Question about Honeywell Programmable Thermostat Heater

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Honeywell CM901 - i want to change my thermostat like for like - is it as easy as just replacing and wiring the wires in the same as before?? am i right in saying there is no electricity supply to the thermostat its just wired direct to the boiler??

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In some cases yes and Depending on the thermostat some have a 24v power feed. If you have a basic heat only you should only have two wires ( Red White ) unless some one did a home job where the color code is not right.

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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Honeywell RTH7500D Thermostat


This Honeywell thermostat is a good medium priced thermostat that will give you many bells and whistles at a very good price. The programming is very easy to do and of course the thermostat is very reliable also.

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The installation of this thermostat is very easy and if you need help with the installation you can go here to see the complete installation guide.

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2221ES.pdf

If you have lost your owners manual and need a copy of it you can go here

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2222ES.pdf

With the help of these .pdf files you can get all the information that you need to install and troubleshoot your RTH7500D thermostat.
If you are replacing a thermostat make sure that you turn off power to your heating or air conditioning system BEFORE you start removing any wires. Failure to do so could cause you to burn out the 24v transformer of your system. Also make sure to mark all wires well before removal so that you know which wire went where and so that you can reinstall the old thermostat as it was if something goes wrong with the new installation.

For heat pump systems you WILL have to make some programming changes to the thermostat to get it to work with a heat pump system. Most all thermostats come programmed for conventional systems. This reprogramming is not difficult but is required for proper operation.

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3892721-programmable_honeywell

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

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