Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 User Manual download pdf (Page 23)

6. Alarm Signals

In the event of operation outside of normal parameters, the control board identies the

issue with an alarm signal. The alarm signal and temperature are displayed in 1-second

intervals.Forservicecorrections,see"III.A.AlarmSignals."

Alarm Signals

E1 High Temperature Alarm

E2 Low Temperature Alarm

E3 Defrost Alarm (cabinet only)

E4 Not Used

High Condenser Temperature Alarm

(clogged lter)

E8 Defrost Thermistor Malfunction Alarm

E9 Condenser Thermistor Malfunction Alarm

EA EEPROM Write Error Alarm

ED EEPROM Verication or Read Error Alarm

7. Control Board Check Procedure

Before replacing a control board that does not show a visible defect and that you

suspect is bad, always conduct the following check procedure. This procedure will help

you verify your diagnosis. Before you begin the diagnostics, verify proper supply voltage

and that the unit is correctly plugged in.

1)Movethepowerswitchtothe"ON"positionandtherailswitchtothe"NORMAL"

position. Both cabinet and rail temperatures should be displayed. The perimeter heater,

cabinet fans, and rail fans should be on.

2) If the temperature display is not on, check the 3A 125V fuse on the control board and

the control transformer secondary circuit. Secondary transformer output is 10V at

115V primary input. If the fuse and the secondary circuit voltage are good, but the

temperature display is off, the control board is bad and should be replaced.

3) If the temperature display is on and the components are not energizing, verify

12VDC to the corresponding relay. If there is no voltage to the component relay, the

control board is bad and should be replaced.

8. Control Board Replacement

1)Openthefrontpanel.Movethepowerswitchtothe"OFF"position,thenunplugthe

unit.

2) Remove the wire cover, then remove the control box cover.

3) Disconnect the control board wire connectors.

4) Remove the control board.

5) Install the new control board in the control box taking care not to damage it.

6) Connect the control board wire connectors to the new control board.

7) Replace the control box cover in its correct position.

8)Plugintheunit,thenmovethepowerswitchtothe"ON"positiontostarttheunit's

cooling process.

9) Check the setpoint and service menu settings and verify that they are set to the factory

defaults.See"II.D.4.ControlsandAdjustments"and"II.D.5.ServiceMenu."

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Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 User Manual Page 23