Frymaster UHC-HD manual Cabinet Troubleshooting, Symptom, Possible Causes, Tests

Models: UHC-HD

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Cabinet Troubleshooting

Failure modes not accompanied by a master control display are shown below with possible causes and tests.

 

Symptom

 

 

 

Possible Causes

 

 

Tests

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No power to cord.

 

Check for line voltage at the switch

 

Unit fails to power

 

Blown 20 amp fuse.

 

and the transformer.

 

up; fans don’t run.

 

Circuit breaker open.

 

Reset circuit breaker.

 

 

 

 

 

 

 

 

Unit powers up and

 

Broken or improperly

 

Switch ribbon cable from functioning

 

fans run; a display

 

 

seated ribbon cable.

 

display to failed component to isolate

 

fails to light.

 

Defective display.

 

problem.

 

 

 

 

 

 

 

 

 

 

Unit powers up and

 

 

 

 

Check for 5VDC at communication

 

fans run; all

 

Failed power supply.

 

 

 

 

board and distribution boards.

 

displays fail to light.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ensure heater leads and power inputs

 

 

 

 

 

 

 

 

on the distribution boards are properly

 

 

 

 

 

 

 

 

seated.

 

 

 

 

 

 

 

 

Test for 208VAC input on distribution

 

 

 

 

Improper wiring on

 

board and 208VAC output from heater

 

 

 

 

 

leads to heater plate when the unit is

 

Rows heat

 

 

distribution board.

 

calling for heat.

 

 

Defective distribution

 

Switch power leads from properly

 

improperly or not at

 

 

board.

 

operating row to faulty row to isolate

 

all.

 

 

 

 

 

Defective heater.

 

problem.

 

 

 

 

 

 

 

 

 

Defective sensor.

 

Check resistance of RTD lead against

 

 

 

 

 

 

 

 

temperature chart. See Page 2-4.

 

 

 

 

 

 

 

 

Switch RTD lead from properly

 

 

 

 

 

 

 

 

operating row to faulty row to isolate

 

 

 

 

 

 

 

 

problem.

 

 

 

 

 

 

 

 

Test continuity of heater plate.

 

 

 

 

 

 

 

 

 

 

3-2

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Frymaster UHC-HD manual Cabinet Troubleshooting, Symptom, Possible Causes, Tests