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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 service up to 3 working days: €8.95

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€113.95 Incl. 23% VAT

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Honeywell ST9400C Programmer is rated 3.6 out of 5 by 80.
Rated 1 out of 5 by from Don't buy this product The timer has gone completely screwy after 1 yr of use. it will only allow water heating only and then only from a programmed time. For your sake please don't waste your money on this overpriced junk. I have been an electronics designer for 37yrs and I can't believe Honeywell are still in business selling complete rubbish.
Date published: 2018-11-29
Rated 5 out of 5 by from cb99 Replaced same type I had (Honeywell) that was 18 years old this seems a lot more polished, time will tell but no problems as yet.
Date published: 2018-08-16
Rated 5 out of 5 by from Best Programmer One of the Best Programmer in the market for 2 Channel System. Very much Reliable. Very simple to Use .
Date published: 2018-06-09
Rated 5 out of 5 by from Honeywell ST9400C Programmer This was bought to replace the old ST9400C. I used the old back plate which was the same. Once fitted and electric switch on, surprise, surprise the clock & timer settings came back the same as the one removed, which was bonus
Date published: 2018-06-04
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
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