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have vaillant eco max 828 will not heat on demand when on anti cycle ie s04?

have vaillant eco max 828 will not heat water on demand when on anti cycle ie S04

david thrower
November 2006
VaillantHeating, Home Heating SystemsHeat Cycle Water
Go in to Diagnostics and select D22. Turn on hot tap and read the code which should be "1". If it's 0 while the hot tap is open, then the aqua sensor needs replacing.

John
November 2006

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