Cabinet Troubleshooting

The master control display and the row displays show error messages when there is a problem. The messages are shown in the matrix below along with possible causes and diagnostic tests.

Error Message

 

Cause

 

Tests

 

 

 

The master control board has lost

 

Turn the cabinet off and back on.

 

Call service row display

communication with the specified

 

Ensure there are no software

 

error

board.

 

incompatibilities.

 

Row number also displayed *

 

 

Inspect ribbon cable connections.

 

 

 

 

 

 

 

 

 

The master control board has lost

 

A display connection can produce

 

Call service distribution

communication with the top

 

this display. Before replacing a

 

board 0 error*

distribution board.

 

distribution board, remove power

 

 

 

 

 

from the unit and disconnect the

 

 

 

 

 

displays from the affected

 

 

 

The master control board has lost

 

distribution board. Return power

 

 

 

communication with the bottom

 

to the unit and, one at a time, plug

 

Call service distribution

distribution board.

 

in the displays, cycling power each

 

board 1 error*

 

 

time. If the problem is display‐

 

 

 

 

 

related it will go away with the

 

 

 

 

 

affected display disconnected.

 

 

 

 

 

 

 

 

 

 

 

Turn the cabinet off and on, which

 

 

 

 

 

can clear the problem if it is

 

 

 

Row’s top plate failed to reach

 

software related.

 

Call service rate of

 

Check top plate RTD output against

 

required temperature in prescribed

 

chart on page 2‐4.

 

rise top**

 

 

time window after startup or when

 

Enter service code (see page 2‐1)

 

 

 

 

 

 

 

switching between menus.

 

and switch top plate on and off to

 

 

 

 

 

ensure it is responding to cabinet

 

 

 

 

 

circuits.

 

 

 

 

 

 

 

 

 

 

 

Turn the cabinet off and on, which

 

 

 

 

 

can clear the problem if it is

 

 

 

Row’s bottom plate failed to reach

 

software related.

 

 

 

 

Check bottom plate RTD output

 

Call service rate of

required temperature in prescribed

 

against chart on page 2‐4.

 

rise bot **

time window after startup or when

 

Enter service code (see page 2‐1)

 

 

 

switching between menus.

 

and switch bottom plate on and off

 

 

 

 

 

to ensure it is responding to

 

 

 

 

 

cabinet circuits.

 

 

 

 

 

 

Call service top row temp

 

 

Compare plate temperature to

 

too high **

 

 

displayed temperature.

 

Call service bot row temp

 

 

Compare plate RTD resistance to

 

too high**

 

 

chart on page 2‐4.

 

Call service top row temp

 

 

Switch plate on/off with service

 

 

 

code to ensure it is responding to

 

too cool**

 

 

 

 

 

cabinet circuits.

 

Call service bot row temp

RTD sensor is producing a reading

 

 

 

With plate on and calling for heat,

 

too cool **

that is out of range. The problem can

 

 

 

check amp draw on leads between

 

Call service top sensor

be a failed RTD, heater or

 

 

 

distribution board and heater

 

error hi temp**

distribution board.

 

 

 

plate. Amp draw on a properly

 

Call service bot sensor

 

 

 

 

 

functioning plate should be 1.67.

 

error hi temp**

 

 

 

 

 

 

 

Call service top sensor

 

 

 

 

error low temp **

 

 

 

 

Call service bot sensor

 

 

 

 

error low temp**

 

 

 

 

* Shown on master control display. ** Shown on affected row display.

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Frymaster UHC-HD manual Cabinet Troubleshooting

UHC-HD specifications

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