trouble shooting
COMBITHERM® CT PROFORMANCE™ SERIES • STEP-BY-STEP PROCEDURES • MN-35948 • 54.
This section is provided for the assistance of qualified technicians only and is not intended for use by
untrained or unauthorized service personnel. If your Alto-Shaam
®
unit is not operating properly, check the
following before calling your Authorized Alto-Shaam Service Agent:
☛ Check that unit is receiving power. Circuit breaker turned on?
Do not attempt to repair or service the oven beyond this point. Contact Alto-Shaam for the nearest
authorized service agent. Repairs made by any other service agents without prior authorization by
Alto-Shaam will void the warranty on the unit.
When the oven malfunctions, an error code will appear in the display.
PRESS THE START ICON TO ACKNOWLEDGE THE ERROR.
When the oven error notification has been acknowledged, the Combitherm will attempt to return
to normal operation.
Error
Code
Error Call Out in Display Description of Error Possible Cause
E01
Low Water Boiler Upper water level probe B1 is
not satisfi ed within 5 minutes,
after water solenoid valve Y1
is activated.
— Water supply is shut off.
— Low water pressure.
— Boiler drain cap is missing.
— Boiler drain pump is defective.
— Drain pump elbow leaking.
— Water level probe has calcium build up.
— Double water solenoid valve is defective (Y1).
— Relay board, high voltage is defective.
E02
Control Temperature High Low voltage relay board
temperature higher than
176°F (80°C).
— Check wiring to all components listed below.
— Cooling fan on relay board assembly is
defective.
— Cooling fan on display board assembly is
defective.
— Main cooling fan is defective.
— Cooling fan on motor drive is defective.
E03
Fan Motor Error Fan motor does not spin after
60 seconds, detected by the
Hall Sensor.
Error 03 does not appear if
error E53 is detected fi rst.
— Check wiring to all components listed below.
— If LED on motor control fl ashes, see error codes
for motor control.
— Motor or fan wheel locked.
— Hall sensor does not detect motor rotation.
— Motor Thermo Temperature protection.
— Fan wheel damaged.
E04
Lower Fan Motor Error Lower Fan motor does
not spin after 60 seconds,
detected by the Hall Sensor.
Error 04 does not appear if
error E54 is detected fi rst.
— Check wiring to all components mentioned
below.
— If LED on motor control fl ashes, see error codes
for motor control.
— Motor or fan wheel locked.
— Hall sensor does not detect motor rotation.
— Motor Thermo Temperature protection.
— Fan wheel damaged.
E05
VFD Comm Failure When VFD does not respond
to a query on the CAN
interface.
— Loss of power to VFD.
— VFD malfunction.
— CAN cable disconnected.
— CAN address not correct on VFD.
E06
Lower VFD Comm Failure When VFD does not respond
to a query on the CAN
interface.
— Loss of power to VFD.
— VFD malfunction.
— CAN cable disconnected.
— CAN address not correct on VFD.
ERROR CODES
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