PRODUCT SAFETY NOTICE: LAP Floodlights More Information

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

Click here to see information on our delivery charges and times



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.


Click here to see information on returns and cancellation

€110.95 Incl. 20% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
Honeywell ST9400C Programmer is rated 3.6 out of 5 by 83.
Rated 5 out of 5 by from Great Programmer Had to replace the same model of programmer after 10 years. Very easy to change, so was up and running again in no time. The only downside is that it is relatively expensive.
Date published: 2018-12-21
Rated 1 out of 5 by from Programmer not programming Had one of this model for around ten years, no problems until it finally died early 2018. I am now on my third one from Screwfix, they all bring on hot water/heating outside the set programme plus they keep changing their modes which amounts to the same thing. Eg., I find the hot water is on at midnight-crazy. I have had enough and I am changing to a different make money refunded or not. It does not do "what it says on the can".
Date published: 2018-12-14
Rated 4 out of 5 by from Heating Programmer REplacement programmer, ths seems much better more functions and better backup battery. This seems like a great unit!
Date published: 2018-12-05
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
  • y_2019, m_1, d_14, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.9
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_83
  • loc_en_GB, sid_88608, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie