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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



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Rated 4 out of 5 by In control Brought as a direct replacement to another which had failed in auto mode, CH not coming ON as programmed, HW all OK. After manual over ride all is well again? One of the problems I find with all electronic devises is that there is little you do beside replacement.......built in obsolescence! This is a good product with a fairly straight forward set up / programming, end user in this case likes the features. 16 Jan 2016
Rated 5 out of 5 by Honeywell ST9400C programmer My ST6400C programmer failed whilst on holiday. Bought this product (replacement model) and all I had to do was plug it straight onto the original backplate with no need to rewire. This then ensured that all other thermostat controls in the house continued to work. 1 Jan 2016
Rated 1 out of 5 by Poor quality device My experience is just as bad as the other reviewers have found. These devices would be excellent if they didn’t break down so often. I’d give 5 stars for features if the device would work long enough to make use of them. I had some good help in diagnosing the fault from Honeywell support people, but when I asked if they would offer an extended warranty on a new one, in view of the track record, I got no reply. Not really surprised that they ignored me. But I am surprised that any supplier would go on selling them. Do NOT waste your time on this poor quality device. 17 Dec 2015
Rated 5 out of 5 by Honeywell Best make for controlsdont use anything else easy to use and very easy to fit 8 Nov 2015
  • 2016-02-11 T06:18:36.045-06:00
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2 Dec 2015
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Download more info (pdf)

Brand Honeywell
Colour White
Display Type Digital Display
Installation Type 2-Wire Installation
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 Type Programmer
Product Width 145 mm
Programme Facility 7 Day Programmable
Suitable System Suitable for Gravity-Fed & Pumped Systems
Switch Type SPDT
Total Product Weight 0.27 kg