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e) Booster Tank Water Level Error 2 (Booster Tank Water Level Float Switch Open)
(o2)
• If the booster tank water level fl oat switch is open and the booster tank backup water level
fl oat switch has remained closed for 1 minute, the booster tank heaters de-energize, "o2"
appears in the display, and the buzzer sounds.
• The error resets if the 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.”
Booster tank water level float switch is open and
booster tank backup water level switch has
remained closed for 1 minute.
o 2
Code Error
Item Possible Cause Remedy
Unit stops
Operation
Open circuit. Repair or replace.
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.
Booster Tank Backup
Water Level Float
Switch
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”