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b) Booster Tank Auto Fill Error (A2)
• In the auto fi ll cycle, if the booster tank water level fl oat switch does not close within 10 minutes
(or 20 minutes in "READY" mode) 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 Tank
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.
Booster Tank Water
Level Float Switch
Connector not properly
connected.
Reconnect.
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”
Booster tank water level float switch does not
close within 10 minutes (or 20 minutes in
“READY” mode) after the auto fill cycle starts.
A 2
Code Error
Item Possible Cause Remedy
Unit stops.
Operation