Water Circuit; [A] Reservoir (Water Tank); [B] Float Switch; [C] Control Water Valve - Hoshizaki FM-481AGE-HC Service Manual

cap screw. The screw is provided with retaining and sealing functions, which may be
reduced by the load and vibration during a freeze cycle. Do not reuse a removed socket
head cap screw.

4. WATER CIRCUIT

[a] RESERVOIR (WATER TANK)

The Reservoir made of plastic maintains the water level necessary for ice production.

[b] FLOAT SWITCH

The Reservoir is provided with a plastic Float Switch to detect the water level. The floats
move up and down along with the water level and send ON/OFF signals to open/close the
Water Valve in order to maintain the proper water level.
If the proper water level cannot be resumed within a specific time after the Float Switch
sends an OFF signal, the icemaker will detect a low water condition and shut down. The
icemaker will automatically restart icemaking operation when the proper water level is
resumed.
If the Float Switch trips at the upper float level on startup and trips at the lower float level
(request for water supply) before the Compressor starts, the icemaker will display "E0" for a
water leak error and shut down.
If the Float Switch trips at the upper float level and does not trip at the lower float level, the
icemaker will display "E1" for a low ice production error and shut down.
If the Float Switch trips at both upper (fill) and lower (empty) float levels, the icemaker will
display "E2" for a switch contact error and shut down.
See "9. ERROR CODES" for details.

[c] CONTROL WATER VALVE

The Control Water Valve located above the Reservoir will open to supply water to the
Reservoir when the coil is energized. Despite the water pressure varying from 0.5 bar to 8
bar at the water supply inlet, the built-in flow controller maintains almost the same water
flow (24V AC).
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