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Thanks everyone. It was the restrictor/strainer in the cold water mains valve. When I took it out it was 'caked' with scale. Hot water (and heating) is now perfect. Is there anything I can do to prevent this scale build up as I am obviously in an area prone to this? I'm wondering what it is...

Thanks. No I didn't remove it completely, just plenty enough for a spray of water. I think it's a water flow problem. This only happened after a recent CH draindown. 2/3 weeks ago HWS was no problem and the CH is working fine. I'll see what happend tomorrow when I check the flow limiter/strainer...

Okay, I see what you mean. The manual says the valve has an automatic limiting device and strainer inside which could well be partly blocked. Too late for me to do now but will let you know outcome tomorrow evening.

Thanks for all your advice but I'm getting so frustrated!! I definitely have cold water through part 98 to 64 at 84 (if that makes sense from the previous parts diagram) The restrictor on 98 is fully open counterclockwise - I have not altered this ever. There is definitely CW pressure to the...

Sounded like a good suggestion but cannot find little green thingy!! Maybe I'm just colour blind or plain blind. Any other suggestions please?

I've checked the points previously raised. The microswitch when depressed activates the red LED. However, if I detatch the locking nut and insert the microswitch fully into the flow valve/switch the red LED is permanently activated. If I install with the locking nut between the 5.5mm and...

Thanks - I've been away 10 days so just seen reply. I set switch distance same as replaced unit but I guess new one could be different - hard to tell, but I'll adjust as you suggest and see if any difference. As with a previous response, I don't think the switch actuates because there is...

Thanks. Hard to tell because nearest tap not that close (am on own). Normally when I turn on a hot tap I can hear the boiler fire up almost immediately. Now there seems to be nothing but a slow trickle of water. You seem to be suggesting there is not enough mains flow to set the controls in...

I replaced the flow switch and microswitch exactly as it was with a 5.5mm gap as indicated in the manual. Switch wires are connected. Not checked board though. Will do so this evening. DHW & CH were both working fine before drain down, so I am mystified what could have caused problem. When I...

Yes, all valves open including mains stopcock. Reading other similar posts it seems the red LED indicator is important. When I open a hot tap the red LED is NOT lit, hence why I replaced flow switch.

I've recently drained down heating system for maintenance. After refilling, venting and adding inhibitor the heating is working fine. However, I now cannot get the hot water to work. Water just dribbles out of the taps and very hot. I followed the fault finding flow chart in the manual and have...