Haier HRF580YPS User Manual page 21

Water filter function:
After 6 months since the product is powered on for the first time, indicator "F"
(Water Filter replacement Prompt indicator) lights up as a reminder to replace
water filter. After replacing the water filter, press the key "P" (Water On function
selector) for 3 seconds, after hearing a beeping sound, indicator "F" (Water Filter
replacement Prompt indicator) goes off, the Water Filter Replacement Prompt
function is reset.
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