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50039990-003 A
© 2009 Honeywell International Inc.
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 International Inc.
Honeywell Control Systems Ltd.
Arlington Business Park,
Bracknell, Berkshire
RG12 1EB
Technical Help Desk: 08457 678999
www.honeywelluk.com
Hereby, Honeywell declares that this CM727/CM721 room thermostat and BDR91 Relay Box are in
compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC, 2006/95/EC
and 2004/108/EC.
®
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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

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    • 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

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