Honeywell ST9400C Programmer Product Code: 88608

Separate timing. 2-wire installation. Override facility. Holiday mode. Automatic BST/GMT time change. Boost function. Building Regulations compliant, WEEE, RoHS.


  • 7 Day Programmable
  • 1, 2, or 3 On/Off Periods per Day
  • Digital Display
  • Suitable for Gravity-Fed & Fully Pumped Systems
  • 3 Pre-Set Programmes
  • 2 Wire Installation
  • Backlit Display
  • Battery Back-Up
  • Automatic BST/GMT Time Change
  • 1 Year Guarantee


Switching/contact rating: SPDT 3(3)A. H x W x D: 99 x 145 x 35mm. Backplate fit: Industry Standard. Suitable for underfloor heating.
Additional Information
Technical Specification
  • Brand : Honeywell
  • Product Height : 99 mm
  • Display Type : Digital Display
  • Product Type : Programmer
  • Programme Facility : 7 Day Programmable
  • Zoning Level : Up to Two
  • Central Heating Control Type : Programmers
  • Model No : ST9400C
  • Product Width : 145 mm
  • Product Depth : 35 mm
  • Pack Size : 1
  • Switch Type : SPDT
  • Suitable System : Suitable for Gravity-Fed & Pumped Systems
  • Installation Type : 2-Wire Installation
  • Compatible Boiler Type : All Boilers
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
1 off ST9400C 2 channel heating programmer
Delivery & Returns


Standard delivery service up to 3 working days: €8.95

Free delivery on all orders over €70.00

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Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


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€114.95 Incl. 23% VAT

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Honeywell ST9400C Programmer is rated 3.7 out of 5 by 93.
Rated 5 out of 5 by from Great product Simple interface without sacrificing functionality
Date published: 2019-04-28
Rated 5 out of 5 by from First Choice!!! Honeywell controls for CH & DHW systems have been my “go to” for years now. Easy to install, configure, programme and use. Particularly good for domestic users to understand and adjust to their requirements. I have no hesitation in using & recommending.
Date published: 2019-03-04
Rated 5 out of 5 by from Another Honeywell success I replaced this unit like for like, which made the process very straight forward.It was programmed for day date and time , which was nice and saved time, my only concern was that the original unit was only five years old, which seemed a bit short to me.
Date published: 2019-03-03
Rated 5 out of 5 by from Great replacement programmer Great replacement programmer, easy to wire up. This is a perfect replacement programmer for an old Honeywell Programmer!
Date published: 2019-02-26
Rated 5 out of 5 by from Easy Replacement for a ST6400C A Honeywell ST6400C controller went on the blink (literally) after 20 years of good service. Was not looking forward to replacing it but discovered that ST9400C used the same backplate meaning no rewiring and the new programmer fitted just by loosening the two screws at the bottom and swapping it over. The job took just 10 minutes. The product was in stock at my local Screwfix and was the quickest repair to a central heating system. The big backlit LCD display is a great improvement over the old ST6400C unit. Thank you Screwfix.
Date published: 2019-02-23
Rated 4 out of 5 by from Replacement controller Very simple to install if replacing ST6400 as uses original back plate. Timer settings easy to use with flexible control of both heating and hot water
Date published: 2019-02-18
Rated 5 out of 5 by from Easy Swap Had what I believed was a faulty controller and so decided to purchase a new one. Went for this as it was a direct replacement for an older unit and guess what, it was. Slipped into the old housing and worked great. Bonus was that it was a faulty controller and so everything great now. Easy to use, large display.
Date published: 2019-02-18
Rated 3 out of 5 by from honeywell ST9400c now on third timer since 2012. they seem to work well for a couple of years then develop internal fault where they switch of supply to 3 wire thermostats resulting in no call for hot water when heating is on and no call for heating when hot water is on. have found that this can be corrected by permanently switching off back light
Date published: 2019-01-12
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