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Posted 20 hours ago

Honeywell ST699

£9.9£99Clearance
ZTS2023's avatar
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ZTS2023
Joined in 2023
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About this deal

I've attached pics of the ST9400C wiring before and after the swap (ST9400c Wiring 1) and a pic of the remaining wires in the ST699. Ideally I would like a modern digital timer with flexibility for multiple programmes for different days and times and a wireless thermostat in the living room to control the temperature. And one that doesn't lose all it's settings whenever there is a power interruption!

PF Community Forums General Off-Topic Chat For Sale & Wanted Make a suggestion about the forum in general Is it a DIY job or something a professional should do, baring in mind I don't want to replace the whole system, just the timer/thermostat of the existing system?

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You have what they call BASIC SYSTEM 1 or 2. Gravity hot water, pumped CH and with/without room thermostat. Now just need to see how that maps to the ST9400. However you should ensure you know what went where on the ST699. The use of three blue cores, two brown cores and one red core coming into the ST699 is a recipe for confusion. Strangely enough the links between terminals is the least of the problems. But this has got me thinking, why stop there? Our boiler is controlled by an ancient looking Honeywell timer which from Googling I think is a Honeywell ST699 (except our version features a delightful brown/beige colour scheme!) There is also an equally old looking thermostat dial in the hall (just above the radiator which doesn't strike me as an ideal location!). You had a hard wired link between Live, 5 (common for CH) and 6 (Hot water on). That's why I thought your hot water was permanently on. There was also a hard link between 3 (CH on) and 7 (HW off). Then there were connections to all four terminals for CH on/off and HW on/off which is not normal. So I wonder if the other end of those wires go to the expected places.

Hi, I drained the the central heating, to remove a radiator. After refilling it, the heating now won’t work. More Add Plumbing Business Post / Search Plumbing Jobs Add Plumbing Video Advertise on PlumbersForums.net This is the existing wiring of the st699 I want to upgrade to a hive. I follow everything except the second blue wire that is going into the neutral port. The darker blue wire looks like an actual neutral wire , could the light blue wire be a switching wire that should have gone somewhere else? Hot water and heating calls currently work fine , occasionally the boiler fails to turn off but this is intermittent. I opened up the Honeywell wiring hub near the boiler power switch to try to get a better idea of what the wires were doing

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As this information is anonymised and aggregated it cannot be used to identify any individual user actions. I assume the current picture of the ST699 is after it has been removed from the wall and it's sitting on a table so to speak.

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