I have an vailant 837 R1 eco tec boiler, the diverter valve is leaking, is there a kit for repairing this or should I buy a new valve, and can it be replaced without removing the pump,
There is no kit available, a new valve is the only option.
It can be replaced without removing the pump, when taking it out just remove the screw (bottom left of the pump) that holds it to its retaining bracket allowing it to swing forward for removal replacement of the diverter.
Just as a footnote, to save lots of water going everywhere when removing the diverter (even after draining both sides) use P6 to put the diverter into mid-position for better draining before removal.
Carefree
February 2011
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.