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e) Internal Booster Tank Water Level Error 2 (Internal Booster Tank Water Level Float
Switch Open) (o2)
• If the internal booster tank water level fl oat switch is open and the internal booster tank
backup water level fl oat switch has remained closed for 1 minute, the internal booster tank
heaters de-energize, "o2" appears in the display, and the buzzer sounds.
• The error resets if the internal booster tank backup water level fl oat switch opens or when
the "ON/OFF" button is used to turn the unit off and then back on.
• See the chart below for possible causes and remedies.
Note: See “III.D. Float Switch Check and Cleaning.”
Internal booster tank water level float switch is
open and internal booster tank backup water
level switch has remained closed for 1 minute.
o 2
Code Error
Item Possible Cause Remedy
Continues (internal
booster tank heater off).
Operation
Open circuit. Repair or replace.
Internal Booster Tank
Water Level Float
Switch
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”
Defective. Replace.
Control Board
Connector not properly
connected.
Reconnect.
Defective. Replace.
Defective. Replace.
Internal Booster Tank
Backup Water Level
Float Switch
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”