Check package contents:
Before you begin, make sure you have:
TURN OFF POWER at heating/cooling system (or fuse/circuit-breaker panel).
Remove cover and thermostat, but leave wallplate with wires attached.
MERCURY NOTICE
If your old thermostat contains mercury, contact your local waste management authority for proper disposal instructions.
Use a screwdriver to disconnect wires one by one. As you disconnect each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.)
Remove the old wallplate only after all wires are labeled. Be careful not to let loose wires fall into the wall opening.
Labels don’t match?
If labels do not match the letters on the thermostat, see the table below.
Connect to
Existing wires CT30/CT33 CT31
R • RH • 5 • V | Terminal “R” | Terminal “R” |
W • W1 • H | Terminal “W” | Terminal “W” |
Y • Y1 • M | [1] | Terminal “Y” |
G • F | [1] | Terminal “G” |
Rc | [1] | [1] |
[1] If this wire is present, you may have purchased the wrong thermostat. Call 1-800-468-1502 for help. M29584
CT33 model is for 750 MV heat only
Your system Setting
Gas or oil furnace (less than 90% efficiency) 0.4
Electric furnace (any type) 0.3
High efficiency furnace (more than 90% efficiency) 0.8
Hot water system 0.8
Gas/oil steam or gravity system 1.2
System off (select models)
Move lever to far left to turn off heating system.
Temperature setting
Adjust to set desired indoor temperature.
Fan switch (CT31)
Auto: Fan runs only when heating or cooling system is on.
On: Fan runs continuously.
System switch (CT31)
Cool: Controls the cooling system.
Heat: Controls the heating system.
Off: All systems are off.
CAUTION: EQUIPMENT DAMAGE HAZARD (CT31).
Do not operate cooling system when outdoor temperature is below 50°F (10°C).
Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for a period of one (1) year from the date of first purchase by the original purchaser. If at any time during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo’s option).
If the product is defective,
This warranty does not cover removal or reinstallation costs.
This warranty shall not apply if it is shown by Resideo that the defect was caused by damage which occurred while the product was in the possession of a consumer.
Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above. RESIDEO SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.
Need Help?
For assistance with this product please visit honeywellhome.com
or call Resideo Customer Care toll-free at 1-800-468-1502
Download Manual:
Honeywell CT30 Series Low-Voltage Thermostat Owner’s Manual
Honeywell Home CT30 Series Low-Voltage Thermostat Owner’s Manual
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