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d) Internal Booster Tank Water Level Error 1 (Internal Booster Tank Water Level Float
Switch Closed) (o1)
• If both the internal booster tank water level fl oat switch and the internal booster tank backup
water level fl oat switch have remained closed for 1 minute, the internal booster tank heaters
de-energize, "o1" 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.”
Control Board
Defective. Replace.
Water Valve
Control relay contacts
fused.
Replace.
Defective. Replace.
Internal booster tank water level float switch and
internal booster tank backup water level switch
have remained closed for 1 minute.
o 1
Code Error
Item
Possible Cause
Remedy
Continues (internal
booster tank heater off).
Operation
Defective. Replace.
Internal Booster Tank
Water Level Float
Switch
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”
Defective. Replace.
Internal Booster Tank
Backup Water Level
Float Switch
Sticking.
Check and clean. See
“III.D. Float Switch
Check and Cleaning.”