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How can I fix my Vaillant Turbomax Plus 8246 Boiler?

My Vaillant Turbomax boiler is only responding to the call for instant domestic hot water, the heating is not working. The error code S.30 is being displayed, I have changed the room thermostat and still no joy, what else could it be?

Andy Davies
July 2007
VaillantHeating, Home Heating SystemsBoiler Call Water
Did the original poster ever find a solution? Our Vaillant gives S.30 (no demand) in the evenings, although the thermostat seems fine (green light comes on, boiler does not respond). It previously worked fine for a year with no wiring changes. I suspect a logic circuit and/or a sensor input we cannot see. Thanks, J.

J Hinton
February 2009
have you also got your timer set to call for heating? and is the room stat set high enough

gary.wright53@googlemail.com
August 2007
s30 is no call from external heating control

that tells me your room stat is faulty or wired wrong.

hi-spec plumbing
July 2007

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