Hoshizaki JWE-620UA-6B service manual Defective Replace Control Board

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 float switch and the internal booster tank backup water level float 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 float 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.



Code

o 1

Error

Internal booster tank water level float switch and internal booster tank backup water level switch have remained closed for 1 minute.

Operation

Continues (internal

booster tank heater off).





















Item

Water Valve

Internal Booster Tank

Water Level Float

Switch

Internal Booster Tank

Backup Water Level

Float Switch

Possible Cause

Control relay contacts fused.

Defective.

Sticking.

Defective.

Sticking.

Remedy

Replace.

Replace.

Check and clean. See “III.D. Float Switch Check and Cleaning.”

Replace.

Check and clean. See “III.D. Float Switch Check and Cleaning.”

Defective.

Replace.

Control Board

Defective.

Replace.

Note: See “III.D. Float Switch Check and Cleaning.”

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