i wanted to thank all the corgi people and competent diyers who posted responses to similar problems to mine.
sifting thru them pointed me to a solution which i hope may help anyone experiencing the same with their VAILLANT VCW GB242 EH
after checking the function of the servo and the diverter.... the servo cam was turning and activating the microswitch... the diverter was correctly moving between the heating and hot water positions.....
edit: please be aware this may only be a temporary solution and as is mentioned further in the thread the underlying problem is probably something like the servo valve
the solution
i noticed that one of the microswitches on the diverter wasn't being triggered properly... i made a slight adjustment of about 1mm and hey presto!
step by step if it helps
to get to the diverter, i took off the cover on the right side of the boiler. at the bottom is a semi transparent plastic cover thru which u can see 2 microswitches and the diverter
when i took off the cover i could see the diverter properly and watch it moving as i selected either hot water or heating... at this point i noticed the metal prong at the top (for want of a better word) was only just making contact with the top microswitch... presumably any vibration was letting the switch pop out again... there are 2 bolts to allow adjustment of the prong
thanks again for everyone who contributes to the forum, you saved me from a freezing cold christmas
sifting thru them pointed me to a solution which i hope may help anyone experiencing the same with their VAILLANT VCW GB242 EH
after checking the function of the servo and the diverter.... the servo cam was turning and activating the microswitch... the diverter was correctly moving between the heating and hot water positions.....
edit: please be aware this may only be a temporary solution and as is mentioned further in the thread the underlying problem is probably something like the servo valve
the solution
i noticed that one of the microswitches on the diverter wasn't being triggered properly... i made a slight adjustment of about 1mm and hey presto!
step by step if it helps
to get to the diverter, i took off the cover on the right side of the boiler. at the bottom is a semi transparent plastic cover thru which u can see 2 microswitches and the diverter
when i took off the cover i could see the diverter properly and watch it moving as i selected either hot water or heating... at this point i noticed the metal prong at the top (for want of a better word) was only just making contact with the top microswitch... presumably any vibration was letting the switch pop out again... there are 2 bolts to allow adjustment of the prong
thanks again for everyone who contributes to the forum, you saved me from a freezing cold christmas