I have a vaillant 828 e turbomax first my dhw heeat exchanger stopped working so i replaced it.
then about 3 months later the diverter valve stopped working so there was no hot water but heating was still working for about a week then that stopped.
put a new diverter valve on but nothing no hot water no heating
green light comes on for about a minute then goes outon heating.
on hot water temp guage climbes rapidly to approximatley 70 degres then shuts off with no hot water help i am at a loss and it is cold
then about 3 months later the diverter valve stopped working so there was no hot water but heating was still working for about a week then that stopped.
put a new diverter valve on but nothing no hot water no heating
green light comes on for about a minute then goes outon heating.
on hot water temp guage climbes rapidly to approximatley 70 degres then shuts off with no hot water help i am at a loss and it is cold