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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
  • View more information

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.

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Honeywell ST9400C Programmer Instruction Manual


3.2308 5 26

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Honeywell ST9400C Programmer 3.2 5 26 26
Honeywell Programmer Seems like a great product marred by poor reliability. This is my third: first lasted two years; second lasted three months; jury still out on third one. But excellent customer service from Screwfix - item collected and installed less than 50 minutes after ordering on line! And their website is a doddle to use. 19 Jan 2015
ST9400C is prone to failure I had a new central heating system fitted four years back and had an ST9400C unit fitted as part of this, it failed in Oct 2014. My plumber fitted a replacement ST9400C unit, after less than two months it has failed. The programmer turns the central heating on randomly and it turns the central heating on when you have programmed it to generate hot water. I now have the hassel of getting this replaced again, thanks Honeywell. My Father had a similar unit installed three years ago, his failed last month. I think Honeywell are selling this shoddy products at premium prices, I will not be using them again. I'm so annoyed about this that I took the trouble to register with screwfix in order to warn people. 18 Dec 2014
Poorly made My heating engineer fitted one of these as a replacement to the old one that had lasted over 13 years ! It has gone wrong after 18 months and out of guarantee, my local heating man said he has had to replace 3 others in the last 2 months. I understand the relay inside has failed, poorly made !! 9 Nov 2014
Unreleable Programmer Don't buy one of these. They may seem very good while working but they are very unreliable. They fail after the guarantee expires. Don't take my word for it please check the internet. There are a lot of other disappointed customers out there. The happy ones probably wrote their reviews shortly after purchase and haven't owned the programmer long enough for the problems to manifest themselves. Honeywell customer service is also not very good. Long waits on the telephone & then not helpful. 29 Oct 2014
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Brand Honeywell
Colour White
Manufacturer Guarantee 1 years
Manufacturing Standards Building Regulations Compliant, CE, WEEE, RoHS
Model No ST9400C
Pack Size 1
Product Depth 35 mm
Product Height 99 mm
Product Length 145 mm
Product Width 145 mm
Total Product Weight 0.268 kg