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You may have some sludge dislodged and trapped in the system, to me it sounds like blockage, do you have any filters in the system? You may also have zone valve issues.

I've done some price checking and comparison, the salus thermostat is only £27 on ebay, everybody thinks it is not very reliable. To get good quality reliable product like honeywell etc I would have to spend around £100, if I add £78 I can get Hive system for 178 from screwfix, may aswell do that

Honeywell are twice as much expensive too, I think I'll get salus product, thanks for advice anyway

I think I'll just get Salus RT300RF http://www.ebay.co.uk/itm/SALUS-RT300RF-DIGITAL-WIRELESS-ELECTRONIC-THERMOSTAT-/400149438328?hash=item5d2ac3df78:g:8g8AAOxy63FSvZvi Would it be possible to wire it in S plan setup ? It should be

The HW on this system is controlled by cylinder stat which in turn activates zone valve and than the pump, boiler fires up etc, Can I wire in room thermostat to CH zone valve to work similar to HW ?

I was thinking about hive, but it is too big for me now defenitely in future after boiler replacement, see photo of programer Thanks

Hi all, we have recently moved in to our new house where I've spent quite a lot of time getting central heating working, basically it is quite ancient setup with loads of corrosion in the system but it is still going. In near future (2-3 years) I would like to convert it to combi boiler. At...

Thanks mate, I had Sentinel X800 added to the system 2 weeks before first valve fault than I have put X100 inhibitor, I'm worried that these products dislodge large chunks of rusty sludge. Than it travels in the system to cause trouble, anyway nothing more I can do at the moment, I will probably...

Looks like this is not the end of problems with my zone valves, I've turned off CH earlier on this evening and noticed that all radiators stay hot. Using the same method as before I've checked zone valve for CH and it shows the same symptoms also the lever has very little resistant movement...

Thanks for all your advice, Happy Christmas

I have 2 tanks in the loft, The open vent pipe on top of central heating tank is actually submerged in tank's water ( by about 5-10 mm) is this ok? Obviously the bottle test can't be done at this point. I will have to lower the level of water in the tank

Thanks footptints, I will do that, this sytstem is very old and probably never looked after properly, I have already done a lot of cleaning work including 5 radiators were removed for flushing, we only live there since May and obviously when cold days came and CH was in use all the faults started.

I have installed new honeywell zone valve and yes I had to remove the whole pipe assembly to clean it, yes it was really clogged up. It is now working as it should, I'm now quite worried about the rest if the ststem including the boiler.

Took zone valve off to confirm and found blockage see images

Thanks footprints, Yes when the power is off it gives resistance on lever when moving to man/open and it is whirring when released on way back to original position. At the moment I've turned all off to cool down and will check pipes temperatures as suggested by stem

Hi all, I have recently done some maintenance work on my heating system, I had to clean it which involved radiators and header tank removal. The system was heavily contaminated with sludge and rusty water, it is open system with baxi solo boiler, and indirect water cylinder. After all this work...

Hi all, I'm new to this forum and I think it is absolutely fantastic, I've found so many answers here as I am proud diy'er, anyway I suspect zone valve on my HW is permanently open, basically when HW is off and CH set to on at the control panel I get very hot water coming from taps all the time...