Question about Honeywell TH9421C1004 VisionPRO IAQ Total Home Comfort System

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Honeywell TH9421C1004 not available only wifi is it compatible

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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

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

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

Honeywell Instruction Manuals


The power on many of those units is derived from the unit itself. Check the control fuse on your furnace, or check the breaker, or switch, or other power source to the unit. But remember, there is a problem. Be very careful or you know what you are doing or you could burn your house down or hurt somebody.

Nov 02, 2013 | Heating & Cooling

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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