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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: €15

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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€113.95 Incl. 20% VAT

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Honeywell ST9400C Programmer is rated 3.5 out of 5 by 21.
Rated 5 out of 5 by from CH/HW Controller Needed to replace my 25yr old ST7100. Changed back-plate followed wiring instructions, switched back on - worked. Screwfix not cheapest but available locally. Can't tell about reliability but would like to think this controller will also last 25yrs :)
Date published: 2014-09-14
Rated 1 out of 5 by from Didn't last I bought this thinking I was buying quality and reliability - none of it. Setting the programmes is amazing slow and clunky but I thought I could live with that. The unit has now failed after a little more than 2 years (obviously now out of warranty) so I have to buy a replacement - don't worry it won't be a Honeywell!
Date published: 2013-11-05
Rated 1 out of 5 by from Too unreliable I have three of these controllers installed to control different parts of the house. One failed after 1 year. The controller would turn itself off and then on again every few minutes. The second failed after 2 years, the relay only turns the heating on every now and again at the designated start up times. The product is easy to set up and contains some useful features but falls down on the most important quality you need from a controller, reliability.
Date published: 2013-09-21
Rated 1 out of 5 by from Too unreliable Lasted about 18months and has intermittent faults It's really annoying having no hot water when you need a shower or coming home/waking up to a cold house because it decided not to work today.
Date published: 2013-09-09
Rated 5 out of 5 by from Honeywell ST9400C Programmer Programmer fitted the rather older model space and is doing the job.
Date published: 2013-08-31
Rated 3 out of 5 by from Good but.... Good Programmer but not having an industry standard backplate means i needed to get an electrician in to install it, this addedd to the cost. The backplate is the same but with an aditional piece to prevent you using other manufacturers in the event of failure, If i had known this i would have opted for a Drayton , Siemens, Horstmann or any other as they all use the same backplate and interchangable with no wiring changes and no need to call out an electrician.....
Date published: 2013-08-12
Rated 4 out of 5 by from Pleased with this so far Only used this Programmer now for approx. one month but very pleased with it to-date. Still to use holiday programme. Great that it just fitted into existing backplate from previous Honeywell Programmer.
Date published: 2013-08-01
Rated 5 out of 5 by from Very good programmer The plumber suggested this over the 'cheap' ones. It looks and works great. It has a backlit display - so much better than the last one.
Date published: 2013-01-05
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