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Troubleshooting
Error Codes
ALWAYS check the circuit breaker is turned "ON" and your unit is receiving power BEFORE calling your Authorized
Alto-Shaam Service Agent.
This section is provided for the assistance of qualified and trained service technicians only and is not intended for use
by untrained or unauthorized service personnel. 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.
When the oven malfunctions, an error code will appear in the display.
Press the Start icon to acknowledge the error.
When the oven error noti cation has been acknowledged, the Combitherm will attempt to return to normal operation.
Error
Error Call Out in Display
Code
E01
Low Water Boiler
E02
Control Temperature High
E03
Fan Motor Error
E04
Lower Fan Motor Error
E05
VFD Comm Failure
72
MN-35947
•
NOTICE
Description of Error
Upper water level probe B1 is
not satisfied within 5 minutes,
a er water solenoid valve Y1 is
activated.
Low voltage relay board
temperature higher than
176°F (80°C).
Fan motor does not spin a er
60 seconds, detected by the Hall
Sensor.
Error 03 does not appear if error
E53 is detected first.
Lower Fan motor does not spin
a er 60 seconds, detected by the
Hall Sensor.
Error 04 does not appear if error
E54 is detected first.
When VFD does not respond to a
query on the CAN interface.
Rev 12
11/16
Combitherm® CT PROformance™ and CT Classic Series Installation Manual
•
•
•
Possible Cause(s)
— Water supply is shut o .
— 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.
— 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.
— Check wiring to all components listed below.
— If LED on motor control flashes, 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.
— Check wiring to all components mentioned below.
— If LED on motor control flashes, 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.
— Loss of power to VFD.
— VFD malfunction.
— CAN cable disconnected.
— CAN address not correct on VFD.
continued on next page
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