Question about Honeywell TH9421C1004 VisionPRO IAQ Total Home Comfort System

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How Do I Change battery in Honeywell TH9421C1004 Thermostat

Pulled off wall but didn't see battery, possibly behind front screen?

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

BarrettDenCo
  • 1772 Answers

SOURCE: The wall mounted thermostat in a condominium unit

i think you may have a fan/control board problem, if the thermostat turns on the fan, and you dont touch it, then the fan stops in a short time...
plus the fan is connected to a control board, like i said those thermostats hardly go bad...

Posted on Dec 19, 2010

  • 557 Answers

SOURCE: my heat is ran by

yes it takes batteries

Posted on Oct 23, 2010

  • 767 Answers

SOURCE: I changed the batteries of

Hello my name is Heath it will be my pleasure to assist you. Take the new batteries out and let the display go completely blank then reinstall the new batteries and the lo batt light should go off.

Posted on Nov 08, 2010

  • 13 Answers

SOURCE: I have a honeywell ducted

it more than likely has a battery in it,,,, it can be hard wired and still run off batteries,,,,,,, double check it again,,,,,,,,,,,

Posted on May 11, 2011

  • 16 Answers

SOURCE: Blank Screen on thermostat

check your float switch. On your air hander you have 3/4 white pvc coming out of bottom of unit, where the water drains out. If you have a float and your drain line is plugged it will make your tstat go blank. vacuum the drain line where it comes out of the ground outside.

Posted on Jun 22, 2013

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1 Answer

How do you change the battery on Honeywell Th9421C1004 Thermo


Hello Bob Compher,

It looks like GETTING that battery is the biggest challenge...

After that it simply unplugs (like a portable phone battery).

Your manual is listed (below)

For assistance with this product please visit or call Honeywell Customer Care toll-free at
1-800-468-1502

Homepage

Honeywell VisionPRO IAQ Installation Manual Page 8

Feb 24, 2017 | Honeywell Heating & Cooling

1 Answer

Honeywell thermostat th9421c1004


contact honeywell tech support

Jul 21, 2016 | Heating & Cooling

1 Answer

Honeywell TH9421C1004 blank after power outage. How dove ss I turn it back on?


Remove your thermostat from the wall and you probably will find a battery compartment in the rear.

Sep 01, 2014 | Honeywell TH9421C1004 VisionPRO IAQ Total...

1 Answer

Honeywell TH9421C1004 blank screen after power outage


We'd love to help resolve this. Please give us a call at 1.855.733.5465 and our customer support team will be happy to troubleshoot with you.

Sep 01, 2014 | Honeywell TH9421C1004 VisionPRO IAQ Total...

1 Answer

TH9421C1004 touch screen stopped working


Make sure there is 24 Volts between the R & Common wires connected to the thermostat subbase.

Dec 13, 2013 | 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

How do i reset my honeywell thermostat


Remove thermostat from wall, leaving base plate on wall.
Model number appears on back of device.
Google search thermostat model in following format: Honeywell xxxx32 thermostat .pdf
Adding .pdf to search parameter will yield product manual.
Also while thermostat is off the wall, change batteries located in compartment on back of thermostat. These batteries must be changed periodically, for example each 3-4 years.

Jul 17, 2013 | Honeywell TH3110D1008 Pro3000 Thermostat

1 Answer

Blank Screen on thermostat


check your float switch. On your air hander you have 3/4 white pvc coming out of bottom of unit, where the water drains out. If you have a float and your drain line is plugged it will make your tstat go blank. vacuum the drain line where it comes out of the ground outside.

Jun 19, 2013 | Honeywell TH9421C1004 VisionPRO IAQ Total...

2 Answers

Thermostat


That thermostat must be used with a THM5421C1008 Equipment Interface Module. The thermostat communicates with the module and the module is connected to the HVAC components.

Feb 08, 2008 | Honeywell Electronic Programmable...

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