro IAQ flashing

Welcome to Fixya.

This error code implies "heating or cooling equipment missing"- on easier terms, something might be disconnected or incomplete as you may not have everything hooked up. If so, you need to go to the installer menu to make sure you have the correct settings.

Here's a user's manual just in case :

VisionPro User's manual

Thanks for using Fixya.

Posted on Jun 04, 2011

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I have a Honeywell VisionPRO IAQ thermostat. Heat won't kick on automatically, thermostat keeps saying 'wait. Can turn system off, back on and works. Is there something I can do to fix it?


Have you tried reseting the system by throwing the breaker waiting a minute then restarting? Turning it off and on at the keypad isn't the same thing. That has happened to me and the program glitched. I'm not sure what is being displayed on the screen, so am not sure what you have done, partially completed a scheduling program, etc. However, I found the manual online.
www.manualslib.com/manual/782319/Honeywell-Visionpro-Iaq.html?page=2#manual
You can look through it and see if there is something in there you aren't/are doing to keep it from working properly. There is also a 1800 number for assistance from Honeywell if your still stuck. Hope this helps.

Oct 18, 2017 | Honeywell Heating & Cooling

1 Answer

Auto does not show in system


On Honeywell thermostats you have to program the thermostat on the setup mode to have the auto to be on the display. The setup instructions will walk up through it. If you do not have them, you can down load them to you computer.

Jul 20, 2014 | Honeywell TH9421C1004 VisionPRO IAQ Total...

1 Answer

Touch screen stopped responding


Pull the thermostat face off the wall. Wait a few minutes, & gently line up the pins and place back on. Let display pull up. If that doesn't work, your thermostat is probably under warranty...Replace.

Dec 13, 2013 | Honeywell TH9421C1004 VisionPRO IAQ Total...

1 Answer

Honeywell VisionPRO IAQ thermostat. No back light. Screen shows characters, but dim. When touched, back light fails to work. All other systems function okay.


this control has an option for back light display in the set up menu. if it has never worked this may be the problem. if it did work then quit you should replace the t-stat. there are many different models as they have advanced over the years. this is a great control. see if you can find the set up manual

Oct 12, 2013 | Honeywell YTH9421C1002 VisionPRO IAQ...

1 Answer

The furnace comes on @ 70* when programmed to be 60* at night


you have to switch it to settings and reprogram it. find your owners manual and it will tell you how to program your thermostat

Dec 01, 2012 | Honeywell Programmable Thermostat Heater

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