Overall based on 20 reviews
Didn't last
Hutchie26, 5. Nov 2013
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I bought this thinking I was buying quality and reliability - none of it. Setting the programmes is amazing slow and clunky but I thought I could live with that. The unit has now failed after a little more than 2 years (obviously now out of warranty) so I have to buy a replacement - don't worry it won't be a Honeywell!
Too unreliable
PecuniaryChallenged, 21. Sep 2013
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I have three of these controllers installed to control different parts of the house. One failed after 1 year. The controller would turn itself off and then on again every few minutes. The second failed after 2 years, the relay only turns the heating on every now and again at the designated start up times. The product is easy to set up and contains some useful features but falls down on the most important quality you need from a controller, reliability.
Too unreliable
builtit, 9. Sep 2013
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Lasted about 18months and has intermittent faults It's really annoying having no hot water when you need a shower or coming home/waking up to a cold house because it decided not to work today.
Honeywell ST9400C Programmer
Rachy, 31. Aug 2013
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Programmer fitted the rather older model space and is doing the job.
Good but....
jimmy1glove, 12. Aug 2013
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Good Programmer but not having an industry standard backplate means i needed to get an electrician in to install it, this addedd to the cost. The backplate is the same but with an aditional piece to prevent you using other manufacturers in the event of failure, If i had known this i would have opted for a Drayton , Siemens, Horstmann or any other as they all use the same backplate and interchangable with no wiring changes and no need to call out an electrician.....
Pleased with this so far
BarneyR, 1. Aug 2013
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Only used this Programmer now for approx. one month but very pleased with it to-date. Still to use holiday programme. Great that it just fitted into existing backplate from previous Honeywell Programmer.
Very good programmer
HMAH, 5. Jan 2013
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The plumber suggested this over the 'cheap' ones. It looks and works great. It has a backlit display - so much better than the last one.
Central heating system program
aldrake, 30. Dec 2012
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The product was as expected from an organisation with a good name like Honeywell, it was easy to install and the directions for use relatively simple to follow.
easy to fit replacement
redal, 6. Dec 2012
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I needed to replace a faulty type 721 programmer and this unit was a straight replacement.Just removed the old unit and plugged in this one no messing, even the date and time were correct, brilliant.
Load of rubbish
chummy, 11. Oct 2012
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Had this piece of rubbish installed 14 months ago. Nothing but trouble. Would only let me have either hot water or heating but not both at the same time. Was told by the fitter who came and fitted a danfoss to replace it that I was lucky to have got 14months out of it. Will not be buying any of Honeywells products in future
Faulty on install
WoodleyUser, 23. Sep 2012
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Had one of these fitted as part of a boiler replacement. Gave trouble from day one with intermittent hot water and no heating at all. Spent weeks (and money) chasing other faults around system with re-visits from Installer and Baxi (The boiler manufacturer). Eventually decided controller was faulty, quick google of "Honeywell ST9400C Problems" revealed other people with the same issue. Replaced with a Siemens controller from this website (for half the price!) and Heat and Hot Water were restored!
Excellent - but will it last
currantbun, 25. Jul 2012
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I used this to replace an existing one that had only lasted a couple of years. After fitting (which was very easy due to the universal backplate) i spoke to a neighbour who told me about half the estate had had these programmers replaced. Maybe in hindsight i wouldn't have fitted it, however i can't fault it while it does work. Very good, easy to understand but fully featured. Excellent price as well.
Continuously faulty
Wombat1, 12. Apr 2012
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We are now onto our 4th controller. We have consistently had the heating controller "magically" turn itself off, without interventrion. WE had had the electrician in, the plumber, heating engineer. The replace the controller completely but it sporadically happens again. In researching on the internet we appear not to be the first people to have this happen....but Honeywell deny a problem. Don't touch this controller with a barge pole!
The best!
misterc, 9. Mar 2012
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I've installed many of these over the years, and for ease of installation, features and reliability nothing beats it.
Good - when it works!
AncientMeddler, 2. Nov 2011
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Good features, easy to fit. However, reliability and quality control are not up to Honeywell standards. The first controller was defective out of the box: the display wouldn't light up. Screwfix replaced it under warranty. The second unit lasted only three years before it failed: wouldn't send power to the motorised valves. I wonder how long the third unit will last??
Excellent performer
slycy, 25. Mar 2010
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I reqired a controller for our local church which was versatile, easy to use and install. It replaced two timers controlling two zones and needed to be easily operated. A seven day programme was a must since Sunday is the main day. Fitting was straight forward and the large display is excellent. The override feature is very handy.
Looks good, easy to install
Tuna, 15. Jan 2010
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A good looking, well thought out little timer. Easy to install and easy to operate. Display is excellent and price is good.
Honeywell ST9400C Programmer
awosborne, 16. Dec 2009
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a quality Replacement for my old, and faulty, timer/pgrammer. clearly well buit, with sturdy casing and a good display window for easy reading in a poorly lit (under shelf) location. A well written installation note ensured no problems with replacing an older Honeywell model. but, as always, ensure the backplate is cleaned of debris My only problem was in the poor connectivity with the contact pins as previous debris prevented a flush fit - presenting as poor power connection and a therefore a 'dead' display. Once the backplate was cleaned, and the new unit re-presented, this problem was never seen again
Ideal Replacement
AdamR, 8. Dec 2009
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Used this as a direct replacement for my faulty ST6400C. First impressions being this is a far superior product. Easy replacement, used existing backplate .... job complete in under 60 seconds !
Excellent and easy to use
Penny, 4. Feb 2009
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Purchased this programmer to replace existing older version. Easy to install. You simply take off the front of the old one and place the new one on the back plate left on wall. An improvement on the old including a better, lit display. I would recommend this product.
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