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Honeywell 24 Hour 2 Channel Timer ST9400A

Item Code: ST9400A1002


Quick Overview

The Honeywell ST9400A provides timing control for both your central heating and hot water systems, letting you set ON and OFF periods to suit your own lifestyle. The ST9400A does not directly control the temperature but works together with other temperature controls, such as room thermostats and cylinder thermostats, to control your heating and hot water system in your home. ST9400A has 1-day programming and 2 on/off periods per day. It is simple to use but still allows heating and hot water to be set at different times from each other. The following instructions explain how to programme and use the ST9400A to provide the most home comfort at the least cost.


ST9400A is a 2 channel programmer, designed for control of both heating and stored hot water in complete systems. The heating and hot water programmes are completely independent, to allow the system to be operated in the most energy efficient manner possible. The unit is a 1 day full programmer with two on/off switching times per day (which can be increased to 3). It can be used for combi boilers, heating zones or any application where small electric loads need switching.

ST9400A can also be set as a mini programmer for older gravity circulation stored hot water systems, where there is no interlocking control valve. All ST9400 models incorporate the Line of Text (LoT) display that gives clear plain English instructions whenever any button or slider is used. This means that installers, customers and users can operate all of the controls reliably, without needing to find an instruction manual. The ST9400A complies fully with Building Regulations Part L1 for England & Wales and Part J for Scotland. This model has superceded the ST6400A. 


  • LoT display, providing text feedback that gives help and programming hints
  • Large backlit display
  • Factory set clock and date
  • Automatic Summer/Winter 1 hour time change
  • Temporary or permanent override facilities
  • Extra hour facility, for up to 3 hours boost or programme extension
  • Choice of 3 different built in programmes
  • Programme indicator lights
  • Fits on industry standard back plate
  • Direct replacement for ST6400 models
  • Any programmed settings retained indefinitely in non volatile memory
  • Up to 3 on/off times per day


Connection Wired
Power Supply 240V
Operation Programmable
Functionality Timer
Channels 2 channels


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This product appears in the following categories:  Timers

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