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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€106.95 Incl. 23% VAT

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Honeywell ST9400C Programmer is rated 3.5 out of 5 by 76.
Rated 5 out of 5 by from Great programmer Bought this to replace old ST9400C which was 5 years old. Easy to replace took 5 minutes.
Date published: 2018-01-02
Rated 4 out of 5 by from It's a programmer Fitted for a customer as a replacement for a faulty ST6400C. Working ok and easy to swap. Time will tell regarding performance & reliability?
Date published: 2017-12-15
Rated 5 out of 5 by from Easy to instal Bought to replace old Honeywell unit (after 24 years) which faintly gave up the ghost. Using same backplate, took just a minute to replace, and factory settings, time etc were spot on. Worked a treat and was easy to set to our own custom timings. A tad pricey, but worth it for ease of replacement and trouble free operation.
Date published: 2017-12-14
Rated 5 out of 5 by from Honeywell ST9400c Direct replacement for old ST6400C which had decided to throw it's hand in. No need to replace the back plate as the 6400 and new 9400 use the same plate, although I did replace it as the contacts were becoming a little tarnished. Pre-installed programmes a bonus, but easily changed to your own requirements. Factory set time was within 1 minute of actual time. Like the idea of automatically changing for daylight saving.
Date published: 2017-12-05
Rated 5 out of 5 by from Too cold to go without Product is great. Our older model just broke down so we needed this quick with it being cold at moment. It was really easy to remove the older one and fit the new one. All we had to do was remove some screws and replace them then we were up and running again. No need for electrician!
Date published: 2017-12-02
Rated 5 out of 5 by from Mixed opinion I bought this programmer to replace existing unit. Mainly because it was a very quick fit onto existing backplate. The original (identical) unit puzzlingly failed by ceasing to send signal to boiler although it appeared perfectly normal. Apparrently this is a known problem with weakend capacitors on circuit board. Can't reccommend. Although this is a great piece of kit when new.
Date published: 2017-11-16
Rated 5 out of 5 by from Replacing previous programmer This replaced my previous programmer whose backup battery had failed. It went straight onto the existing backplate and was much easier to setup. Auto changes BST/GMT.
Date published: 2017-10-18
Rated 5 out of 5 by from Direct replacement Easy to install and reliable. This was a direct replacement for faulty unit which was over 10 years old. It was also £6 cheaper than original.
Date published: 2017-10-11
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