Looks like it's on the unit itself ...
http://www.mariespoolstore.com/Websi...20AquaPure.pdf
"Service and Service Code The SERVICE indicator will turn on whenever the AquaPure detects a
problem that requires attention. The SERVICE indicator is accompanied
by a service code displayed on the front panel, displayed as a 3 digit
code. The service code(s) are displayed twice per minute with an audible
alarm"
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