Honeywell ST9400C Programmer

Product Code: 88608
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.
€96.95 Incl. 20% VAT
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Additional Information
Technical Specification
  • Brand : Honeywell
  • Manufacturing Standards : Building Regulations Compliant, CE, WEEE, RoHS
  • 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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Honeywell ST9400C Programmer is rated 3.4 out of 5 by 66.
Rated 5 out of 5 by from Just the job I purchased this programmer for a customer who had the previous ST6400C programmer as an integral part of their Stanley Cooker/boiler. It was a bit more expensive than going elsewhere but it's Christmas, Screwfix had it on the shelf at a branch, so I could get the job done before my customers visitors arrived. They were more than happy to pay the small premium. I have fitted these programmers before so can give it top marks for features, reliability etc.
Date published: 2016-12-31
Rated 5 out of 5 by from Replacement unit Had a problem with my old controller. Either provided hot water or central heating. My heating engineer came out and recommended this unit. Said it would be easy for me to fit. He was right. Two screws to loosen, replace unit onto original backing plate and re-tighten screws. Five minute job. Now have perfect system and increased programming options.
Date published: 2016-12-24
Rated 5 out of 5 by from Complicated but good This programmer is not for the customer who wants a simple on/off clock, it has all the features for a domestic household who need to program their heating daily. Easy to install, wiring easy.
Date published: 2016-12-19
Rated 5 out of 5 by from All good Firstly I've only had this item a couple of days so the reliability score is, ironically, not that reliable but hopefully it will be accurate. It was purchased to replace a second Drayton LP722 programmer which failed within 6 months, the previous one only lasting 2 years. Hopefully this one will have a longer lifespan. Mounting plate compatible with the Drayton so it was an easy remove and replace, no wiring to be done. Honeywell provide a compatability chart on their website too so you can check. The programmer has plenty of functions and features like boost times and holiday modes and it was a doddle to set up. It seems well built and worked straight out of the box.
Date published: 2016-11-01
Rated 1 out of 5 by from Built-in unreliability. Had one of these fitted 2 years ago, and we've just had to replace it. As other reviewers have said, it's about the most expensive controller in the Screwfix book and it seems like it's designed to pack up after a couple of years. The lights come on, but it doesn't tell the boiler to start up. Keep pressing buttons and it may work, or may not. Had to buy another unfortunately, a) to prove the first one had packed up, and b) to avoid the cost of an electrician to fit another type. Don't do it, look by all means then move on to a cheaper product. Had to give it one star for reliability because there isn't a "no star" option.
Date published: 2016-10-11
Rated 3 out of 5 by from IGuy Good Product but does not piggyback on to Potterton ep programmers as some sites say it does. Only Potterton EP2 does this so that the Back plate with its wiring needn't be rewired. Great for DIY'ers no need for an electrician. Very quick procedure (less than 5 minutes)
Date published: 2016-07-28
Rated 5 out of 5 by from Honeywell done it again Bank Holiday weekend and a return client needed hot water and heating asap - thankfully Screwfix had the item in stock - job done within the hour. Honeywell programmer is easy to use and set - always use this product if possible.
Date published: 2016-05-02
Rated 5 out of 5 by from Good Programmer Old unit went down typically when it was cold weather. Picked new unit up locally and fitted it. Up and running within 30 mins from start to finish.. Fitted onto old backplate, bonus, programming easy.
Date published: 2016-04-27
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