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Honeywell CM727 Manual

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How do I change the batteries on the
thermostat when they run out?
The thermostat constantly monitors the battery
power level, which typically lasts for about 2
yearsbeforeneedingreplaced.Whenthepower
is running low a ashing symbol will be
displayedonthescreen.Tochangethebatteries
followthe stepsin theabovesection(‘STEP 1:
Installing the Batteries
’ onpage3), replacing
the used batteries with new ones in Step c.
Note:Whilechangingthebatteriesyourprogram
settingswillbestoredbutyoumayneedtoadjust
thetimesettingstobecorrect.
How do I set one temperature for the
whole day?
To operate as a simple thermostat with one
temperature throughout the day, select the
manual operating mode by pressing the
MAN button. Adjust the temperature by
pressingthe or buttons- thiscan be
setanywherefrom5°Cto35°Cin0.5°Csteps.
The thermostat will continue to maintain this
temperature until another operating mode is
selectedorthetemperatureisadjusted.
FAQ’s
BDR91 Relay Box Controls Layout
The relay box will normally be found mounted
close to the boiler.
What does it mean when the BDR91
relay box green LED is ON?
The green LED indicates normal operation of
the radio frequency system. When the green
LED is ON the boiler is also ON. When the LED
is OFF the boiler is OFF.
When do I need to use the push
button?
You should use the push button to control your
boiler only when the RF communication is lost
(see the Troubleshooting Guide).
Push button
and relay
status LED’s
This product and its associated documentation and packaging are protected by various
intellectual property rights belonging to Honeywell Inc. and its subsidiaries and existing under
the laws of the UK and other countries. These intellectual and property rights may include patent
applications, registered designs, unregistered designs, registered trade marks, unregistered
trade marks and copyrights.
Honeywell reserves the right to modify this document, product and functionality without notice.
This document replaces any previously issued instructions and is only applicable to the
product(s) described.
This product has been designed for applications as described within this document. For use
outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be
held responsible for misapplication of the product(s) described within this document.
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell
Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised
Representative Honeywell Inc.
… 14


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  • My heating is not coming on when I set it to the manual button Submitted on 26-5-2023 at 15:50

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    • It may be because the room temperature is already at temp. Try turning the temp up and see if it fires. Answered on 27-5-2023 at 08:53

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  • When I set my thermostat to manual the heating doesn’t come on, where am I going wrong. Thank you Submitted on 26-5-2023 at 15:49

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  • We’re going away for 4 weeks soon , I’ve set the Thermos on Auto to come on twice a day for an hour to prevent any freezing in the pipes- will the thermos still come on automatically between the set times if the temp drops below a certain level? In other words, will our heating be on full time when we’re away during a cold snap? Obviously this is going to incur high charges for us .Any advice appreciated Submitted on 12-12-2022 at 06:43

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  • Hi I have a CM721 and CM727 Honeywell Thermostat.
    I cannot manage to keep the temperature to remain constant, IE At night I sometimes need 23 C to stay warm during the night ( otherwise I get cramp! )
    Which button/s do I press and in which sequence please ?
    Many Thanks,

    Alan
    Submitted on 15-11-2021 at 12:31

    Reply Report abuse

    • You’d have to leave the thermostat on manual and adjust the temperature with the up and down arrow buttons to the right hand side of the screen Answered on 15-11-2021 at 12:33

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  • Why does the heating come on outside of the times I have set it to come on, when in auto mode? Submitted on 3-11-2021 at 08:16

    Reply Report abuse


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