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b) Internal Booster Tank Auto Fill Error (A2)
• In the auto fi ll cycle, if the internal booster tank water level fl oat switch does not close within
10 minutes after the cycle starts, the unit shuts down, "A2" appears in the display, and the
buzzer sounds.
• To reset, use the "ON/OFF" button to turn the unit off and then back on.
• See the chart below for possible causes and remedies.
Booster
Not ready for
operation.
Get it ready.
Strainer
Filter clogged. Clean.
Filter clogged. Clean.
Defective. Replace.
Water Valve
Open circuit. Repair or replace.
Open circuit. Repair or replace.
Control Board
Connector not properly
connected.
Reconnect.
Defective. Replace.
Water supply pressure
too low.
Readjust.
Internal Booster Tank
Water Level Float
Switch
Connector not properly
connected.
Reconnect.
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”
Internal booster tank water level float switch
does not close within 10 minutes after the auto
fill cycle starts.
A 2
Code Error
Item Possible Cause Remedy
Unit stops.
Operation