Recent content by Tintin007

Black combustion cover back on properly ! Have discovered what the problem is - although the temp gauge sits at 60C when the boiler is running it is telling fibs - I put the probe into a cup of boiling water straight from the kettle and it reads 75C ! Does this mean the main PCB is...

Well - have vented some air out of the system and relit the pilot and now the main burners are firing up fine. Did not do anything else so another Sine 18 that does not work after relighting the pilot. Replacement flowswitch working and the spindle rising at the back of the valve (never dis...

Thought it might be - have vented it and swapped the valves over but am no further forward.... No HW or CH - main burner not lighting at all. Can hear various clicks that normally precede the main burner lighting but no main burner ! Have pressed the black over-ride but no change and have...

Still waiting on the replacement valve (UPS had problems picking up my old one) so ended up removing what Vaillant describe as a heat-exchanger. The tank that sits in front of the flowswitch. Flushed it through with plenty of water. There was a drainplug in the middle of the bottom but there...

Removed top half of valve - seems ok, nothing jammed or stuck. Wax capsule is the culprit - it does not move far enough or strongly enough to operate the valve in the main body. Will pack it up and send it off for a reconditioned unit which should be here in a couple of days. Hopefully...

Sounds like I need to take the valve off again again and have a look at the top section and see how munge there is in there.... I did take off the section above the wax capsule housing but that did not really help ! The left hand microswitch looks strange since the lever/bracket that...

Right hand switch (red and brown wires) was not adjusted properly - when in the rest position it was making contact. I have adjusted the nyloc nut to allow the spindle to move higher and now the switch is open (no contact) when at rest. Boiler is now quiet (normal) when pilot lit. Boiler still...

It is only moving about 4mm or so - I will check if the microswitch is working correctly. I can press it down the 4mm and the spring looks compressed - ie it cannot move down anymore. Does that spindle move downwards against the spring when boiler is operating correctly ?

Thanks for the quick reply - I was worried I had now got a different fault. The valve that the pin pushes against is pretty strong so all I have done is show up the fault at the top end of the valve. When I had HW if I pushed the spindle (at the back of the flowvalve) down the main burner...

I have a Vaillant Sine 18 which has worked flawlessly for more than 18 years. I was in hospital for a week and when I came home I had HW but no CH. When I flicked the programmer the main burner came on for 30 secs or so then went back to pilot. I checked the flowswitch (diverter valve) at the...