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Honeywell CM901 Room Thermostat

Product Code: 39124

Electronic sensing element. 3-wire installation. Override facility. Holiday mode. Automatic BST/GMT time change.

  • Digital Display
  • 6 On/Off Periods per Day
  • 1 Pre-Set Programme
  • 24 Hour Programmable
  • 3 Wire Installation
  • Frost Protection
  • ERP Control Class: IV
  • View more information

Switch/contact rating: volt free (switches 24-230V). Temperature range: 5-30°C. H x W x D: 89 x 133 x 26mm. 2 x AA batteries supplied.

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Honeywell CM901 Room Thermostat Instruction Manual



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Rated 3 out of 5 by Digits fail Had this for 2 years and now half the digits have failed. Can't tell the difference between a 7 8 or 9. Reliability very poor score. 6 Oct 2013
Rated 5 out of 5 by Excellent Product I installed one of these at home and working great. The TPI control "ramps" down the boiler time as the temperature gets close to set point. Less overshoot and a more stable house temeperature. Night setback and holiday mode are good. I am about to fit these and the DT90E to some fan convectors at work with old 2-wire thermostats with wide overshoot / undershoot of temperatures. Best feature of all for a School enviorment is being able to set the Max / Min adjustments within the installer mode which should prevent the unauthorised adjustment of the settings. Scewfix should consider stocking the CM907 unit as well for anyone wanting a 7 day version. 16 Oct 2011
Rated 5 out of 5 by Excellent Product Easy to install and programme. The unit replaces both time clock and room thermostat. The literature specifies 6 on/off periods per day which is not strictly correct. It is always controlling. Target temperatures are user programmed for the whole day and after the target temperature is reached it is maintained very precisely. In manual a target temperature is user programmed and in the off position a frost protection is temperature can be set. 29 Nov 2010
Rated 5 out of 5 by Great Product Easy to install with a good range of features and a backlit screen, makes it easy to read in darker areas. 21 Dec 2009
  • 2015-11-25 T09:44:37.200-06:00
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Download more info (pdf)

Brand Honeywell
Display Type Digital Display
Installation Type 3-Wire Installation
Manufacturing Standards Building Regs Compliant,
Model No CM901
Pack Size 1
Product Depth 26 mm
Product Height 89 mm
Product Type Room Thermostat
Product Width 133 mm
Programme Facility 24 Hour Programmable
Temperature Range 5-30 °C
Total Product Weight 0.21 kg