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