MN-35947
•
Rev 22
•
10/22
•
Combitherm® CT PROformance™ and CT Classic Series Installation Manual
•
57
Troubleshooting – Error Codes
Error
Code
Error Call Out in Display
Description of Error
Possible Cause(s) and Remedies
E55
Vent Not Open
Applies to single-vent models and to
lower vent on dual-vent models.
60 seconds after the venting motor is
activated, the vent-motor monitoring
switch did not open.
— Vent valve monitoring switch has malfunctioned.
— Vent valve (motor) has malfunctioned.
E56
Vent 2 Not Open
Upper vent on dual-vent models
60 seconds after the venting motor is
activated, the vent motor monitoring
switch did not open.
— Vent valve monitoring switch has malfunctioned.
— Vent valve (motor) has malfunctioned.
E57
No Rinse Water
Flow switch for solenoid valve (Y4)
does not detect any water
fl
ow for a
minimum of 60 seconds.
— Water supply is shut off.
— Water pressure is low.
— Flow switch is dirty or has malfunctioned.
E88
Gas Ignition Failure
NOTE: If after 2 attempts to clear
this error, the error appears a
third time, remove the oven from
service and immediately contact
an Alto-Shaam authorized service
provider.
Burner has failed to ignite.
Refer to detailed procedure titled “No Combustion on a Call for Heat”
following these error codes.
E89
Upper Gas Ignition Failure
NOTE: If after 2 attempts to clear
this error, the error appears a
third time, remove the oven from
service and immediately contact
an Alto-Shaam authorized service
provider.
Applies to table-top models and
upper igniters on roll-in models.
Reset output from Ignition Module
is ON
— Gas supply is shut off.
— Gas supply is low.
— Hot surface ignitor has malfunctioned.
— Flame sensor has malfunctioned.
— Heat exchanger is plugged.
— Ignition control has malfunctioned.
— Gas valve has malfunctioned.
Refer to Troubleshooting
E90
Lower Gas Combustion Blower Not
at Speed
Applies only to roll-in models.
Speed is too slow.
— Power supply cable is not connected to combustion blower motor.
— Speed control cable is not connected to combustion blower motor.
— Combustion blower motor is blocked, rotation is impeded, or motor
has malfunctioned.
— Faulty control board.
E91
Upper Gas Blower Not at Speed
Table-top models or upper blowers
on roll-in models.
Speed is too slow.
— Power supply cable is not connected to combustion blower motor.
— Speed control cable is not connected to combustion blower motor.
— Combustion blower motor is blocked, rotation is impeded, or motor
has malfunctioned.
— Faulty control board.
E92
Communication Error
CB does not properly respond
No response from the Control Board
(CB) to the Interface Board (IB).
— Turn off oven. Disconnect power. Reconnect power. Turn oven on.
— Check CAN cable connections between CB and IB.
— CAN cable has malfunctioned.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E93
Interface Board (IB) and Control
Board (CB) are in different states
The IB is in a different running
state than the CB for more than 20
seconds.
— Turn off oven. Disconnect power. Reconnect power. Turn oven on.
— Check CAN cable connections between CB and IB.
— CAN cable has malfunctioned.
— Relay board, low voltage, connector defective.
— Display board connector defective.
E94
Communication Error,
TO Interface Board
No signal transfer for more than 20
seconds between the Interface Board
(IB) and the Control Board (CB).
— Turn off oven. Disconnect power. Reconnect power. Turn oven on.
— Check CAN cable connections.
— CAN cable defective.
— Relay board, low voltage, connector defective.
— Display board connector defective.
Error Codes
