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water pressure indicator at zero water cold what does this mean?

water pressure meter is at zero.have tried using white key to no avail.what do i do ?

p bailey
February 2012
we have tried this and it still will not fill

pat
February 2012
It means you need to re pressurise the system via the fill loop. Fill till meter reads 1.0 to 1.5

Tony Wilson
February 2012

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