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by cal
Tue Nov 27, 2007 9:32 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

That is an excellent description arni, and after long hours staring at wiring diagrams and reading through honeywell fault finding pages, is something like what I was thinking could be happening. If you could somehow post that diagram I would like to see it. What I don't understand now is, why switc...
by cal
Fri Nov 23, 2007 4:54 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

Thankyou to you all who answered, I think the solution has finally been found :D It hadn't occured to me to check this as the voltage was present on the orange wire of 3pv when removed from wiring centre, but it seems it was the frost stat that was keeping the boiler fired! I quickly went back last ...
by cal
Wed Nov 21, 2007 8:12 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

Had no joy this evening, went back and wired out the cylinder stat, and found the same problem, :cry: In answer to marrtin 1. Removing the programmer from the backplate DOES cut the boiler out and make it stop, 2. There are no cable links wired to the programmer. 3. The white wire from the 3pv is co...
by cal
Mon Nov 19, 2007 8:18 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

Cheers guys, feel I'm getting close now. Just got a fault finding e-mail from honeywell, it states that a.c. voltage may appear on specified wire or terminals due to back feed from Three port mid position valve. What are the possibilities of this back feed passing through the cylinder stat & mak...
by cal
Sat Nov 17, 2007 4:14 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

Been back today with an electrician and multimeter, Found that the orange wire from the honeywell 3 port valve, (the switch live), is not completely losing voltage when CH is switched off, The readings on this wire go Hw on = 240v / Hw off = 0v (as expected) CH on = 240v / CH off = 100v which is kee...
by cal
Sat Nov 17, 2007 8:35 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

Thanks for your reply, the system is a bodge but as far as I can see matches up to the diagram I have from baxi, The wiring centre is boss therm and is in the airing cupborard, so terminal block numbers don't match up but wires seem to. The fuse spur and boiler terminal block are located under the h...
by cal
Fri Nov 16, 2007 5:19 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Nightmare system wont turn off.
Replies: 14
Views: 15976

Nightmare system wont turn off.

The boiler is a baxi system boiler 60/100, the heating is an unvented sealed system, with open vented hot water cylinder and tank. External controls are; Siemens RWB9 programmer (working), Boss therm room stat(eliminated), Boss therm cylinder stat (working) Newly replaced Honeywell 3 port valve, old...
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