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fault on viessmann boiler

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Tom Eigo
Tom Eigo Member Posts: 8
in THE MAIN WALL
I'm having a problem with one of our boilers. We have two Vitodens 200 modulating. The boiler #2 which is dedicated to the domestic hot water(indirect Super Stor) doesn't seem to be working. We have a service tech here now, but without luck. The cascade board(module) is blinking for boiler #2. And the fault states ouside sensor. We can't seem to get it bypassed in order to get the DHW going. On boiler #2 I noticed there's no setting for temperature and was wondering if this could be the cause. Any suggestions would help. Lake George NY
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