Vaillant 428, SFH code

krazaq · 7 Sep 2011

Wired up the boiler, have this code SF.H flashing, and sometimes it comes on and sometimes it does not. Pump is also on. Nothing in manual.

any ideas. Wiring is correct and checked again and again. Uusing the Honeywell y plan,

kevindgas · 7 Sep 2011

service mode code. pressing - & + together activates press reset to deactivate

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Vaillant 428, SFH code

krazaq

kevindgas

DIYnot Local

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